Patent Application
20130096059
The present invention relates to a pharmaceutical composition for use in the treatment of a disease or condition, wherein said disease or condition is associated with (a) stenosis or/and obstruction located in the biliary tract, or/and (b) biliary dyskinesia, said composition comprising at least one GLP-1 agonist and optionally a pharmaceutically acceptable carrier, diluent or/and auxiliary substance.
The biliary tract (also termed biliary system or biliary duct system) directs bile from the liver into the duodenum. The biliary tract includes the ductus hepaticus (hepatic duct, common hepatic duct), ductus cysticus (cystic duct), the gall bladder, the ductus choledochus (common bile duct), ductus hepatopancreaticus, papilla of Vater or/and in the sphincter of Oddi. The common hepatic duct leads to the common bile duct. The common bile duct is formed by junction of the common hepatic duct and the cystic duct. The cystic duct joins the gall bladder to the hepatic duct/common bile duct. The ductus hepatopancreaticus is formed by junction of the common bile duct and the major pancreatic duct, leading to the papilla of Vater (also termed papillar vateri or papilla duodeni major) located in the duodenum wall. The papilla of Vater includes the sphincter of Oddi. The sphincter of Oddi consists of smooth muscle fibers surrounding a variable length of the ductus hepatopancreaticus.
The walls of the biliary tract comprise smooth muscle, and the inner surface is covered by columnar epithelium.
The contraction of the smooth muscle in the biliary tract (in particular in the gall bladder) can be induced by cholecystokinin (CCK). CCK is produced in the mucosa of the small intestine. CCK reaches the gall bladder via the circulation. Release of CCK can be induced by a fatty meal. By contraction of the gall bladder, bile is released into the duodenum, where it helps emulsifying fats. Another function of CCK is the induction of release of digestive enzymes in the stomach and in the pancreas.
Stenosis or/and obstruction in the biliary tract can lead to an impaired flow of bile, resulting in a condition associated with pain. Subsequently, inflammatory processes are perpetuating the pathophysiological condition. Stenotic processes or/and obstruction within the biliary tract, for example by inwards growth of surrounding tissue (by cancer or/and inflammatory processes), may cause an increase of intraduct volume by accumulation of bile, combined with dilation of the duct wall. This increase of volume, which may be combined with dilation of duct wall, may result in severe acute or chronic pain. The acute pain is sometimes referred to as a gallbladder “attack” because of its sudden onset. Treatment of such pain includes treatment with opioid analgesics or by surgical removal of the stenosis or/and obstruction. Such surgery may be a “radical” surgery, i.e. complete removal of the affected tissue, such as the gall bladder.
Obstruction can be caused by concrements, for example cholesterol concrements, bilirubin and calcium salt concrements, or “mixed” stones containing both cholesterol and bilirubin. These concrements are also called “gallstones”. The presence of a concrement in a biliary duct is called choledocholithiasis. The presence of a concrement in the gall bladder is called cholecystolithiasis.
A stenosis of the biliary tract can also be originated by cancer or other processes causing growth of target tissue like exsudative inflammatory pocesses.
Glucagon-like peptide 1 (GLP-1) is an endocrine hormone which increases the insulin response following oral intake of glucose or fat. GLP-1 generally regulates the concentrations of glucagons, slows down gastric emptying, stimulates the biosynthesis of (pro-)insulin, increases the sensitivity toward insulin, and stimulates the insulin-independent biosynthesis of glycogen (Hoist (1999), Curr. Med. Chem 6: 1005, Nauck et al. (1997) Exp Clin Endocrinol Diabetes 105: 187, Lopez-Delgado et al. (1998) Endocrinology 139:2811).
Human GLP-1 has 37 amino acid residues (Heinrich et al., Endocrinol. 115:2176. (1984), Uttenthal et al., J Clin Endocrinol Metabol (1985) 61:472). Active fragments of GLP-1 include GLP-1 (7-36) amide and GLP-1 (7-37).
Exendins are a group of peptides which are able to lower blood glucose concentrations. Exendins have a certain similarity in sequence to GLP-1(7-36) (53%, Goke et al. J. Biol Chem 268, 19650-55). Exendin-3 and exendin-4 stimulate an increase in cellular cAMP production in acinar cells of the guinea pig pancreas by interaction with exendin receptors (Raufman, 1996, Reg. Peptides 61: 1-18). In contrast to exendin-4, exendin-3 produces an increase in amylase release in acinar cells of the pancreas.
Exendin-3, exendin-4, and exendin agonists have been proposed for the treatment of diabetes mellitus and the prevention of hyperglycemia; they reduce gastric motility and gastric emptying (U.S. Pat. No. 5,424,286 and WO98/05351).
Exendin analogues may be characterized by amino acid replacements and/or C-terminal truncation of the natural exendin-4 sequence. Exendin analogues of this kind are described in WO 99/07404, WO 99/25727, WO 99/25728. Exendin-4 analogues include lixisenatide (also termed AVE0010, desPro36-exendin-4-Lys6-NH2 or H-desPro36-exendin-4-Lys6-N H2).
WO 2007/028394 discloses the use of a GLP-1 molecule for the treatment of biliary dyskinesia and/or biliary pain/discomfort. According to WO 2007/028394, biliary dyskinesia may be an increased motility of an area of the biliary tract, or a decreased motility of an area of the biliary tract. The GLP-1 molecule is considered as prokinetic agent. According to WO 2007/028394, the GLP-1 molecule may be administered in combination with one or more other excitatory factor(s) capable of inducing bile flow and/or treating biliary tract motility disorders. Alternatively, the GLP-1 molecule may be administered in combination with one or more inhibitory factor(s) capable of reducing bile flow. No experimental evidence is presented in WO 2007/028394 that a GLP-1 molecule would affect gallbladder physiology. GLP-1 is not known to have any effect on the biliary tract.
Gallbladder motility can be expressed by gallbladder ejection fraction and can be assessed by cholescintigraphy. Cholescintigraphy is a nuclear imaging procedure to evaluate the function of the gallbladder. For example, a derivative of iminodiacetic acid labelled with 99mTechnetium is injected i.v., then allowed to circulate to the liver, where it is excreted into the biliary system and stored by the gallbladder. Cholescintigraphy is used for diagnosis of gallbladder dyskinesia, which involves gallbladder dysfunction. Cases with a gall bladder ejection fraction (GBEF) below 40% are considered to be indicated for cholecystectomy (Behar J. et al., Gastroenterology 2006 130:1498-1509).
Relaxation and contraction of the gallbladder is mediated by smooth muscle cells and represent the morphological correlate of the dynamic measurements via the 99mtechnetium cholescintigraphy method.
The example of the present invention refers to a randomized, double-blind, placebo-controlled, two-sequence, two-treatment cross-over study assessing the effect of a single subcutaneous injection of 20 μg lixisenatide on gallbladder motility in healthy male and female subjects. Gallbladder motility has been analysed by cholescintigraphy. Cholecystokinin (CCK-8) has been administrated 60 min after administration of a single dose of placebo or 20 μg lixisenatide and followed immediately by a single dose of 99mTc mebrofenin (a 99mTc-labeled iminodiacetic acid derivative). The procedure can be summarized as follows. By placing a radiation-sensitive camera over the subject's abdomen, a “picture” of the liver, bile ducts, and gallbladder can be obtained that corresponds to where the radioactive bile has migrated. After injection of lixisenatide or placebo and 99mTc injection, hepatic frame images were obtained at 1 frame/min for 60 min. After gallbladder visualization at 60 min, 0.02 μg/kg CCK-8 was administered via constant infusion pump for 60 min. Image acquisition was continued for at least an additional 60 min following CCK-8 infusion.
In the placebo group, CCK-8 induced a decline of counts recorded from the gallbladder, indicating a release of bile from the gallbladder via bile ducts into the duodenum.
Surprisingly, by subcutaneous administration of a single dose of 20 μg lixisenatide in healthy subjects, this effect of CCK-8 is largely reduced (see exemplary filling and emptying curves in
The origin of the lixisenatide effect upon GBEF, as described herein, is not known. Without wishing to be bound by theory, reduction of CCK-induced gallbladder emptying under lixisenatide can be explained by lixisenatide-induced smooth muscle relaxation of the gallbladder. Lixisenatide thus provides a spasmolytic effect in the gallbladder. One can conclude that lixisenatide will exhibit a smooth muscle relaxation effect in the biliary system. Based upon the lixisenatide effect upon GBEF disclosed herein, it is expected that the smooth muscle cells in the biliary system may become relaxed by administration of lixisenatide or a GLP-1 agonist. Thus, GLP-1 agonists including lixisenatide may provide a spasmolytic or antispasmodic effect in the biliary system.
A stenosis or/and obstruction in the biliary tract may result in a spasm, which often is painful. The spasmolytic effects of GLP-1 agonists propose the therapeutic use of GLP-1 agonists in the treatment of diseases associated with stenotic or obstructive processes. GLP-1 agonists, such as lixisenatide, can exhibit a therapeutic effect on stenotic or obstructive processes in the biliary tract. Relaxation of the smooth muscle results in an increase of duct lumen, thus improving the flow of bile if a stenosis or an obstruction is present. By the spasmolytic activity, the GLP-1 agonists becomes suitable for the treatment of pain associated with stenosis or/and obstruction in the biliary system.
Therefore, a first aspect of the present invention refers to a pharmaceutical composition for use in the treatment of a disease or condition, wherein said disease or condition is associated with (a) stenosis or/and obstruction located in the biliary tract, or/and (b) biliary dyskinesia, said composition comprising at least one GLP-1 agonist and optionally a pharmaceutically acceptable carrier, diluent or/and auxiliary substance.
In the present invention, “biliary tract” includes, but is not limited to, the ductus hepaticus, gall bladder, ductus cysticus, ductus choledochus, ductus hepatopancreaticus, papilla of Vater or/and sphincter of Oddi.
As used herein, “ductus hepaticus” or “hepatic duct” includes the right hepatic duct and the left hepatic duct, and the common hepatic duct. The common hepatic duct is formed by the convergence of the right hepatic duct (draining bile from the right functional lobe of the liver) and the left hepatic duct (draining bile from the left functional lobe of the liver). In particular, “ductus hepaticus” or “hepatic duct” refers to those parts of the hepatic duct located outside the liver tissue.
The stenosis or/and obstruction may be located in the ductus hepaticus, in the gall bladder, in the ductus cysticus, in the ductus choledochus, in the ductus hepatopancreaticus, in the papilla of Vater or/and in the sphincter of Oddi.
The obstruction may be caused by a concrement located in the biliary tract, by lithiasis or/and by biliary sludge. In particular, lithiasis includes choledocholithiasis and cholecystolithiasis. The concrement may be a cholesterol concrement, a pigment concrement, or a concrement containing cholesterol and pigment (“mixed” concrement).
In the present invention, a cholesterol concrement or cholesterol stone may comprise at least 80% by weight cholesterol, or at least 70% by weight cholesterol.
In the present invention, a pigment concrement or pigment stone may comprise bilirubin or/and calcium salts, which calcium salts are found in bile (for example calcium bicarbonate). Pigment concrements can comprise cholesterol in an amount of at the maximum 20% by weight, or at the maximum 30% by weight.
In the present invention, a mixed concrement or mixed stone can contain 20 to 80% by weight cholesterol or 30 to 70% by weight cholesterol. The mixed concrement may contain calcium carbonate, palmitate phosphate, bilirubin, or/and other bile pigments.
