Patent Application
20140031326
The invention relates to the treatment of fibromyalgia and chronic fatigue syndrome by administration of an androgen composition. The treatment is effective for treating fibromyalgia-related pain and fatigue.
The Women's Health Initiative (WHI) clinical trial, whose aim was to prospectively evaluate the risks and benefits of orally administered combination hormone replacement therapy in healthy women using estrogens and medroxyprogesterone acetate, was recently halted (Fletcher, S. W. et al. 2002. J. Amer. Med. Assoc. 288:366-368). The increased risks in coronary heart disease, breast cancer, stroke, and pulmonary embolism outweighed the increased benefits in colorectal cancer, endometrial cancer, hip fractures and death due to other causes, resulting in a small but statistically significant increased risk for the global index of hazard ratios among women taking these hormones. The authors pointed out, however, that their study only evaluated healthy women, not those with symptoms of hormone deficiency. Furthermore, other routes of delivery, e.g., transdermal systems, need to be studied, since it is possible that transdermal delivery may increase benefits and/or decrease risks to these patients. It was noted by the authors of the WHI study that hormone replacement therapy is still considered to be effective for relieving perimenopausal symptoms such as hot flashes.
Most clinical trials evaluating sex hormone replacement therapy have focused on estrogens and progestins, although testosterone replacement therapy in women who may be testosterone deficient is now beginning to be addressed using transdermal delivery systems, e.g., for disease states in which there is stress from chronic disease with loss of muscle mass and chronic fatigue, such as wasting syndrome in women with AIDS (Miller, K. et al., 1998. J. Clin. Endocrinol. Metab. 83:2717-2725; Javanbakht, M. et al., 2000. J. Clin. Endocrinol. Metab. 85:2395-2401). Testosterone replacement therapy using transdermal delivery has also been of benefit to men with symptoms of testosterone deficiency, for example in men with Parkinson's disease (Okun, M. S. et al., 2002. Arch. Neurol. 59:1750-1753). There is accumulating evidence that the sex hormones, in particular estrogens, progestins and now testosterone, are important for subjective feelings of well-being and quality of life, parameters that were not assessed in the Women's Health Initiative trial.
U.S. Pat. No. 5,935,949 discloses a method of alleviating the symptoms of fibromyalgia syndrome and chronic fatigue syndrome which involves oral administration of androgens, such as testosterone, to patients. The idea behind the use of testosterone therapy in the treatment of such conditions is that muscle pain and chronic fatigue, primary symptoms in women with fibromyalgia syndrome (FMS), relates, at least in part, to testosterone deficiency, since androgens are known to allow for increased musculature and improvement in fatigue. Indeed, a small decrease in serum free testosterone concentrations has been documented for premenopausal fibromyalgia patients relative to healthy volunteers, but significance was not achieved for postmenopausal women (Dessein, P. H. et al., 1999. Pain 83:313-319). A relationship between testosterone and pain sensation has been previously suggested (Blomqvist, A. 2000. Compar. Neurol. 423:549-551). Accumulating evidence supports the concept that sex hormones can elevate the pain threshold in an individual, for example, during pregnancy (Gintzler, A. R. 1980. Science 210:193-195), when testosterone concentrations, as well as estrogen and progesterone concentrations, are elevated (Bammann, B. L. et al., 1980. Am. J. Obstet. Gynecol. 137:293-298). The theory that testosterone can suppress pain is supported by the discovery of aromatase-positive cells in the spinal cord dorsal horn of higher vertebrates (quail), where initial processing of pain sensation occurs (Evrard, H. et al., 2000. J. Compar. Neurol. 423:552-564). The presence of aromatase, which converts testosterone to 17.beta.-estradiol, is interesting because it is known that estrogen can induce the transcription of opiates in estrogen receptor-positive cells derived from the superficial layers of the spinal dorsal horn (Amandusson, A. et al., 1996. Neurosci. Lett. 196:25-28; Amandusson, A. et al., 1996. Eur. J. Neurosci. 8:2440-2445; Amandusson, A. et al., 1999. Pain 83:243-248), a location that is important for the synthesis of endogenous opiates. Administration of estrogen to ovariectomized female rats has been demonstrated to increase spinal cord enkephalin transcription (Amandusson, A. et al. 1999. Pain 83:243-248), and estrogen receptor-positive cells co-localize with preproenkephalin mRNA (Amandusson, A. et al., 1996. Eur. J. Neurosci. 8:2440-2445). These endogenous opiates act on enkephalinergic neurons to mediate inhibition of nociceptive relay cells, both in primary afferent fibers as well as in pain-modulating fibers descending from the brainstem (Ma, W. et al., 1997. Neuroscience 77:793-811). Thus, both testosterone and estrogen appear to be important for modulating the sensation of fibromyalgia-related pain. However, the differential importance of androgens versus estrogens in pain sensation relative to gender remains poorly understood.