“Biliary sludge”, as used herein, refers to a mixture of microscopic particulate matter in bile that occurs when particles of material precipitate from bile. The particulate matter may comprise the same components as concrements, as described herein. The most common particulate components of biliary sludge are cholesterol crystals and calcium salts.
A number of diseases are associated with pain and/or discomfort and/or dyskinesia in the biliary tract (or “biliary dyskinesia”). “Dyskinesia” in the biliary tract is herein defined as abnormal motility of any part of the biliary tract, such as e.g. abnormal motility in the gall bladder, bile duct wall, cystic duct, sphincter of Oddi or/and a sphincter in the gall bladder. In particular, the motility abnormality in the biliary tract causes pain and/or discomfort in the patient. This includes but is not restricted to gallbladder dysfunction, dysfunction of the biliary tract and dysfunction of the sphincter of Oddi. Biliary dysfunction may e.g. be increased motility of an area of the biliary tract, or decreased motility of an area of the biliary tract, or alternatively disordered control of motility, such as e.g. with spasms in the biliary tract.
In the present invention, gallbladder dysfunction may be any motility abnormality of the gall bladder including abnormal gallbladder emptying that causes biliary-type pain or discomfort.
In the present invention, sphincter of Oddi dysfunction is the term used to define motility abnormalities of the sphincter of Oddi.
The disease associated with stenosis or/and obstruction of the biliary tract may be pain or discomfort and/or dyskinesia in the biliary tract (or “biliary dyskinesia”). The disease associated with stenosis or/and obstruction of the biliary tract may in particular be a disease disclosed in WO 2007/028394, the disclosure of which is incorporated herein by reference. The disease may be biliary dyskinesia and/or pain or discomfort originating from the biliary tract associated with at least one of pathological condition selected from inflammatory bowel disease, chronic acalculous cholecystitis, alcalculous gallbladder disease, cystic duct syndrome, postcholecystectomy syndrome, treatment with gall-bladder motility inhibiting drugs, parenteral nutrition, coeliac disease, Down's syndrome, Beta-thalassemia, gastric surgery, very low calorie dieting, extracorporeal shockwave lithotripsy, somatostatin-producing tumor, sphincter of Oddi stenosis, sphincter of Oddi dyskinesia, glandular hyperplasia, muscle hyperplasia, muscle hypertrophy, muscle fibrosis, sphincter of Oddi muscular incoordination, sphincter of Oddi muscular hypertonicity, sphincter of Oddi muscular spasm, hyperthyroidism, treatment with a compound known to impair the passage of bile (such as somatostatin, octreotide, sandostatin LAR, anticholinergc drugs, nitric oxide, L-Arginine, nitric oxide donors, calcium channel antagonists), biliary tract obstruction (partial or complete), biliary tract obstruction (partial or complete) caused by choledocholithiasis, cholangiocarcinoma, primary sclerosing cholangitis (PSC), tumors of the ampulla of Vater, other biliary tumour types (including papillomas, adenomas and cystadenomas), Mirizzi's syndrome, AIDS cholangiopathy, infections (including Cryptosporidia, cytomegalovirus, microsporidium and Cyclospora), parasite infections (such as Strongyloides, Ascaris, and liver flukes such as Clonorchis sinensis and Fasciola hepatica), obstructive lesion in the large ducts of the biliary tree outside the liver, primary biliary cirrhosis, primary sclerosing cholangitis, infantile obstructive cholangiopathy (e.g. extrahepatic biliary atresia), damage to the small intraheptic bile ducts by e.g. drugs (such as benoxaprofen, chlorpromazine, haloperidol, imipramine), biliary sludge, and cholestasis.
In the present invention, a typical nitric oxide donor may be glyceryl trinitrate or nitroprusside. A calcium channel antagonist may be selected from nifedipine, verapamil, loperamide, progesterone, trimebutine maleate, loperamide, and ondansetron.
The disease associated with stenosis or/and obstruction of the biliary tract may be biliary dyskinesia and/or pain or discomfort originating from the biliary tract associated with gallstones. The pain or discomfort and/or dyskinesia may be present in any part(s) of said individual's biliary tract. The disease associated with stenosis or/and obstruction may be pain and/or discomfort and/or dyskinesia of one or more of the following: gallbladder, sphincter of Oddi, bile duct wall and/or cystic duct.
The disease associated with stenosis or/and obstruction of the biliary tract may be a pathological condition causing gallbladder dyskinesia and/or pain and/or discomfort, wherein the pathological condition is preferably selected from biliary dyskinesia, gallstones, inflammatory bowel disease, chronic acalculous cholecystitis, alcalculous gallbladder disease, cystic duct syndrome, and postcholecystectomy syndrome.
The disease associated with stenosis or/and obstruction of the biliary tract may be a pathological condition associated with causing gallbladder dyskinesia and/or pain and/or discomfort, wherein the pathological condition is preferably selected from treatment with gall-bladder motility inhibiting drugs, parenteral nutrition, coeliac disease, Down's syndrome, Beta-thalassemia, gastric surgery, very low calorie dieting, extracorporeal shockwave lithotripsy, and somatostatin-producing tumour.
The disease associated with stenosis or/and obstruction of the biliary tract may be a pathological condition causing sphincter of Oddi dyskinesia and/or pain and/or discomfort. Thus, for example, said individual may be suffering from, “sphincter of Oddi stenosis” (caused e.g. by glandular hyperplasia, muscle hyperplasia, muscle hypertrophy or muscle fibrosis), and/or “sphincter of Oddi dyskinesia” (caused e.g. by muscular incoordination, muscular hypertonicity or spasm).
The disease associated with stenosis or/and obstruction of the biliary tract may be a sphincter of Oddi dyskinesia, wherein the individual suffering therefrom has an abnormal sphincter of Oddi contraction of seven contractions per minute or more. Furthermore, the sphincter of Oddi dyskinesia and/or pain and/or discomfort may involve abnormalities in e.g. the biliary sphincter, pancreatic sphincter, or both. The sphincter of Oddi dyskinesia may be associated with hyperthyroidism.
The disease associated with stenosis or/and obstruction of the biliary tract may be a pathological condition caused by treatment with an inhibitory factor (such as a drug) known to inhibit biliary tract motility and/or reduce the basal tone of the biliary system. Said inhibitory factor may be, but is not restricted to, any of the following factors: somatostatin, octreotide, sandostatin LAR, anticholinergc drugs, nitric oxide, L-arginine, nitric oxide donors, and calcium channel antagonists.
Other biliary tract disorders causing biliary dyskinesia and/or pain and/or discomfort that may be treated according to the present invention may include, but are not restricted to: biliary tract obstruction (partial or complete), biliary tract obstruction (partial or complete) caused by choledocholithiasis, cholangiocarcinoma, primary sclerosing cholangitis (PSC), tumors of the ampulla of Vater, other biliary tumour types (including papillomas, adenomas and cystadenomas), Mirizzi's syndrome, AIDS cholangiopathy, infections (including Cryptosporidia, cytomegalovirus, microsporidium and Cyclospora), parasite infections (such as Strongyloides, Ascaris, and liver flukes such as Clonorchis sinensis and Fasciola hepatica), obstructive lesion in the large ducts of the biliary tree outside the liver, primary biliary cirrhosis, primary sclerosing cholangitis, infantile obstructive cholangiopathy—e.g. extrahepatic biliary atresia, damage to the small intraheptic bile ducts (by e.g. drugs such as benoxaprofen, chlorpromazine, haloperidol, imipramine etc.), biliary sludge, and cholestasis.
Pregnancy may be associated with stenosis or/and obstruction of the biliary tract.
In particular, the disease associated with stenosis or/and obstruction located in the biliary tract may be lithiasis, choledocholithiasis, cholecystolithiasis, or/and inflammation associated with concrement formation in the biliary tract.
The disease or condition associated with stenosis or/and obstruction located in the biliary tract may be cancer. In particular, the cancer causes a stenosis in the biliary tract.
The cancer may be located in the ductus hepaticus, in the gall bladder, in the ductus cysticus, in the ductus choledochus, in the ductus hepatopancreaticus, in the papilla of Vater or/and in the sphincter of Oddi. In particular, the cancer includes a tumor. The cancer may include a metastasis, for example a metastasis derived from a metastasizing cancer in another organ.
The stenosis or/and obstruction may cause pain.
The treatment may be a palliative treatment. Palliative treatment is indicated in patients suffering from cancer, in particular inoperable cancer, cancer in a terminal state, cancer which does not respond to anti-cancer treatment (for example by radiation or/and chemotherapy), the presence of metastases derived from a metastasizing cancer in another organ, wherein a metastatis causes a stenosis or/and obstruction in the biliary tract, and wherein the cancer is in particular painful, in particular by formation of the stenosis or/and obstruction. More particular, the cancer forms a stenosis.
The treatment, in particular the palliative treatment may be continued for at least one month, at least two months, at least three months, at least four months, or at least six months.
Yet another aspect of the present invention is a pharmaceutical composition for use in a palliative treatment, said composition comprising at least one GLP-1 agonist, and optionally a pharmaceutically acceptable carrier, diluent or/and auxiliary substance. The palliative treatment is a palliative treatment as described herein. In particular, the palliative treatment includes the treatment of pain caused by a stenosis or/and obstruction in the biliary tract. More particular, the palliative treatment includes the treatment of pain caused by cancer originating from stenosis or/and obstruction of the biliary tract. The composition is a composition as described herein.
A further aspect of the present invention is a pharmaceutical composition for use in the treatment of pain, said composition comprising at least one GLP-1 agonist, and optionally a pharmaceutically acceptable carrier, diluent or/and auxiliary substance. The pain is a pain as described herein. In particular, the pain may be associated with (a) stenosis or/and obstruction in the biliary tract, or/and (b) biliary dyskinesia. The treatment of pain may be a palliative treatment, in particular a palliative treatment as described herein. The composition is a composition as described herein.
Another aspect of the present invention is a method of treatment of a disease or condition associated with (a) stenosis or/and obstruction in the biliary tract, or/and (b) biliary dyskinesia, said method comprising administrating to a subject in need thereof a pharmaceutical composition comprising at least one GLP-1 agonist, and optionally a pharmaceutically acceptable carrier, diluent or/and auxiliary substance. In the method of the present invention, the disease or condition may be any disease described herein, in particular a disease associated with (a) stenosis or/and obstruction in the biliary tract, or/and (b) biliary dyskinesia, as described herein. The composition is a composition as described herein.
The patient or/and individual to be treated by the pharmaceutical composition or/and method as described herein may be a mammal, including humans and non-human mammals. A preferred patient or/and individual is a human.
In particular, the patient does not suffer from diabetes mellitus, such as type 1 or type 2 diabetes mellitus.
In particular, the patient is not obese. More particular, the patient's body mass index is below 30 kg/m2 or below 27 kg/m2.
In particular, the patient does not suffer from a CNS disorder, such as Alzheimer disease or Parkinson's disease.
A further aspect of the present invention is the use of a GLP-1 agonist for the manufacture of a medicament for the treatment of a disease or condition associated with (a) stenosis or/and obstruction in the biliary tract, or/and (b) biliary dyskinesia, said medicament comprising at least one GLP-1 agonist and optionally a pharmaceutically acceptable carrier, diluent or/and auxiliary substance. In the use of the present invention, the disease or condition may be any disease as described herein, in particular a disease associated with (a) stenosis or/and obstruction in the biliary tract, or/and (b) biliary dyskinesia, as described herein. The GLP-1 agonist may be a GLP-1 agonist as described herein. The medicament may be a composition as described herein.
In the present invention, “antispasmodic activity” or “spasmolytic activity” of a GLP-1 agonist means that the tone of the smooth muscle, in particular in the bile system, is reduced by administration of a GLP-1 agonist. In particular, lixisenatide provides an antispasmodic or spasmolytic activity.
In the present invention, the at least one GLP-1 agonist can be one, two, three, four, five or more GLP-1 agonists. In particular the at least one GLP-1 agonist can be one GLP-1 agonist.
In the present invention the term “GLP-1 agonist” includes GLP-1, analogues and derivatives thereof, exendin-3, analogues and derivatives thereof, and exendin-4, analogues and derivatives thereof. Also included are substances which exhibit the biological activity of GLP-1. “GLP-1 agonist” is also termed “GLP-1 receptor agonist”.
The pharmaceutical composition of the invention can comprise one or more selected independently of one another from the group consisting of glucagon-like peptide-1 (GLP-1), analogues and derivatives of GLP-1, exendin-3, analogues and derivatives of exendin-3, exendin-4, analogues and derivatives of exendin-4,
GLP-1, exendin-3 or/and exendin-4, as used herein, include pharmacologically acceptable salts of GLP-1, exendin-3 or/and exendin-4.
It is preferred that the GLP-1 agonist is lixisenatide or/and a pharmaceutically acceptable salt thereof.
It is also preferred that the GLP-1 agonist is liraglutide or/and a pharmaceutically acceptable salt thereof.
GLP-1 analogues and derivatives are described in WO 98/08871, for example; exendin-3, analogues and derivatives of exendin-3, and exendin-4 and analogues and derivatives of exendin-4 can be found in WO 01/04156, WO 98/30231, U.S. Pat. No. 5,424,286, in EP application 99 610 043.4, in WO 2004/005342 and WO 04/035623. These documents are included herein by reference. The exendin-3 and exendin-4 described in these documents, and the analogues and derivatives thereof that are described there, can be used in the compositions of the present invention as GLP-1 agonists. It is also possible to use any desired combination of the exendin-3 and exendin-4 described in these documents, and the analogues and derivatives described therein, as GLP-1 agonists.
The at least one GLP-1 agonist is preferably independently selected from the group consisting of exendin-4, analogues and derivatives of exendin-4, and pharmacologically acceptable salts thereof.
A further preferred GLP-1 agonist is an analogue of exendin-4 selected from a group consisting of:
A further preferred GLP-1 agonist is an analogue of exendin-4 selected from a group consisting of:
A further preferred GLP-1 agonist is an analogue of exendin-4 selected from a group as described in the paragraph above in which the peptide -(Lys)6-NH2 has been attached at the C-termini of the analogues of exendin-4.
A further preferred GLP-1 agonist is an analogue of exendin-4 selected from a group consisting of:
A further preferred GLP-1 agonist is selected from a group consisting of Arg34,Lys26(Nε(γ-glutamyl(Nα-hexadecanoyl)))GLP-1(7-37) [liraglutide] and pharmacologically tolerable salts thereof.
A further preferred GLP-1 agonist is Lixisenatide. Lixisenatide has the sequence of H-desPro36-exendin-4-Lys6-NH2 (desPro36-exendin-4-Lys6-NH2, AVE0010). This substance is published as SEQ ID No: 93 in WO 01/04156. Lixisenatide is a derivative of Exendin-4:
Preference is also given to pharmacologically tolerable salts of Lixisenatide.
The term “at least one GLP-1 agonist” includes combinations of the herein-described GLP-1 agonists which are used in the compositions of the invention, examples being any desired combinations of two or more GLP-1 agonists selected from the GLP-1 agonists described herein.
The at least one GLP-1 agonist is further preferably independently selected from exendin-4, H-desPro36-exendin-4-Lys6-N H2, and Arg34,Lys26(Nε-(γ-glutamyl(Nα-hexadecanoyl)))GLP-1 (7-37) [Iiraglutide], and pharmacologically acceptable salts thereof.
The compositions of the invention may contain the GLP-1 agonist in an amount of 10 μg/ml to 20 mg/ml, preferably 25 μg/ml to 15 mg/ml. For the acidic to neutrally dissolved GLP-1 agonists the figures are preferably 20 μg/ml to 300 μg/ml, and for the neutral to basic agonists they are preferably 500 μg/ml to 10 mg/ml. For exendin-4 analogues, 20 μg/ml to 150 μg/ml are preferred.
In the present invention, the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and the pharmaceutically acceptable salt thereof, may be administered to a subject in need thereof, in an amount sufficient to induce a therapeutic effect.
In the present invention, the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and the pharmaceutically acceptable salt thereof, may be formulated with suitable pharmaceutically acceptable carriers, adjuvants, or/and auxiliary substances.
The at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may be administered parenterally, e.g. by injection (such as by intramuscular or by subcutaneous injection). Suitable injection devices, for instance the so-called “pens” comprising a cartridge comprising the active ingredient, and an injection needle, are known. The at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may be administered in a suitable amount, for instance in an amount in the range of 10 to 15 μg per dose or 15 to 20 μg per dose.
In the present invention, the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may be administered in a daily dose in the range of 10 to 20 μg, in the range of 10 to 15 μg, or in the range of 15 to 20 μg. The at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may be administered by one injection per day.
In the present invention, the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may be provided in a liquid composition. The skilled person knows liquid compositions of Lixisenatide suitable for parenteral administration. A liquid composition of the present invention may have an acidic or a physiologic pH. An acidic pH preferably is in the range of pH 1-6.8, pH 3.5-6.8, or pH 3.5-5. A physiologic pH preferably is in the range of pH 2.5-8.5, pH 4.0-8.5, or pH 6.0-8.5. The pH may be adjusted by a pharmaceutically acceptable diluted acid (typically HCl) or pharmaceutically acceptable diluted base (typically NaOH).
The liquid composition comprising the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may comprise a suitable preservative. A suitable preservative may be selected from phenol, m-cresol, benzyl alcohol and p-hydroxybenzoic acid ester. A preferred preservative is m-cresol.
The liquid composition comprising the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-NH2 or/and a pharmaceutically acceptable salt thereof, may comprise a tonicity agent. A suitable tonicity agent may be selected from glycerol, lactose, sorbitol, mannitol, glucose, NaCl, calcium or magnesium containing compounds such as CaCl2. The concentration of glycerol, lactose, sorbitol, mannitol and glucose may be in the range of 100-250 mM. The concentration of NaCl may be up to 150 mM. A preferred tonicity agent is glycerol.
The liquid composition comprising the at least one GLP-1 agonist, in particular desPro36Exendin-4(1-39)-Lys6-N H2 or/and a pharmaceutically acceptable salt thereof, may comprise methionine from 0.5 μg/mL to 20 μg/mL, preferably from 1 μg /ml to 5 μg/ml. Preferably, the liquid composition comprises L-methionine.
The invention is further illustrated by the following figures and example.
The example of the present invention refers to a randomized, double-blind, placebo-controlled, two-sequence, two-treatment cross-over study assessing the effect of a single subcutaneous injection of 20 μg lixisenatide on gallbladder motility in healthy male and female subjects. Gallbladder motility has been analysed by cholescintigraphy. Cholecystokinin (CCK-8) has been administrated 60 min after administration of a single dose of placebo or 20 gg lixisenatide and followed immediately by a single dose of 99mTc mebrofenin (a 99mTc-labeled iminodiacetic acid derivative). The procedure can be summarized as follows. By placing a radiation-sensitive camera over the subject's abdomen, a “picture” of the liver, bile ducts, and gallbladder can be obtained that corresponds to where the radioactive bile has migrated. After injection of lixisenatide or placebo and 99mTc injection, hepatic frame images were obtained at 1 frame/min for 60 min. After gallbladder visualization at 60 min, 0.02 μg/kg CCK-8 was administered via constant infusion pump for 60 min. Image acquisition was continued for at least an additional 60 min following CCK-8 infusion.
In the placebo group, CCK-8 induced a decline of 99mTc counts recorded from the gallbladder, indicating a release of bile from the gallbladder via bile ducts into the duodenum. Surprisingly, by subcutaneous administration of a single dose of 20 gg lixisenatide in healthy subjects, this effect of CCK-8 is largely reduced (see exemplary filling and emptying curves in
Primary Objective: To assess the effect of 20 pg lixisenatide on gallbladder (GB) emptying expressed as GB ejection fraction (GBEF) at 60 minutes induced by a continuous infusion of 0.02 μg/kg·h cholecystokinin (CCK8).
Secondary Objectives: To assess GBEF at 30 minutes. To assess the pharmacokinetic profile of a single subcutaneous injection of 20 lixisenatide
Single-center, double-blind, randomized, placebo-controlled, single-dose, 2period, 2treatment, 2sequence, crossover study
Planned: 24 subjects (20 evaluable subjects)
Randomized: 24
Treated: 24
Pharmacodynamic: 24
Safety: 24
Pharmacokinetics: 24
Male and female subjects aged 35 to 65 years with a body mass index between 18.0 and 35.0 kg/m2; female subjects postmenopausal or surgically sterile for at least 3 months prior to the time of screening. Subjects with GB and liver abnormalities detected by ultrasonography were excluded.
Lixisenatide
Dose: 20 μg (in 200 μL sterile aqueous solution)
Administration: subcutaneous injection using a pen-type injector (OptiClik®)
Batch number: FRA01282/40C008/C1005517
Duration of treatment: 1 day each in treatment Period 1 and 2
Duration of observation: 7 to 42 days (ie, from informed consent to end-of-study evaluation)
Placebo
Dose: 200 μL sterile aqueous solution
Administration: subcutaneous injection using a pen-type injector (OptiClik)
Batch number FRA01419/ 40C006/C1005518
Technetium99m (99mTc) mebrofenin/Cholediam®
Dose: ≦60 MBq 99mTc mebrofenin
Administration: intravenous injection
Batch number: FRA01419/ 40C006/C1005518
Cholecystokinin8 (CCK8)
Dose: 0.02 μg/kg Kinevac® (sincalide)
Administration: infusion for 60 minutes
Batch number: C1008567
Pharmacodynamic:
Cholescintigraphy: GB emptying expressed as GBEF. which is the percentage change of net GB counts after CCK8 administration.
Primary endpoint is the GBEF at 60 minutes induced by a continuous infusion of 0.02 μg/kg cholecystokinin8 (CCK8).
Secondary endpoint is the GBEF at 30 minutes
Safety: Adverse events, vital signs, electrocardiogram (ECG, automatic reading), standard clinical laboratory assessments (biochemistry and hematology)
Pharmacokinetics: Lixisenatide plasma concentration, pharmacokinetic parameters (Cmax, Tmax, AUClast, AUCt1-t2, AUC1/2Z)
To determine plasma concentrations of lixisenatide, blood was collected predose. and 0.5, 1, 1.5, 2, 3, 4, 6, 8, 10, and 12 hours after injection of lixisenatide.
The primary endpoint GBEF at 60 minutes, was analyzed using a linear mixed effects model Differences between treatment groups and 95% confidence intervals (95% CI) were estimated within the framework of the linear mixed effects model. Noninferiority was demonstrated if the upper limit of the 2-sided 95% confidence interval for the difference between the 2 treatment groups (placebo minus lixisenatide) was less than 0.20 or 20% (absolute difference).
For the secondary endpoint GBEF at 30 minutes, differences between treatment groups and 95% confidence intervals were estimated within the framework of the same linear mixed effects model as above.