Testosterone may also act at the level of the brain. Testosterone concentrations were dramatically decreased in the brain and spinal cord of rats in response to pain-inducing subcutaneous injections of formalin into the paw. In these animals, the loss of testosterone in the central nervous system was demonstrated to be due to its metabolism by 5.alpha.-reductase to dihydrotestosterone (Amini, H. et al., 2002. Pharmacol. Biochem. Behav. 74:199-204). These authors pointed out that dihydrotestosterone can be metabolized to 5.alpha.-androstane-3α,17β.-diol, which is an effective modulator of GABAA receptor complexes in the brain. GABAA receptors are found throughout the brain, and actions of GABAA receptor modulators in the limbic system, specifically in the amygdala, are associated with feelings of fear. The GABAA receptor ion channel complex is one of the most important inhibitory ion channels in the brain. Thus, testosterone may be important not only for modulation of fibromyalgia-related pain but also for feelings of emotional well-being via binding of its metabolites to the neurosteroid site of the GABAA receptor, although this remains to be demonstrated.
Other hormones such as growth hormone may also play a role in the pathogenesis and symptoms of fibromyalgia and chronic fatigue. For example, studies have shown that fibromyalgia patients fail to exhibit a proper growth hormone response to acute exercise, a response that is likely related to increased levels of somatostatin a powerful inhibitor of growth hormone synthesis (Crofford, L. J. et al., 2002. Arthr. Rheumat. 46:1136-1138; Paiva, E. S. et al., 2002. Arthr. Rheumat. 46:1344-1350). It is well known that testosterone increases growth hormone secretion. Growth hormone secretion is reduced in senescence beyond the reduced levels of secretion seen in adult life after puberty. This reduction is thought to relate to the decreased lean body mass to adipose mass ratio known to occur in some individuals in senescence. Thus, increased somatostatin levels may reflect decreased anabolism and decreased muscle mass due to decreased testosterone and growth hormone concentrations in fibromyalgia patients. As a result, therapy with growth hormone may improve the condition of patients with fibromyalgia.
It has now been found that transdermal hormone therapy in women can safely and effectively raise serum hormone concentrations to levels that approximate those normally found in premenopausal women, as well as relieve symptoms in patients with fibromyalgia.
An object of the present invention is a composition for increasing androgen levels in blood which comprises an androgen at a concentration of about one percent and a pharmaceutically acceptable gel. The androgen compounds of the instant invention may comprise testosterone and its derivatives.
Another object of the present invention is a method of alleviating the symptoms of fibromyalgia syndrome and chronic fatigue syndrome which comprises administering to a patient suffering from fibromyalgia syndrome or chronic fatigue syndrome an effective amount of the androgen gel formulation so that the symptoms are alleviated.
The invention relates to a method of alleviating the symptoms of a condition which is associated with deficient serum androgen levels in a female human patient comprising transdermally administering daily to said patient suffering from deficient serum androgen levels a safe and effective amount of an androgen which is both effective for alleviating the female patient's condition associated with androgen deficiency and for consistently raising the female patient's serum androgen levels to the middle-upper female reference range female reference range, wherein the composition contains a daily unit dose of an androgen and is formulated to provide steady state total androgen serum levels without raising free androgen serum levels or twenty-four hour free androgen AUC above the levels required for both therapeutic efficacy and safety.