Within-subject between-subject, and total standard deviations for GBEF at 60 minutes and at 30 minutes were estimated, with 90% CIs, by equating observed and expected means squares within a linear mixed effects model framework.
Descriptive statistics and summary and individual plots are also provided.
Lixisenatide pharmacokinetics were summarized using descriptive statistics.
The safely analysis was based on review of individual values (clinically significant abnormalities) and descriptive statistics by treatment. For adverse events, frequencies of treatment-emergent adverse events (TEAEs) classified by the Medical Dictionary for Regulatory Activities (MedDRA version 13.0) system organ class and preferred term were tabulated by treatment. All adverse events were listed.
Lixisenatide pharmacokinetics were summarized using descriptive statistics.
The safety analysis was based on review of individual values (clinically significant abnormalities) and descriptive statistics by treatment For adverse events, frequencies of TEAEs classified by MedDRA (version 13.0) system organ class and preferred term were tabulated by treatment. All adverse events were listed.
All 24 subjects who were randomized completed the two study periods and were included in the pharmacodynamic analysis.
Mean (SEM) GBEFs (%) at 30 and 60 minutes after placebo administration were 59.80% (5.67) and 84.95% (4.20), respectively, which is in agreement with values expected for healthy subjects. Thirty and 60 minutes after a single administration of lixisenatide mean GBEFs (%) were 17.97 (3.35) and 39.01 (5.85). Under lixisenatide 22 out of 24 subjects had a G6EF at 60 minutes that was lower than the GBEF under placebo at 60 minutes.
The estimate of the mean difference between placebo and lixisenatide for the primary endpoint (GBEF at 60 minutes) was 45.8% (95% CI: 29.92; 61.68). The upper limit of the confidence interval was greater than 20%, indicating that the non- inferiority of lixisenatide versus placebo was not demonstrated.
aMean is provided by LSM
bMean difference = LSM (Placebo) − LSM (Lixisenatide 20 μg)
The estimate of the mean difference between placebo and lixisenatide was 41.43% (95% CI: 28.64; 54.23).
aMean is provided by LSM
bMean difference = LSM (Placebo) − LSM (Lixisenatide 20 μg)
There were no serious adverse events or withdrawals from the study due to a TEAE. Under lixisenatide. 4/24 (16.7%) subjects experienced at least 1 TEAE compared to 1/24 (4.2%) subjects under placebo. All TEAEs were of mild or moderate intensity.
The TEAEs in subjects on lixisenatide were mainly gastrointestinal disorders, such as nausea (3/24) and vomiting (1/24). One subject experienced an episode of mild vomiting that occurred about 5 hours after the lixisenatide administration, and about 4 hours after the commencement of the CCK infusion. The symptom lasted about 5 minutes and resolved without treatment. There were no adverse events suggestive of an allergic reaction. One subject experienced an Injection site hematoma 1 day after lixisenatide administration. The hematoma was of mild intensity and gradually resolved over the following 11 days.
No PCSAs were observed for liver function
Prolonged QTc was observed for two male subjects. One subject who received lixisenatide during Period 2 had a QTc of 452 msec (rechecked; 455 msec) at the end-of-study visit (baseline: 418 msec). Another subject who received placebo during Period 1 had a QTc of 459 ms on Day 1 at Period 2 (rechecked value at D1: 436 ms).
Pharmacokinetic results: After subcutaneous dosing of 20 μg lixisenatide, the mean peak-exposure (Cr-*) was 104 pg*h/mL and appeared after 2 hours (median). The overall exposure (AUG) as mean amounted to 634 pg*h/mL, and the mean exposure during the interval for the primary endpoint for gallbladder emptying (AUC12h) was 87.3 pg*h/mL
In this placebo-controlled crossover study, subcutaneous administration of a single dose of lixisenatide 20 μg in healthy subjects significantly reduced GB emptying expressed as GBEF(%) in response to CCK-8 at 30 and 60 minutes. Non-inferiority of lixisenatide versus placebo after 60 minutes of CCK-8 infusion was not demonstrated
Treatment with lixisenatide resulted in maximum plasma concentrations 2 hours after infection. The overall exposure (AUC) as mean was 634 pg*h/mL, and the mean exposure during the interval for the primary endpoint for gallbladder emptying (AUC12h) was 87.3 pg*h/mL
Lixisenatide was overall well tolerated and was assessed to be safe in the 24 subjects studied. The most frequent adverse event was nausea. None of the adverse events was severe or serious.
Ab Antibody
AE adverse event
AEPM adverse events with pre-specified monitoring
ALT alanine aminotransferase
ARAC Allergic Reaction Assessment Committee
AUC area under the concentration time curve
CCK Cholecystokinin
CCK-8 terminal amino acid fragment of cholecystokinin
CI confidence interval
Cmax maximum observed plasma concentration
CRF case report form
CT computed tomography
CV coefficient of variation
D Day
DBP diastolic blood pressure
ECG Electrocardiogram
FDA United States Food and Drug Administration
GB Gallbladder
GBEF gallbladder ejection fraction
GLP glucagon-like peptide
HCL hydrochloric acid
HIV human immunodeficiency virus
LLOQ lower limit of quantification
MedDRA Medical Dictionary for Regulatory Activities
MRI magnetic resonance imaging
NaOH sodium hydroxide
P Period
PCSA potentially clinically significant abnormality
QC quality control
QRS QRS complex on electrocardiogram (ventricular depolarization)
QTc QT interval automatically corrected for heart rate
QTcF QT interval, Fridericia correction
SAE serious adverse event
SBP systolic blood pressure
SD standard deviation
SEM standard error of the mean
SOC system organ class
99mTc technetium99m
TEAE treatment-emergent adverse event
tmax time to reach Cmax
ULN upper limit of normal
Independent Ethics Committee or Institutional Review Board
The protocol was submitted to independent ethics committees and/or institutional review boards for review and written approval.
Ethical Conduct of the Study
The protocol complied with recommendations of the 18th World Health Congress (Helsinki, 1964) and all applicable amendments. The protocol also complied with the laws and regulations, as well as any applicable guidelines, of the country where the study was conducted (Great Britain).
Subject Information and Consent
Informed consent was obtained prior to the conduct of any study-related procedures. The subject informed consent form was modified according to local regulations and requirements.
Introduction
Lixisenatide is a glucagon-like peptide 1 (GLP1) receptor agonist exendin analog being developed for treatment of type 2 diabetes.
Cases of acute pancreatitis have been reported in patients treated with GLP 1 agonists, and the causality is still unclear. There is an ongoing discussion as to whether pancreatitis is a potential class effect of GLP1 treatment or whether the cases may have been overvalued. One hypothesis is that GLP1 agonists may change sphincter of Oddi motility due to gastric distension, predisposing patients to gallbladder (GB) sludge or gallstone formation and thus pancreatitis.
Cholecystokinin-stimulated cholescintigraphy was first described more than 3 decades ago and is used routinely to calculate gallbladder ejection fraction (GBEF) in studies on biliary dynamics and gallbladder motility. Cholescintigraphy is performed after administration of technetium-99m (99mTc) labeled iminodiacetic acid analogs. These compounds have a high affinity for hepatic uptake and are readily excreted into the biliary tract and concentrated in the gallbladder. A fatty meal or exogenous cholecystokinin is then used as a stimulus for induction of gallbladder emptying. A low GBEF has been considered as evidence of impaired gallbladder motor function that, in the absence of lithiasis, can identify patients with primary gallbladder dysfunctions and sphincter of Oddi obstruction. Since GBEF is variable depending on the dose and duration of cholecystokinin8 (CCK8, terminal amino acid fragment of CCK) infusion, many different values have been used to define abnormal gallbladder function; increasing evidence has suggested that longer infusions (30 to 60 minutes) are superior to shorter infusions (1 to 3 minutes) for accurate quantification of GBEF.
The aim of the present study was to assess the effect of a single subcutaneous injection of lixisenatide on stimulated gallbladder emptying (as an indirect measure of a potential impact on the sphincter of Oddi) expressed as GBEF induced by CCK8.
Primary Objective
To assess the effect of 20 pig lixisenatide on gallbladder (GB) emptying expressed as GB ejection fraction (GBEF) at 60 minutes induced by a continuous infusion of 0.02 μg/kg h cholecystokinin (CCK8)
Secondary Objectives
To assess GBEF at 30 minutes
To assess the pharmacokinetic profile of a single subcutaneous injection of 20 μg lixisenatide
Description of Overall Study Design and Plan
This was a single-center, double-blind, randomized, placebo controlled, single dose, 2period, 2-sequence, 2treatment crossover study comparing lixisenatide injection with saline injection (placebo) in healthy male and female subjects.
Subjects were admitted to the unit the morning on Day 1. On Day 1, after an overnight fast with ad libitum access to water, they were prepared for cholescintigraphy. Subjects received a subcutaneous dose of 20 μg of lixisenatide or placebo according to randomization, followed immediately by an intravenous bolus of the radiolabel. After 99mTc injection, images were obtained for 60 minutes. After gallbladder visualization at 60 minutes, CCK8 was infused over 60 minutes; GB images were obtained for at least an additional 60 minutes following commencement of the CCK8 infusion.
Blood samples for determination of concentrations of lixisenatide were taken for up to 12 hours after injection of lixisenatide.
Subjects were randomized in a double-blinded manner to Sequence 1 or Sequence 2 (
Sequence 1
Sequence 2
The total duration of study participation for each subject was planned to be 7 to 42 days and consisted of:
No interim analysis was planned. There were no amendments to the protocol.
The visit schedule is described in Table 1
This randomized, placebo-controlled, 2 sequence, 2 treatment crossover study was designed to assess the effect of a single dose of lixisenatide on gallbladder emptying. A crossover design was chosen to avoid the influence of between-subject variability.
The study included male and female subjects in order to match the type 2 diabetes target population. Although it has been observed that the majority of patients who present with Sphincter of Oddi dysfunction causing recurrent episodes of acute pancreatitis are female (1), in healthy subjects GBEF does not differ between men and women. Only postmenopausal females were included to avoid exposing females of childbearing potential to unnecessary radiation. Although significant impairment of GB emptying has been reported in obese type 2 diabetic patients (2), in healthy subjects no statistically significant correlation body mass index and GBEF has been observed. Therefore, male and female subjects with a body mass index up to 35 kg/m2 were included in the study.
To maximize bile entry into the gallbladder by allowing maximum relaxation of the gallbladder and maximum contraction of the sphincter of Oddi (3), cholescintigraphy was conducted under fasted conditions. Radiolabel was injected directly after administration due to the lixisenatide tmax of about 1.5 to 2 hours.
The rapid disappearance of lixisenatide from blood circulation when absorption is complete (mean peak plasma concentrations of approximately 100 pg/mL at about 1.5 hours after injection) enabled short washout periods of 2 days and an end-of-study visit within a week of the last dosing.
Since lixisenatide is a peptide that may potentially generate allergic reactions, the study employed an Allergic Reaction Assessment Committee assess allergic reactions or allergic-like reactions that occurred in the study.
A total of 24 subjects were to be enrolled to have 20 evaluable subjects (with at least 30% of each gender randomized).
Subjects were included in the study according to the following criteria.
Inclusion Criteria
Demography
Male or female subject, between 35 and 65 years inclusive.
Body mass index between 18.0 and 35.0 kg/m2 inclusive.
Health Status
Certified as healthy by a comprehensive clinical assessment (detailed medical history and complete physical examination).
Normal vital signs after 10 minutes resting in supine position:
Normal standard 12 lead electrocardiogram (ECG) after 10 minutes resting in supine position;
Laboratory parameters within the normal range, unless the Investigator considered an abnormality to be clinically irrelevant for healthy subjects; however, serum creatinine, alkaline phosphatase, hepatic enzymes (aspartate aminotransferase, alanine aminotransferase, bilirubin (unless the subject has documented Gilbert syndrome) were not to exceed the upper laboratory norm.
If female sterilized for more than 3 months or postmenopausal; menopause was defined as over the age of 60 years, or between 45 and 60 years being amenorrheic for at least 2 years with plasma follicle-stimulating hormone level >30 UI/L. Certified as healthy by a comprehensive clinical assessment (detailed medical history and complete physical examination).
Regulations
Must have given written informed consent prior to any procedure related to the study. Covered by a Health Insurance System where applicable, and/or in compliance with the recommendations of the national laws in force relating to biomedical research.
Not under any administrative or legal supervision.
Exclusion Criteria
Medical History and Clinical Status
Any history or presence of clinically relevant cardiovascular, pulmonary, gastrointestinal, hepatic, renal, metabolic, hematological, neurological, osteomuscular, articular, psychiatric, systemic, ocular, gynecologic (if female), or infectious disease, or signs of acute illness.
Frequent headaches and/or migraine, recurrent nausea and/or vomiting (more than twice a month). Blood donation, any volume, within 3 months before inclusion.
Symptomatic postural hypotension, whatever the decrease in blood pressure, or asymptomatic postural hypotension defined by a decrease in systolic blood pressure≧20 mmHg within 3 minutes when changing from the supine to the standing position.
Presence or history of drug hypersensitivity, or clinically significant allergic disease diagnosed and treated by a physician.
History or presence of drug or alcohol abuse (regular alcohol consumption>21 units per week in males and >14 units per week in females [1 Unit=½ pint beer, a 25 mL shot of 40% spirit or a 125 mL glass of wine).
Smoking more than 5 cigarettes or equivalent per day, unable to stop smoking during the study. Excessive consumption of beverages with xanthine bases (>4 cups or glasses per day).
Interfering Substance
Any medication (including St John's Wort) within 14 days before the inclusion or within 5 times the elimination half-life or pharmacodynamic half-life of that drug, any vaccination within the last 28 days.
General Conditions
Any subject who, in the judgment of the Investigator, was likely to be noncompliant during the study, or unable to cooperate because of a language problem or poor mental development.
Any subject in the exclusion period of a previous study according to applicable regulations.
Any subject who could not be contacted in case of emergency.
Any subject who was the Investigator or any subinvestigator, research assistant, pharmacist, study coordinator, or other staff thereof, directly involved in the conduct of the protocol.
Biological Status
Positive reaction to any of the following tests: hepatitis B surface antigen, anti-hepatitis C virus antibodies, anti-human immunodeficiency virus 1 and 2 antibodies (antiHIV1 and antiHIV2 Ab).
Positive results on urine drug screen (amphetamines/methamphetamines, barbiturates, benzodiazepines, cannabinoids, cocaine, opiates).
Positive alcohol test.
Specific to the Study
Acute diarrhea or constipation in the 7 days before the predicted first study day. If screening occurred >7 days before the first study day, this criterion was determined on first study day. Diarrhea was defined as the passage of liquid feces and/or a stool frequency of greater than 3 times per day. Constipation was defined as a failure to open the bowels more frequently than every other day.
Radiation exposure from clinical trials, including that from the present study, excluding background radiation but including diagnostic xrays and other medical exposures, exceeding 5 mSv in the last 12 months or 10 mSv in the last 5 years. No occupationally exposed worker, as defined in the Ionising Radiation Regulations 1999, was allowed to participate in the study.
Previous treatment with lixisenatide, exenatide (Byetta™) or other parenteral GLP 1 agonists.
History of pancreatitis, chronic pancreatitis, gallbladder disease, pancreatectomy, stomach/gastric surgery, inflammatory bowel disease.
Presence of gall stones or clinically significant liver abnormalities on ultrasound scans.
Removal of Subjects from Therapy or Assessment
Subjects could withdraw from the treatment if they decided to do so, at any time and irrespective of the reason, or subjects could be withdrawn based on the Investigator's decision.
Subjects experiencing a confirmed allergic reaction that was considered by the Investigator to be closely related to the administration of investigational product were to be withdrawn from further treatment.
Specific stopping rules were to be considered from screening to the end of the study. Administration of investigational product was to be stopped in case of QTcF (QTc, Fridericia correction) prolongation (automatic measurement: ≧500 ms), confirmed by a manual reading, and in the event of pregnancy. In addition, with any diagnosis of acute pancreatitis, treatment with investigational and other potentially suspect drugs was to be stopped and the subject was to be followed up clinically.
Investigational Products
Lixisenatide
Placebo
The OptiClik pen-type injector was provided by the Sponsor to each subject for injection of investigational product. Needles (Ypsomed Optifine™ 8, 8 mm X 31 G, Order no. 3100564) were purchased by the clinical unit. Dispensing materials were to be kept by the Investigator up to the full documented reconciliation performed with the Sponsor at the end of the study.
Noninvestigational Products
Radiopharmaceutical (99mTc mebrofenin/Cholediam)
The Cholediam® kit for preparation of 99mTc mebrofenin injection was provided by Quotient Clinical and contained 40 mg mebrofenin and 0.6 mg stannous chloride dehydrate. The effective dose in this study was not to exceed 60 MBq (1.44 mSv) per period and 120 MBq (2.88 mSv) in total.
Cholecystokinin8 (Kinevac/sincalide)
Cholecystokinin8 (CCK8) was supplied as sincalide for injection (Kinevac®) by the Sponsor. Vials containing 5 pg sincalide were reconstituted with 5 mL sterile water. Then, 2.5 μg sincalide was diluted to 50 mL with saline in a 50 mL syringe and infused according to the following formula:
Rate of infusion (mL/hr)=weight (kg)×0.02 (CCK8 dose)×20 (volume of solution containing 1 μg CCK8)
Identity of Investigational Products
Investigational Products
Investigational product was supplied by the Sponsor as a sterile aqueous solution for subcutaneous injection containing 300 μg/mL lixisenatide (100 μg/mL0, glycerol, sodium acetate trihydrate, methionine, meta-cresol, HCl/NaOH, and water for injection in a 3-mL glass cartridge (batch number FRA01282/400008/C1005517).
Placebo was supplied as a sterile aqueous solution for subcutaneous injection containing sodium chloride, meta-cresol, HCl/NaOH, and water for injection (batch number FRA01419/400006/C1005518).
Noninvestigational Products
Technetium99m (99mTc) mebrofenin was supplied as a Cholediam for injection kit by Quotient Clinical; each vial contained 40 mg mebrofenin and 0.6 mg stannous chloride dehydrate in a sterile, pyrogen-free, freeze-dried solution under nitrogen (batch number FRA01419/40C006/C1005518).
Cholecystokinin-8 was supplied by the Sponsor as sincalide for injection (Kinevac) in vials containing 5 μg sincalide (batch number C1008567).
Method of Assigning Subjects to Treatment Groups
The randomization treatment kit number list was generated centrally by sanofiaventis.
Before administration of investigational product on Day 1 of the first study period, subjects who complied with all inclusion/exclusion criteria were assigned:
Subjects were randomized to Sequence 1 or Sequence 2. The randomization ratio was 1:1 and was stratified by sex to ensure that at least 30% of each sex was treated in this study. For further details, refer to the study protocol.
Selection of Doses in the Study
The 20 μg dose of lixisenatide used in this study was considered to provide the best benefit-risk ratio and was well tolerated in both nondiabetic and diabetic populations, based on results of a Phase 2 dose-ranging study.
The risk associated with the maximum possible dose of radiation used was very small and was considered acceptable. The effective 99mTc dose that each subject received did not exceed 60 MBq (1.44 mSv) for one administration and 120 MBq (2.88 mSv) for 2 administrations. This is in accordance with the Administration of Radioactive Substances Advisory Committee, which recommends that the 99mTc dose not exceed 150 MBq for diagnostic procedures of the gallbladder and is only slightly higher than the average natural background radiation dose received in the United Kingdom each year (2.7 mSv).
Sincalide is the only CCK8 analogue approved by the US Food and Drug Administration (FDA). Although in published studies CCK8 doses varied from 0.01 to 0.5 μg/kg and the infusion duration from a bolus injection to durations of 1 to 60 minutes, short infusions caused abdominal cramps and nausea and made reproducible normal ranges for GB injection fraction difficult to achieve (4). In a study of 3 different CCK8 infusion methods in 60 subjects with a 0.02 μg/kg dose administered as a 15 minute, 30 minute, and 60 minute infusion, it was shown that a 60 minute infusion had the lowest variability in healthy subjects compared with shorter infusions of 15 and 30 minutes (5). Therefore, in this study, 0.02 μg/kg was infused for 60 minutes.
Selection and Timing of Dose for Each Subject
Investigational Products
Lixisenatide
A 20 μg dose of lixisenatide was administered once in the morning in fasted conditions on Day 1 in Period 1 or Period 2, according to the randomization schedule. A 20 μg dose of lixisenatide corresponded to 20 units on the OptiClik pen (200 μL).
Placebo
Placebo (200 μL) was administered once in the morning in fasted conditions on Day 1 in Period 1 or Period 2, according to the randomization schedule (20 units on the OptiClik pen).
Noninvestigational Products
Radiopharmaceutical (99mTc mebrofenin/Cholediam)
A single dose of 99mTc mebrofenin was infused intravenously in the morning on Day 1 of each period after an overnight fast of at least 10 hours, directly after administration of lixisenatide or placebo.
Cholecystokinin8 (Kinevac/Sincalide)
A single dose of CCK8 (0.02 μg/kg) was infused starting 60 minutes after administration of the radiolabel and for 60 minutes on Day 1 of each period.
Blinding Procedures
All personnel involved in the study were blinded until database lock except for the bioanalyst and pharmacokineticist responsible for the sample analysis and pharmacokinetic evaluation.
Investigational product and placebo were indistinguishable and injection volumes were the same. Each treatment kit and the corresponding cartridge were labeled with a number generated by a computer program from sanofiaventis. The Investigator was not to have access to the randomization (treatment) code except when knowledge of the investigational product was essential for treating the subject.
ARAC members were to review and adjudicate allergic reactions or allergic-like reactions in a blinded manner.
Prior and Concomitant Therapy
Medications that were not to be used prior to inclusion are specified in Section 0.
Concomitant medication was not allowed during the study. However, if a specific treatment was required for any reason, an accurate record was to be kept on the appropriate record form, including the name of the medication (international nonproprietary name), daily dosage, and duration for such use.
Treatment Compliance
Investigational product was administered under direct medical supervision. The actual dose and exact time of each administration was recorded in the case report form. A mouth inspection was to be performed to check for ingestion of investigational product by the subject.
An overview of safety, pharmacokinetics, and pharmacodynamics assessments is presented in Table 1; a detailed schedule for each period is provided in Table 2.
a27 days washout between doses
bRefer to Safety section for detailed safety investigations
cFor females between 45 and 60 years being amenorrheic for at least 2 years
dAllow subjects to experience remaining stationary and supine under the camera.