The invention also relates to a method of determining the appropriate androgen dosage for a female human subject comprising diagnosing the female human subject as having fibromyalgia or chronic fatigue syndrome accompanied by a free androgen level in the lower half of the appropriate reference range; starting transdermal androgen treatment of the subject based on a diagnosis of fibromyalgia or chronic fatigue syndrome. After a predetermined time of treatment the free androgen level in the subject's blood is measured. If the subject's free androgen level remains in the lower half of the appropriate reference range, the androgen dosage is increased; if the subject's free androgen level is within the middle-to-upper end of the appropriate range, the androgen dosage is maintained; or if the subject's free androgen level is in excess of at least about 15% of the appropriate reference range, the androgen dosage is decreased. The predetermined treatment time can be 30 days, 60 days, 4 weeks, 8 weeks or any other time desired by a physician treating the subject. The method can be repeated several time over the course of treatment
The syndrome of chronic fatigue has received much attention lately. No physical finding or laboratory test can be used to confirm diagnosis of chronic fatigue syndrome. However, this syndrome is generally characterized by fatigue persisting or relapsing for more than six months occurring concurrently with at least four or more of the following symptoms: impaired memory or concentration, sore throat, tender cervical or axillary lymph nodes, fibromyalgia-related muscle pain, fibromyalgia-related multi-joint pain, new headaches, unrefreshing sleep, and post exertion malaise. Early studies suggested an infectious or immune dysregulation mechanism for the pathophysiology of chronic fatigue syndrome. More recent studies have shown that neurologic, affective and cognitive symptoms also frequently occur.
Fibromyalgia (also referred to as fibrositis) is one of the most common rheumatic syndromes in ambulatory general medicine affecting 3-10% of the general population. Most patients with Fibromyalgia Syndrome (FMS) are women, and of these patients, approximately 50-75% are women in their peri-postmenopausal years, aged 40-60. Approximately 2-5% of peri/post menopausal women are affected by FMS, with some estimates ranging from 0.5 to 20%. This disease is characterized by chronic widespread fibromyalgia-related musculoskeletal pain syndrome with multiple tender points, fatigue, headaches, lack of restorative sleep and numbness. Fibromyalgia shares many features with chronic fatigue syndrome including an increased frequency in peri/post menopausal woman, absence of objective findings and absence of diagnostic laboratory tests. Further, these conditions have overlapping clinical features including chronic fatigue, headaches and lack of restorative sleep with musculoskeletal fibromyalgia-related predominating in fibromyalgia and apparent increased susceptibility or hyperimmunologic responsiveness to infection predominating in chronic fatigue syndrome.
Various treatments for chronic fatigue syndrome including acyclovir, oral and vaginal nystatin and fluoxetine have been tried with little success. Placebo-controlled trials have demonstrated modest efficacy of amitriptyline, fluoxetine, chlorpromazine, or cyclobenzaprine in treating fibromyalgia. Exercise programs have also been suggested as beneficial in both conditions. Accordingly, there is clearly a need for better treatments for these debilitating conditions.
It has now been found that transdermal administration of hormones, including androgens, can alleviate symptoms in patients suffering from FMS or CFS. By “androgen therapy” it is meant to include administration of a single androgen or a combination of androgens. By “alleviate” it is meant to make less hard to bear, reduce or decrease, or lighten or relieve patients of the symptoms of FMS of CFS. By “symptoms” of FMS or CFS it is meant to include fibromyalgia-related muscle pain and atrophy, chronic fatigue, lack of restorative sleep, increased susceptibility to infection and headaches resulting from FMS or CFS.
The invention relates to a method of alleviating the symptoms of a condition which is associated with deficient serum androgen levels in a female human patient comprising transdermally administering daily to said patient suffering from deficient serum androgen levels a safe and effective amount of an androgen which is both effective for alleviating the female patient's condition associated with androgen deficiency and for consistently raising the female patient's serum androgen levels to the middle-to-upper range of the female reference range, wherein the composition contains a daily unit dose of an androgen and is formulated to provide steady state total androgen serum levels without raising free androgen serum levels or twenty-four hour free androgen AUC above the levels required for both therapeutic efficacy and safety.