Xd
Xg
aSubjects dosing was staggered, with 2 dosing times
bTime (hour/minute) is expressed in reference to the last administration of lixisenatide (T0 H)
dJust after lixisenatide/placebo administration
fSubjects were to have regular standard meals on Day 1. On Day 1 first meal after completion of scintigraphy for all subjects otherwise regular standard meals (snack, lunch and dinner)
gOnly Period 1, after randomization
hDirectly before dosing
iSubjects were allowed to remain stationary and supine under the camera
Pharmacodynamics Assessments
Gallbladder emptying after stimulation by administration of CCK8 was expressed as GBEF, the percentage change of net GB counts after administration of the stimulus. GBEF was assessed at 30 and 60 minutes after the start of CCK8 administration according to the following formula:
Pharmacodynamics Measurements and Timing
After an overnight fast, subjects received 20 μg lixisenatide subcutaneously and immediately afterward received an intravenous infusion of mebrofenin labeled with 99mTc while lying supine underneath a large-field-of-view gamma camera. Hepatic phase images were obtained at 1 frame per minute for 60 minutes. After GB visualization at 60 minutes, 0.02 μg/kg CCK8 was administered via a constant infusion pump for 60 minutes. Image acquisition continued after the start of CCK8 infusion as 1 minute frames for at least an additional 60 minutes until completion of the CCK8 infusion. Regions of interest were drawn around the gallbladder and background (adjacent normal liver) on a frame displaying a clear image of the gallbladder, and a background-corrected time-activity curve was generated. Due to the short duration of the assessment period, no correction for radioactive decay was performed.
Primary Pharmacodynamic Variable(s)
The primary pharmacodynamic variable was GBEF at 60 minutes after start of the CCK8 infusion on Period 1, Day 1 and Period 2, Day 2.
Secondary Pharmacodynamic Variables
The secondary pharmacodynamic variable was GBEF at 30 minutes after start of the CCK8 infusion on Period 1, Day 1 and Period 2, Day 2. GBEF was also collected every 2 minutes during the study.
Safety Variables and Timing of Assessment
Safety was monitored via:
Clinically significant abnormalities (if any) were monitored until resolution or until clinically stable.
Serology (hepatitis B surface antigen, hepatitis C antibodies, antiHIV1 and antiHIV2 antibodies) was performed at screening only. A urine drug screen and alcohol breath test were performed at screening and on Day 1 of each period.
Adverse Events
All adverse events, regardless of seriousness or relationship to the investigational product, from signature of the informed consent form until the end-of-study visit, were to be recorded. For each adverse event, the Investigator was to specify the date of onset, intensity, action taken with regard to the investigational product, corrective treatment given, and outcome and was to provide an assessment as to whether there was a reasonable possibility that the adverse event was related to the investigational product.
A serious adverse event (SAE) is any untoward medical occurrence that at any dose:
Adverse Events with Pre-Specified Monitoring
Adverse events requiring pre-specified monitoring (AEPMs) were defined as adverse events (serious or nonserious) that were to be monitored, documented, and managed in a pre-specified manner described in the protocol.
The Sponsor was to be notified immediately for:
AEPMs without immediate notification were:
Laboratory Safety Parameters
Standard clinical laboratory parameters (biochemistry, hematology, urinalysis) were measured at screening, on Day 1 of each period, and at the end-of-study visit (Table 1). Additional tests could be performed during the study according to the medical judgment of the Investigator. Blood samples were obtained in fasted conditions.
Urinalysis: dipstick proteins, glucose, erythrocytes, leucocytes (quantitative tests to beperformed if positive), ketone bodies, pH
Laboratory Safety Parameters with Pre-Specified Monitoring
The following laboratory abnormalities were to be monitored, documented, and managed.
Neutropenia
Thrombocytopenia
Acute renal insufficiency
Suspicion of rhabdomyolysis
Other Safety Parameters
Vital Signs
Heart rate, blood pressure (systolic and diastolic measurements), and body temperature were measured at screening, Day 1 of each period, and at the end-of-study visit. Heart rate and blood pressure were obtained after 10 minutes in the supine resting position and also after 3 minutes in the standing position.
Electrocardiogram
A standard 12 lead ECG was recorded after at least 10 minutes in the supine position (10second recording at 25 mm/s, 10 mm/mV). Electrocardiogram parameters derived from automatic measurements were HR, PR, QRS, QT, and QTc.
Physical Examination
Physical examination included heart and respiratory auscultation; peripheral arterial pulse; pupil, knee, Achilles, and plantar reflexes; peripheral lymph node examination; and abdominal examination.
Pharmacokinetics Assessments and Timing
Pharmacokinetic Measurements and Timing
The sampling times for blood collection can be found in the Period Flow Chart (Table 2). The bioanalytical method used for measuring lixisenatide in plasma samples is described briefly in Table 3.
All plasma samples from subjects who had been treated with lixisenatide were analyzed. From subjects who had received placebo, only the sample taken 1.5 hours postdose (P03) were to be analyzed by the bioanalyst, who was unblinded prematurely for this.
Pharmacokinetic Variables
Table 4 lists the main pharmacokinetic parameters, which were determined based on plasma concentrations of lixisenatide. Partial AUCs during the analysis of gallbladder emptying were added in order to be able to explore the respective influence of the exposure.
Appropriateness of Measurements
Standard measurements appropriate to assess the objectives were used in the study. The primary endpoint, GBEF, is commonly used to assess gall bladder emptying, and cholecystokinin-stimulated cholescintigraphy is used routinely for calculation of GBEF in the study of biliary dynamics and gallbladder motility.
Regular site monitoring ensured the quality of trial conduct. Management of clinical trial data was performed according to the following rules and procedures. Data entry, verification, and validation were carried out using standard computer software (Oracle® Clinical version 4.5.1); data were stored in an Oracle database on a digital VMS computer. A double-entry method was used to ensure that the data (except comments) were transferred accurately from the CRFs to the database. Moreover, every modification in the database could be traced using an audit trail. A data checking plan was established to define all automatic validation checks, as well as supplemental manual checks, to ensure data quality. All discrepancies were researched until resolved.
Sanofi-aventis conducted an Investigator meeting to develop a common understanding of the clinical study protocol, case report form, and study procedures as well as individual site initiation meeting.
Pharmacokinetic Data Handling and Data Quality Assurance
Demographic data, date and time of administration, date and time of sampling, and concentrations were transferred electronically to the pharmacokinetic database from the Oracle Clinical and Watson databases. The transfer of the concentration data into Watson was quality control (QC)-checked; no discrepancies were determined. Pharmacokinetic parameters given in all tables are computer-generated. Concentration values below the lower limit of quantification (LLOQ) were treated as zero in calculating mean values for the concentrations; for calculating pharmacokinetic parameters, they were treated as zero only if appearing before Cmax, otherwise as ‘missing’.
Mean calculations and their associated statistics were generated from unrounded numbers and may differ slightly from those values which would have been determined using rounded numbers. Once final pharmacokinetic analysis was performed, pharmacokinetic parameters were transferred electronically to the Biostatistics Department for further statistical. Concentration and pharmacokinetic parameter values were rounded to 3 significant figures in all tables of the report.
All raw data from the bioanalytical and pharmacokinetic sections of this study are held in the appropriate archive files.
Examples of gallbladder filling and emptying curves and GBEF (%) in a normal healthy subject under placebo and lixisenatide are provided (
Statistical and Analytical Plans
Details of statistical methods are summarized as follows. The analysis of clinical data was performed under the responsibility of the sanofiaventis Biostatistics and Programming Department, using SAS® (SAS/Unix V9.2, SAS Institute, NC USA). The statistical analysis of pharmacokinetic parameters was performed by the Drug Disposition Department, using Pharmacokinetic Data Management System (PKDMS) (in-house software version 2.0 with WinNonlin Professional® version 5.2.1).
Analysis of Pharmacodynamic Variables
All pharmacodynamic analyses were performed using the pharmacodynamic population.
Description of Pharmacodynamic Variables
The pharmacodynamic endpoints are the GBEF measured by cholescintigraphy at 60 minutes (primary variable) and 30 minutes (secondary variable) induced by a continuous infusion of 0.02 μg/kg CCK8. GBEF, provided by Quotient Clinical, is equal to the percentage change of net GB counts after administration of the stimulus.
Primary Analysis
GBEF at 60 minutes was analyzed using a linear mixed-effects model:
GBEFat 60 min=Sequence+Period+Sex+Treatment+Error with fixed terms for Sex, Sequence (“Lixisenatide-Placebo” versus “Placebo-Lixisenatide”), period (1 versus 2), and Treatment (Lixisenatide versus Placebo), and with an unstructured R matrix of treatment(i,j) variances and covariances for subject-within-sequence blocks, using SAS PROC MIXED.
Differences between treatment groups and corresponding 95% CIs were estimated within the linear mixed effects model framework. Noninferiority was demonstrated if the upper limit of the 2sided 95% CI for the absolute difference of GBEF between the 2 treatment groups (placebo minus lixisenatide) was less than 0.20 (or 20%).
It was explored graphically if GBEF at 60 minutes was normally distributed. In case of obvious deviation from the normal distribution, a nonparametric method was planned to be used.
Secondary Analysis/Analysis of Secondary Variables
Analysis of the Secondary Endpoint
For GBEF at 30 minutes, the same linear mixed effects model was carried out as described above to estimate the differences between treatment groups and corresponding 95% CIs. Likewise, a nonparametric approach was planned to be carried out if needed.
Descriptive Statistics and Plots
GBEF at 30 and 60 minutes were summarized by treatment group and listed by subject, sequence, and visit. The same descriptive statistics are provided by sex.
Boxplots for both endpoints are provided by treatment group; individual plots were also produced.
Additionally, GBEF data every 2 minutes after the start of CCK8 infusion were plotted individually by subject, summarized by median and mean plots by treatment group, and listed.
Variance Components
Within-subject, between-subject, and total standard deviations for GBEF at 30 and 60 minutes were estimated by equating observed and expected means squares within the following linear mixed effects model framework:
GBEFat 30 or 60 min=Sequence+Period+Sex+Treatment+Subject(Sequence)+Error with fixed terms for Sex, Sequence (“Lixisenatide-Placebo” versus “Placebo-Lixisenatide”), period (1 versus 2), and Treatment (Lixisenatide versus Placebo), and a random effect for subject within sequence, using SAS PROC MIXED. The 90% CIs were computed using the simple χ2 method for the within-subject SD and the Graybill Wang procedure for the total SD (6).
Listings
A listing of GB cholescintigraphy data (GBEF values at 30 and 60 minutes, dates and times of cholescintigraphy) are provided by subject and sequence.
Analysis of Safety Data
The safety evaluation was based on review of the individual values (clinically significant abnormalities), descriptive statistics (summary tables, graphics) and if needed on statistical analysis (appropriate estimations, confidence intervals). The safety analysis was conducted according to the sanofiaventis document “Summarizing and Reporting Clinical Pharmacology Trial Data.”
All safety analyses were performed using the safety population.
For all safety data, the observation period was divided into 3 segments:
All safety analyses were based on the on-treatment phase.
The definition of potentially clinical significant abnormalities (PCSA) list used in the statistical analysis of laboratory parameters, vital signs, and ECG data was version 2.0, dated 14 Sep. 2009.
Adverse Events
Definitions
Adverse events were coded according to the Medical Dictionary for Regulatory Activities (MedDRA, version 13.0). They were classified into predefined standard categories according to chronological criteria:
TEAEs were assigned to the investigational product received at the time of adverse event onset (lixisenatide or placebo). If a TEAE developed on one treatment and worsened under a later treatment, it was considered treatment-emergent for both treatments.