The invention also relates to a method of determining the appropriate androgen dosage for a female human subject comprising diagnosing the female human subject as having fibromyalgia or chronic fatigue syndrome accompanied by a free androgen level in the lower half of the appropriate reference range; starting transdermal androgen treatment of the subject based on a diagnosis of fibromyalgia or chronic fatigue syndrome. After a predetermined time of treatment, for example 15-30 days, the free androgen level in the subject's blood is measured. If the subject's free androgen level remains in the lower half of the appropriate reference range, the androgen dosage is increased; if the subject's free androgen level is within the middle-to-upper end of the appropriate range, the androgen dosage is maintained; or if the subject's free androgen level is in excess of the standard error of the mean above appropriate reference range, the androgen dosage is decreased. The predetermined treatment time can be from 1-6 weeks, determined by a physician treating the subject. The predetermined time can be 30 days, 40 days, 4 weeks, or any time frame determined by the physician. The method can be repeated several times over the course of treatment, so that the appropriate dose of the androgen can be adjusted to avoid side effects.
Most trials involving hormone replacement therapy have used derivatives of hormones naturally found in women. These derivatized hormones have been promoted because of their patentability and their extended half life. Androgens are no exception since the androgen hormone most prescribed for women is methyltestosterone, where methylation at the C-17 position increases its oral bioavailability. Patients do not tolerate these derivatized hormones very well, however. Non-derivatized exogenous hormones that are structurally identical to endogenous hormones have short plasma/serum half lives that range from 10-100 minutes, making oral administration of native hormones problematic. Investigators have begun to develop transdermal delivery systems, which provide sustained delivery while minimizing hepatotoxicity. A testosterone skin patch has been effective in HIV seropositive women with wasting syndrome (Miller, K. et al., 1998. J. Clin. Endocrinol. Metab. 83:2717-2725; Javanbakht, M. et al., 2000. J. Clin. Endocrinol. Metab. 85:2395-2401), but the skin patch causes topical skin irritation in many women, making its use problematic.
The present invention involves use of a testosterone formulated as a gel in a concentration that is appropriate for women. The data have shown this formulation to provide effective systemic delivery of testosterone in patients with fibromyalgia. 28 days of therapy with 0.75 g 1% (w/w) testosterone gel per day raised serum concentrations of total and free testosterone in fibromyalgia patients to concentrations approximating those in premenopausal women. At this dose, patients showed significantly decreased fibromyalgia-related muscle pain, decreased stiffness, decreased fatigue and increased libido in response to testosterone therapy. Fibromyalgia-related tender point pain was decreased, as well. These results, from both the pharmacokinetic and fibromyalgia-related pain assessment standpoints, support the use of testosterone replacement therapy to treat individuals with fibromyalgia syndrome.
Accordingly, androgen therapy provides a useful means for alleviating symptoms associated with FMS or CFS in women preferably of peri/post menopausal age. By peri/postmenopausal age it is most often meant to be approximately 40 to 60 years of age. Women outside of this range may also benefit since these syndromes have been known to be present in women 20 to 60 years of age. In a preferred embodiment, the androgen administered comprises testosterone, an active metabolite of testosterone such as dihydrotestosterone or androstenedione or a testosterone derivative such as methyltestosterone, testosterone enanthate or testosterone cypionate. Examples of available pharmacologic preparations of androgens believed to be useful in this invention include, but are not limited to danazol, fluoxymesterone, oxandrolone, methyltestosterone, nandrolone decanoate, nandrolone phenpropionate, oxymethalone, stanozolol, methandrostenolone, testolactone, pregnenolone and dehydroepiandrosterone (DHEA).
In the present invention, the androgens are administered transdermally in a gel formulation. This formulation has advantages over current oral methods as well as transdermal patch methods that include improved bioavailability and a low side effect profile. In a preferred embodiment, a combination of androgens such as testosterone or a testosterone derivative and DHEA can be administered to alleviate both the muscular and neurological symptoms of FMS or CFS.