If the start date (or time) of an adverse event was incomplete or missing, then the adverse event was considered as a TEAE in each period unless a partial date (or time) or comment showed it to be a pre or posttreatment event.
All adverse events reported in the study were listed on an individual basis with flags to indicate adverse event status. This listing was sorted by subject, treatment, onset date, and time. However, the analyses of adverse events focused on the TEAEs.
Treatment-Emergent Adverse Events
The numbers and percentages of subjects with any TEAE, any serious TEAE, any severe TEAE, any TEAE leading to permanent treatment discontinuation, or any TEAE leading to death (only if any occurred) were summarized by treatment group.
Subjects presenting TEAEs were listed sorted by treatment group, primary system organ class (SOC, sorted by MedDRA order) and preferred term (PT).
TEAEs were summarized by treatment group, tabulating:
The number and percent of subjects with at least 1 TEAE within each and over all SOC(s);
The number and percent of subjects experiencing each preferred term in each SOC;
The number of occurrences of all preferred terms within each and over all SOC(s);
The number of occurrences of each preferred term in each SOC.
Deaths, Serious and Other Significant Adverse Events
Any death, SAE, or other significant adverse event was listed, sorted by subject, onset date, and time.
Adverse Events Leading to Treatment Discontinuation
Any adverse event leading to permanent treatment discontinuation was listed, sorted by subject, onset date, and time.
Allergic Reactions
Listings of Allergic Reactions
Any cases of events potentially related to an allergic reaction were documented as adverse events with detailed complementary information.
A listing of individual data (separate from the listing of all adverse events, see Section 0) is provided, sorted by subject, onset date and time, irrespective of the definition of the on-treatment phase, including particularly a description of the adverse event, symptoms of the adverse event, possible etiologies, actions taken, vital signs measurements (at outset, during reaction, and at recovery) and a description of the allergic or allergic-like event.
The assessment of all these cases by the Allergic Reaction Assessment Committee (ARAC) was also listed, including particularly whether the event reported constituted an allergic reaction and if it did, its diagnosis and severity grade.
All cases are described in detail in the Clinical Study Report.
Subject and Family Allergic Medical History
Subject and family allergic medical history, to be documented for subjects with any occurrence of potential allergic reaction, was coded according to the MedDRA version 13.0 and listed by subject.
Suspected Pancreatitis
Any cases of suspected pancreatitis were documented as adverse events with detailed complementary information.
A listing of individual data (separate from the listing of all adverse events, see Section 0) is provided, sorted by subject, onset date, and time, irrespective of the definition of the on-treatment phase, including particularly a description of the adverse event, values of amylase and lipase, the gastroenterologist's evaluation, and potential causes of the pancreatitis.
All cases are described in detail in the clinical study report.
Clinical Laboratory Evaluations
Hematology and Biochemistry Data
Clinical laboratory safety (hematology, biochemistry, and urinalysis) was assessed on Day 1 of treatment Periods 1 and 2 and at the end-of-study visit. According to the study schedule, these safety parameters were not planned to be assessed during the on-treatment period.
Baseline values were the values collected on Day 1 in each treatment period. If any of the scheduled baseline tests were repeated for any subject, the last rechecked values were considered as baseline, provided the tests were done before the first investigational product administration and under the same conditions (eg, fasting for glucose).
Raw data for amylase and lipase were summarized in descriptive statistics by treatment group and timepoint.
The following listings are provided:
Urinalysis Data
All qualitative and quantitative urinary test results (dipstick), including rechecked values, were listed.
Vital Signs
Heart Rate and Blood Pressure
Heart rate and systolic and diastolic blood pressure (SBP and DBP) were measured after 10 minutes in the supine resting position and after 3 minutes in standing position on Day 1 of treatment periods 1 and 2 and at the end-of-study visit. According to the study schedule, these safety parameters were not planned to be assessed during the on-treatment period.
The values used as baseline were the D1 assessment values of each treatment period. If any of the scheduled baseline tests were repeated for any subject, the last rechecked values were considered as baselines, provided the tests were done before the first investigational product administration.
For heart rate and blood pressures, raw data (supine and standing positions) were summarized in descriptive statistics, for each type of measurement (position), parameter, and timepoint.
The following listings are provided:
Body Temperature
All individual data were listed.
Electrocardiogram
Automatic reading ECG was performed on Day 1 of each treatment period and at the end-of-study visit. According to the study schedule, no on-treatment assessment was planned.
Heart rate and PR, QRS, QT, and corrected QTintervals (QTc) from automatic readings of the 12-lead ECG were analyzed as raw parameter values; baseline values were the Day 1 values of each period. If any of the scheduled baseline tests were repeated for any subject, the rechecked values were considered as baseline, provided the tests were performed before the first drug administration.
For all parameters, raw data were summarized in descriptive statistics, by treatment group and timepoint.
The following listings were provided:
A listing of subjects with at least one abnormality in qualitative assessment (ie, abnormal ECG) after the first dosing.
Analysis of Pharmacokinetic Data
All pharmacokinetic analyses were performed using the pharmacokinetic population.
At least the following pharmacokinetic parameters were determined on the day of dosing from plasma concentration data of lixisenatide using noncompartmental methods: Cmax, tmax, AUClast, AUC, and t1/2z.
Pharmacokinetic parameters were summarized by descriptive statistics (number of observations (N), arithmetic and geometric means, standard deviation (SD), standard error of the mean (SEM), coefficient of variation (CV %), median, minimum and maximum, and number of observations.
To support a PK/PD analysis, early partial AUCs were calculated (AUCt1-t2), with t1t2 of 02 h, 1-2 h, and 1 h30.
Pharmacokinetics/Pharmacodynamics Analysis
Not applicable.
Other Statistical/Analytical Considerations
Not applicable.
Determination of Sample Size
With a 2×2 crossover design, a total of 20 completed subjects (10 per sequence) was required to demonstrate for GBEF at 60 minutes that lixisenatide was not inferior to placebo by more than a 20% absolute difference (noninferiority margin) with a power of 90%, if the true within-subject SD is 0.10% and assuming the true difference between placebo and lixisenatide is at most 0.09%. To allow for dropouts, 24 subjects were to be enrolled in the study.
A total of 24 subjects were included, randomized, and exposed to the study treatment (Table 5), and all subjects completed the 2 study periods.
Deviations Relating to Selected Criteria and Resulting in Exclusion from Thepharmacodynamic Analyses
There were no protocol deviations that led to exclusion from the pharmacodynamic analyses. One deviation related to not meeting inclusion criterion i05 (QRS=122 msec) was not considered as clinically relevant.
Randomization and Dosing Irregularities
There were no randomization irregularities during the study. All 24 subjects received investigational product (lixisenatide, placebo) and the radiolabel and CCK-8 were administered as planned.
Subject No. 826001012 did not seem to be exposed to lixisenatide in any trial periods according to his pharmacokinetic profiles. Several investigations were performed to rule out technical issues. These investigations were described in a Note to File.
It was ruled out that another subject received lixisenatide instead of Subject No. 826001012; in this dosing group no other subject had an unusually high exposure to lixisenatide.
The site confirmed in writing that administration was correctly performed. All cartridges were checked prior to use and drug accountability was complete.
Cartridges 0000644 from Batch 1P0000988 were re-analyzed and product identity of each cartridge was confirmed.
Since no plausible explanation could be found for this observation, the subject was included in the pharmacodynamic and pharmacokinetic analyses.
Other Deviations
No other important deviations were observed.
The blind was not broken during the study.
The safety, pharmacodynamic, and pharmacokinetic populations comprised 24 subjects (Table 6).
Demography
Demographic data for the safety population are summarized in Table 7. There were 15 male and 9 female subjects, aged between 35 and 62 years (mean age±SD: 47.8±7.9 years), and a mean body mass index of about 26 kg/m2. All subjects were of Caucasian origin except for 1 subject who was Black.
Demographic characteristics for male and female subjects are summarized in Table 8.
Medical History
Medical history was obtained at screening for inclusion purposes only; no relevant medical history was recorded.
Disease Characteristics at Baseline
Not applicable. The study enrolled healthy subjects.
Other Baseline Characteristics
None
Prior and/or Concomitant Medication
There were no prior medications stopped before the study start. No concomitant medication was administered during the study.
There were 24 subjects who received the radiolabel, CCK8 infusion, and treatment with either lixisenatide or placebo for 1 day during both trial periods, as planned. The duration of CCK-8 infusion corresponded to the protocol-specified duration of 60 minutes for all subjects.
Pharmacodynamics Results
Primary Pharmacodynamic Variable-Gallbladder Ejection Fraction at 60 Minutes
The parametric estimate of the mean difference between placebo and lixisenatide for the primary endpoint (GBEF at 60 minutes) is 45.80% (95% CI: 29.92; 61.68). The upper limit of the confidence interval is greater than 20%, indicating that noninferiority of lixisenatide versus placebo is not demonstrated (Table 9).
One subject (No. 826001012) did not seem to be exposed to lixisenatide in any trial periods according to his pharmacokinetic profiles. No plausible explanation was possible and hence the data of this subject have been included in the pharmacodynamic population. However, for information purposes, exclusion of this subject from the analysis had minimal impact on the outcome, as shown in Error! Reference source not found.
aMean is provided by LSM
bMean difference = LSM (Placebo) − LSM (Lixisenatide 20 μg)
Secondary Analyses
Secondary Pharmacodynamic Variable
Gallbladder Ejection Fraction at 30 Minutes
The parametric estimate of the mean difference between placebo and lixisenatide for the secondary endpoint (GBEF at 30 minutes) is 41.43% (95% CI: 28.64; 54.23) (Table 10).
Table 17 shows the GBEF at 30 minutes without data from the subject who seemed to be not exposed to lixisenatide in any trial period (see Section 0).
aMean is provided by LSM
bMean difference = LSM (Placebo) − LSM (Lixisenatide 20 μg)
Descriptive Statistics at 30 Minutes and 60 Minutes
Descriptive statistics for GBEF are summarized in Table 11.
The mean (SEM) GBEFs (%) at 30 and 60 minutes after placebo administration were 59.80 (5.67) and 84.95 (4.20), respectively. Thirty and 60 minutes after a single administration of lixisenatide, the mean GBEFs were 17.97 (3.35) and 39.01 (5.85), respectively (Table 11).
Box plots of GBEF at 30 and 60 minutes after placebo and lixisenatide administration are presented in
Descriptive Statistics at 2 Minutes
Plots of mean and median GBEF every 2 minutes during CCK-8 infusion under each treatment are provided in
Pharmacodynamic Conclusions
A single administration of 20 μg lixisenatide significantly reduced GB emptying expressed as GBEF (%) in response to CCK8 compared to placebo at 60 minutes by 45.8% (absolute difference: 95% CI: 29.92; 61.68). Noninferiority of lixisenatide versus placebo was not demonstrated.
The design of this study and the sample size calculation were based on the methodology reported in published literature (5). Using the same dose and duration of infusion of CCK8, this published study reported that in normal healthy subjects the mean GBEF percentages at 30 and 60 minutes were 64% (±23%) and 84% (±16%), respectively. In the PDY11431 study, the GBEF values under placebo were in line with what was expected and were at normal levels (−40% at 60 minutes) in 23 of the 24 subjects. The exception was Subject No. 826001001 who exhibited a GBEF of only 17% at 60 minutes after the start of CCK8 infusion following the administration of placebo. This does not appear to be indicative of consistent functional disorder in this subject, since under lixisenatide the GBEF at 60 minutes was 75.1%.