As will be obvious to those of skill in the art upon this disclosure, other pharmaceutically acceptable androgen therapies can be considered. However, effective amounts and routes by which the androgen or combination of androgens can be administered amount to a significant challenge based on the number of failures in this field. Finding the right amount, formulation, and route for human use and then proving the safety and efficacy of the formulation has been a major challenge for those skilled in the art based on their experience with androgen therapies.
Generally, the androgen used in the invention is a biologically active androgen. Androgens may be active in their native state, and/or may be a precursor or pro-drug that is metabolized to a active state upon delivery to the subject. The androgen may be, but is not limited to, testosterone, androstenedione, androstendiol, dehydroepiandrosterone, danazol, fluoxymesterone, oxandrolone, nandrolone decanoate, nandrolone phenpropionate, oxymethalone, stanozolol, methandrostenolone, testolactone, pregnenolone, dihydrotestosterone, methyltestosterone, androgen precursors, or testosterone esters.
Administration of an androgen that achieves blood levels outside the reference range can result in adverse effects. Females are especially susceptible because their normal blood levels are one tenth those of males. Levels in excess of the upper limit of the reference range+/−SEM can cause, for example, hirsutism, acne, rapid (and sometimes permanent) changes in voice, emotional changes, and the more serious side effects of heart disease, cancer, and liver disease. Examples of these changes and side effects are discussed below.
It is desirable to maintain a patient's androgen blood levels within the middle to upper portion of the appropriate reference range. If androgens are administered in excess, clinical symptoms of androgen excess can appear. These symptoms can range from upsetting to dangerous. Generally, the symptoms of androgen excess include, but are not limited to, excessive and abnormal hirsutism, increased moodiness, anger, adverse lipid changes, abnormal liver function, weight gain, acne, alteration of libido, edema, functional and structural liver damage, cancer, permanent changes in voice, emotional changes, and diabetes.
For assessing safety, female patients will be dosed adjusted such that the “upper limit of the reference range for free testosterone” is defined as less than or equal to “about” 3.3 pg/mL when using the DSL free testosterone blood level assay (Table 1); and less than or equal to “about” 19 pg/mL when using the Mayo Medical Labs free testosterone blood level assay. If using another test with its own reference range, a person of skill would assess safety blood level limits in a equivalent way.
High testosterone levels above the reference range have been shown to result in the harmful effects of testosterone. Females with virilizing ovarian tumors provide a good example. Regnier et al., (2002 J. Clin. Endocrinol. Metab. 87(7): 3074) disclose a case study of a woman having a virilizing ovarian tumor (one that secretes testosterone and results in hyperandrogenism in about 80% of cases), with hirsutism that got progressively worse over time. Her total testosterone level was between 3.9 ng/mL and 7.0 ng/mL, which is above the reference range for females. Once the tumor was removed, her testosterone level returned to normal, the hirsutism subsided, and the hyperandrogenism did not recur.
It has also been shown that women with certain conditions, including breast cancer, have a total testosterone level higher than the reference range for women. For example, it has been shown that post-menopausal breast cancer patients can have a total testosterone level of about 1.55 ng/mL, which is above the reference range. Women with testosterone levels of over 1.55 ng/mL have a four-fold greater chance of developing breast cancer. (Ho et al., 2009 Singapore Med. J. 50(5):513).
Further, female-to-male (FTM) transsexuals, who are dosed with testosterone such that their blood levels reach male levels, i.e., >300 ng/dL (>3 ng/mL) have been studied for the safety of these levels in these genotypic females. Jacobeit (2009 Eur. J. Endocrinol. 161: 795) discloses dosing females to achieve stable serum testosterone levels within the eugonadal male reference range of about 620+/−130 ng/dL (6.2+/−1.3 ng/mL) for 36 months. Gooren et al., (2008 J. Sexual Med. 5: 765) teaches that the female-to-male transsexuals receiving doses of testosterone at or above the male reference range develop hirsutism and male-like increased risk for cardiovascular disease and diabetes. Bachmann et al. (2002 Fertil. Steril. 77(4): 660) teach that testosterone and other androgens have many detrimental side effects. Specifically, testosterone can cause acne, weight gain, excess hair, increased anger, adverse lipid changes, and abnormal liver function. Franke et al. (1997 Clin. Chem. 43(7): 1262) disclose that over-administration of anabolic steroids can cause many health problems, including weight gain, acne, hirsutism, alteration of libido, edema, function and structural liver damage. Finally, testosterone and other androgens are Schedule C-III controlled substances under the Anabolic Steroid Control Act and, as such, can be dangerous to over-administer in view of the dangerous side-effects of cancer, liver disease, and cardiac disease.
All of the above studies show the challenge to treating both women and men with testosterone or other androgens. It is of great importance to make sure that the dosage administered to women and men brings the androgen level to the proper and appropriate range, or the equivalent safe and effective range based on the detection assay used (see Table 1).
By “safe,” it is meant that blood levels are not raised significantly above the upper end of the reference range. By “effective,” it is meant that androgen therapy raises baseline blood levels from the lower half of the reference range to significantly higher blood levels that are still safe within the reference range. The therapy can raise the androgen blood levels from the baseline level to the middle or upper levels of the female reference range. While total testosterone is a factor when considering the blood levels of testosterone, it is the free testosterone that is an indicator of the testosterone that is available for biologic action in vivo. Further, free and bioavailable testosterone generally remain in a constant ratio and are reliable indicators of biologic availability, while SHBG-bound testosterone, which is not bioavailable, varies in response to changes in the total pool (Felig, P. and L. A. Frohman “Endocrinology and Metabolism” McGraw Hill, 4th edition, 2001 p 647).
The reference ranges for women and men differ by about ten times. Table 1 below, which shows the reference ranges for both women and men, and measured by two different detection means (male reference ranges only shown using one testing method). For example, the Diagnostic Systems Laboratories (DSL) reference range for women is about 0.1 ng/mL to about 1.0 ng/mL. The reference range determined using the Mayo Medical Laboratories diagnostic test is from about 0.08 ng/mL to about 0.6 mg/mL. The reference range for men, as calculated using the Mayo Medical Laboratories diagnostic test is about 2.4 ng/mL to about 9.5 ng/mL. It is important to remember that, when comparing serum testosterone reference ranges, one must translate the reference range from one test to another. One of skill in the art would know that diagnostic tests vary in their reference ranges, according to which, and whether, monoclonal antibody (mAb) was used for detection (earlier detection systems such as DSL use a detection mAb), or whether no mAb was used for detection (more recently developed detection systems such as Mayo Medical Labs, which use tandem mass spectrometry for inspection instead). Thus, the upper end of a safe total testosterone blood level range would be at about 1.0 ng/dL when using the DSL test, versus about 0.6 ng/dL when using the Mayo Medical Labs test. The upper end of a safe free testosterone range would be at about 3.3 pg/mL when using the DSL test, versus about 19 pg/mL when using the Mayo Medical Labs test. Furthermore, the reference range is only an approximation of what would be the “normal” range in individuals, since the reference range would be skewed downward if the “control” population included significant data from subjects with a deficiency.
1Because reference ranges vary according to the antibody used in the test, the source of reference ranges used for the values in this table is indicated: DSL (Diagnostic Systems Laboratories); Mayo (Mayo Medical Laboratories), a common testing service in hospitals for testing TT, FT and BioT (analysis by tandem mass spec after AmSO4 precipitation). Claims based on the reference range from an antibody detection test such as DSL must be converted to the Mayo Medical Labs reference range, which does not rely on antibody detection of testosterone, in order to make comparisons. The above table can be used for this purpose.
2Male testosterone levels are generally on the order of 10x female testosterone levels; Free testosterone is on the order of 1-5% of total testosterone.