Under lixisenatide, 22 out of 24 subjects had a GBEF at 60 minutes that was lower than the GBEF under placebo at 60 minutes; for another subject, GBEFs under lixisenatide and placebo were equal. GBEF at 60 minutes was below the lower limit of normal (˜40%) in 13 out of 24 subjects.
Extend of Exposure
All 24 included subjects received either a single dose of 20 μg lixisenatide or placebo during each period of the study and completed the study as planned.
Brief Summary of Adverse Events
No severe TEAEs, treatment-emergent SAEs, or TEAEs leading to study treatment discontinuation were reported during the study.
On lixisenatide treatment, 4 out of 24 (16.7%) subjects experienced at least 1 TEAE compared to 1 out of 24 (4.2%) subjects treated with placebo. All TEAEs were of mild or moderate intensity.
There were no reported allergic adverse events that required a review by the Allergic Reaction Assessment Committee and no cases of suspected pancreatitis.
Display of Adverse Events
The number and percentage of subjects with TEAEs are summarized in Table 13 by treatment group, primary system organ class, and preferred term. All adverse events, described both by the preferred term and the original term used by the Investigator, are provided.
Analysis of Adverse Events
TEAEs in subjects receiving lixisenatide were mainly from the gastrointestinal disorders SOC. The most commonly reported TEAE was nausea, which was reported in 3 subjects (Table 13). All TEAEs were either mild or moderate in intensity.
One subject (No. 826001005) experienced an episode of mild vomiting that occurred about 5 hours after lixisenatide administration and 4 hours after commencement of CCK infusion and was assessed as possibly related to lixisenatide and CCK8 treatment. The symptoms lasted about 5 minutes and resolved without treatment.
One subject (No. 826001021) experienced an infection site hematoma 1 day after lixisenatide administration that was considered as possibly related to lixisenatide by the Investigator. The hematoma was of mild intensity and gradually resolved over the following 11 days.
One subject (No. 826001013) experienced abdominal pain 6 days after lixisenatide administration and was considered as a posttreatment adverse event. The subject was noted to have mild tenderness on deep inspiration and palpation at the right costal margin at the follow-up physical examination. The subject did not observe any abdominal discomfort apart from deep palpation. The remainder of the abdominal examination was normal as were safety laboratory evaluations. The symptoms were fully resolved 2 days later without treatment. This event was considered as possibly related to lixisenatide and CCK-8 administration by the Investigator.
No adverse event led to a global score of ≧3 according to the evaluation of skin responses scale.
A total of 10 adverse events in 8 subjects were documented during the study: 1 pretreatment adverse event, 6 treatment-emergent adverse events, and 3 posttreatment adverse events. The most common adverse events were gastrointestinal disorders (5 adverse events), followed by general disorders (2 adverse events), injury, poisoning and procedural disorders (2 adverse events), and skin and subcutaneous tissues disorders (1 adverse event).
A listing of adverse events (preferred terms) per subject (treatment group) is given below.
Deaths
No deaths were reported during the study.
Serious Adverse Events
There were no serious adverse events reported during the study.
Adverse Events Leading to Withdrawal and Other Significant Adverse Events
There were no adverse events that led to withdrawal from the study, and no significant adverse events were reported.
A subject listing of all laboratory values and all possibly clinically significant abnormalities (PCSA) laboratory values is provided.
Laboratory Value Over Time
Only individual data for laboratory values were analyzed.
Individual Subject Changes in Laboratory Values
There were a few PCSAs in potassium, glucose, neutrophils, and eosinophils on Period 2, Day -1 and at the end-of-study visit. A few subjects had lipase values>2×ULN but rechecked values were within the normal range. There were no reports of PCSAs for liver function, renal function, platelets, or coagulation.
Individual Clinically Relevant Abnormalities in Laboratory Values
No clinically relevant abnormalities in laboratory values were reported during the study.
Vital Signs
Subject listings of all vital signs data are provided.
Vital Signs Values Over Time
Descriptive statistics for vital signs data are provided.
Individual Subject Changes in Vital Signs
One subject (No. 826001004) who was randomized in the sequence placebo-lixisenatide experienced an orthostatic decrease in SBP (standing-supine SBP≦20 mm Hg) at the end-of-study visit. No other PCSAs were observed during the study.
Individual Clinically Relevant Abnormalities in Vital Signs
No clinically relevant abnormalities in vital signs were reported during the study.
Electrocardiograms
Subject listings of all ECG data are provided.
Electrocardiogram Values Over Time
Descriptive statistics for ECG data are provided.
Individual Subject Changes in Electrocardiogram
There was no subject with a PCSA for QTc≧500 ms (Table 14).
Subject No. 826001006, a 44 year old male, had a normal QTc of 418 ms at baseline of Period 2. Four (4) days after he had received a single subcutaneous administration of 20 μg lixisenatide, he had an asymptomatic PCSA for prolonged QTc of 452 ms (rechecked value 455 ms) at the end-of-study visit, corresponding to an increase of 34 ms from baseline (Table 14).
Subject No. 826001017, a 43year old male in the treatment sequence placebo-lixisenatide, had an asymptomatic PCSA for prolonged QTc of 459 ms (rechecked value 436 ms) at baseline of Period 2. The QTc value at the end-of-study visit was normal (409 ms).
Individual Clinically Relevant Abnormalities in Electrocardiogram
No clinically relevant abnormalities in ECG values were reported during the study.
Overall, the administration of 20 μg lixisenatide was well tolerated in healthy subjects. There were no serious adverse events and no withdrawals from the study due to TEAEs.
On lixisenatide treatment, 4 out of 24 (16.7%) subjects experienced at least 1 TEAE compared to 1 out of 24 (4.2%) subjects treated with placebo. All TEAEs were of mild intensity and resolved without corrective treatment. The TEAEs in subjects administered lixisenatide were mainly from the gastrointestinal disorders SOC, such as nausea (3 subjects out of 24) and vomiting (1 subject out of 24).
There were no clinically significant changes in laboratory parameters. No PCSAs were observed in liver and renal function.
There were no clinically significant findings in vital signs and ECG parameters. No subject had a QTc≧500 ms. One male subject who received lixisenatide during Period 2 had a prolonged QTc of 452 ms corresponding to an increase from baseline of 34 ms at the end-of-study visit (4 days after lixisenatide administration). Another subject who received placebo during Period 1 had a QTc of +459 ms on Day-1 at Period 2. The QTc value at the end of study visit was normal (409 ms).
No adverse events related to an allergic reaction or suspected pancreatitis were reported.
Plasma Concentrations
The bioanalytical report for the lixisenatide assay will be available at a later date. Different from the original plan, erroneously all samples from the placebo arm were analyzed.
Individual lixisenatide plasma concentrations and descriptive statistics are provided. Individual lixisenatide plasma concentrations versus time curves are calculated, and superimposed curves for lixisenatide plasma concentrations versus time are calculated.
All blood samples were collected within ±15% of the scheduled sampling times.
Except in one case, the samples taken prior to the lixisenatide dose had concentrations for lixisenatide below LLOQ (12 pg/mL)(for Subject No. 826001010 a value>LLOQ (19.9 pg/mL) was determined predose). In 2 cases subjects who received placebo showed isolated values>LLOQ (Subject No. 826001005 @ T1h30, 12.1 pg/mL and Subject No. 826001023 @ T10h, 18.2 pg/m) whereas the other measurable samples of their profiles were <LLOQ.
For Subject No. 826001012 in both trial periods (placebo and lixisenatide) all samples were below LLOQ, a reason for this could not be found. As a consequence, no pharmacokinetic parameters could be calculated for this subject.
Mean (SD) plasma lixisenatide concentration-time profiles for the lixisenatide treatments are shown in
Individual pharmacokinetic analyses of lixisenatide plasma pharmacokinetic data obtained after a single administration of 20 μg lixisenatide and the corresponding descriptive statistics are provided.
A summary of the descriptive statistics for lixisenatide pharmacokinetic data is given in Table 15.
a No parameters could be calculated for 1 subject (Subject No. 826001012; see Section 0
b Median (Min-Max)
After subcutaneous dosing of 20 μg lixisenatide, the mean peak exposure (Cmax) was 104 pg/mL and appeared after 2 hours (median). The overall exposure (AUC) as mean was 634 pg*h/mL, and the mean exposure during the interval for the primary endpoint for gallbladder emptying (AUC12h) was 87.3 pg*h/mL
Not applicable
After subcutaneous dosing of 20 μg lixisenatide, the mean peak-exposure (C.) was 104 pg/mL and appeared after 2 hours (median). The overall exposure (AUC) as mean was 634 pg*h/mL, and the mean exposure during the interval for the primary endpoint for gallbladder emptying (AUC12h) was 87.3 pg*h/mL.
In this placebo-controlled crossover study, subcutaneous administration of a single dose of lixisenatide 20 μg in healthy subjects significantly reduced GB emptying expressed as GBEF(%) in response to CCK-8 at 30 and 60 minutes. Non-inferiority of lixisenatide versus placebo after 60 minutes of CCK-8 infusion was not demonstrated.
Treatment with lixisenatide resulted in maximum plasma concentrations 2 hours after injection. The overall exposure (AUC) as mean was 634 pg*h/mL, and the mean exposure during the interval for the primary endpoint for gallbladder emptying (AUC12h) was 87.3 pg*h/mL
Lixisenatide was overall well tolerated and was assessed to be safe in the 24 subjects studied. The most frequent adverse event was nausea. None of the adverse events was severe or serious.
1. Kakhi V R, Zakavi S Y, Davoudi Y. Normal values of gallbladder ejection fraction using 99mTc-sestamibi scintigraphy after a fatty meal formula. J Gastrointestin Liver Dis. 2007 June;16(2):157-61. Pubmed PMID: 17592562.
2. Kao C H, Tsou C T, Wang S J, Yeh S H. The evaluation of gallbladder function by quantitative radionuclide cholescintigraphy in patients with noninsulin-dependent diabetes mellitus. Nucl Med Commun. 1993 October;14(10):868-72. PubMed PMID: 8233230.
3. Prandini N. Methods of measuring gallbladder motor functions—the need for standardization: scintigraphy. Dig Liver Dis. 2003 July;35 Suppl 3:S62-6. PubMed PMID: 12974513.
4. Krishnamurthy G T, Krishnamurthy S, Brown P H. Constancy and variability of gallbladder ejection fraction: impact on diagnosis and therapy. J Nucl Med. 2004 November;45(11):1872-7. PubMed PMID: 15534057.
5. Ziessman H A, Tulchinsky M, Lavely W C, Gaughan J P, Allen T W, Maru A, et al. Sincalide-stimulated cholescintigraphy: a multicenter investigation to determine optimal infusion methodology and gallbladder ejection fraction normal values. J Nucl Med. 2010 February;51(2):277-81. Epub 2010 Jan 15. PubMed PMID: 20080900.
6. Burdick R, Graybill F. (1992). Confidence intervals on variance components. Marcel Dekker, NY. ISBN 0-8247-8644-0.
aMean is provided by LSM
bMean difference = LSM (Placebo) − LSM (Lixisenatide 20 μg)
aMean is provided by LSM
bMean difference = LSM (Placebo) − LSM (Lixisenatide 20 μg)
| Number | Date | Country | Kind |
|---|---|---|---|
| 11183863.7 | Oct 2011 | EP | regional |