In one embodiment of the invention, and for both the method of treating fibromyalgia-related pain in a female human, the androgen can be transdermally administered in a daily unit dose of about 0.1 mg to about 12.8 mg of the androgen in a pharmaceutically acceptable carrier formulated for daily topical administration as a gel and wherein the gel is formulated to deliver steady state total androgen serum levels without raising free androgen serum levels or twenty-four hour free androgen AUC above the levels required for therapeutic efficacy and safety. Preferably, the daily unit dose of the androgen is from about 1.0 mg to about 12.8 mg. More preferably, the daily unit dose of the androgen is from about 2.5.0 mg to about 10.0 mg. More preferably, the daily unit dose of the androgen is from about 3.2 mg to about 9.6 mg. Even more preferably, the daily unit dose can be from about 4.4 mg to about 9.6 mg. Most preferably from about wherein the daily unit dose of the androgen is from about 6.0 mg to about 8.0 mg. The daily unit dose of the androgen can be about 6.5 mg or about 7.5 mg.
In another embodiment, the dosing range can be incremental. For example, the dose to be administered to a female subject can be about 2.5 mg; 5.0 mg; 7.5 mg; or 10.0 mg. In order to determine the most appropriate dosage for a particular subject, a physician may start the patient on a low dose, and titrate the dose upwards until an dose that is both effective and safe is reached. In yet another embodiment, the incremental dosage rate can start at 3.2 mg, and rise progressively to 6.4 mg, 9.6 mg, and 12.8 mg, using a 0.8% gel formulation. For example, patients can be started with 2 packets of 0.8% testosterone or placebo gel per day for the first four weeks. Each packet can contain 400 mg of 0.8% testosterone gel (3.2 mg testosterone, to deliver 10% or 320 μg bioavailable testosterone) or 400 mg Placebo gel in it. After four weeks, any patient who tests>3.3 pg/mL for serum free testosterone (testosterone blood levels above the reference range), can decrease the dose by one gel packet/day. Any patient who tests≦0.9 pg/mL for serum free testosterone (at the low end of the testosterone reference range) can increase dose by one gel packet/day until the blood level is raised to near the mid-range or near the upper end of the reference range.
The daily unit dose can be delivered via a transdermal gel having about 0.1% to about 10.0% of the androgen. Preferably, the transdermal gel can have about 0.5% to about 5.0% of the androgen. More preferably, the transdermal gel can have about 0.5% to about 2.5% of the androgen. Most preferably, the transdermal gel can have about 0.8-1.0% of the androgen.
In another embodiment of the invention, and for treating fibromyalgia-related pain in a female human subject, the daily unit dose of the androgen may be selected to maintain steady state total androgen serum levels within a range of between about 0.7 ng/mL and about 1.6 ng/mL, and preferably between about 0.9 ng/mL and about 1.4 ng/mL for at least 24 hours after administration without raising free androgen serum levels or twenty-four hour free androgen AUC above the levels required for therapeutic efficacy and safety. Further, the free androgen serum levels and twenty-four hour free androgen AUC should not be raised above levels required for therapeutic efficacy and safety.
Specifically, the free androgen serum levels can be raised to between about 1.0 pg/mL and about 3.5 pg/mL. (About 3.3 pg/mL using the DSL test is equivalent to about 19 pg/mL using the Mayo Medical Labs mass spectrophotmetry method of measuring free testosterone, Table 1. The upper end of the reference range is determined by which method of measuring free testosterone is used). The twenty-four hour free androgen AUC levels can be raised to between about 35.18 pg-h/mL and about 72.60 pg-h/mL; more preferably the free androgen serum levels can be raised to between about 2.00 pg/mL and about 3.3 pg/mL and the twenty-four hour free androgen AUC levels can be raised to between about 40 pg-h/mL and about 65 pg-h/mL The daily unit dose of the androgen can be from about 4.0 mg to about 10.0 mg, or from about 6.0 mg to about 8.0 mg. At 10% bioavailability for the androgen in the gel that is actually delivered to the blood, the daily unit dose-to-be-delivered of the androgen can be from about 0.4 mg to about 1.0 mg, or from about 0.6 mg to about 0.8 mg androgen.
The formulation can be prepared using a variety of pharmaceutically acceptable ingredients. For transdermal administration, the formulation can include, but is not limited to, the androgen, a penetration enhancer, an emulsifier, a gelling agent; a lubricant, a thickening agent, a buffer, an alcohol, and water. As will be evident to those of skill in the art upon this disclosure, other pharmaceutically acceptable androgen therapies can be used. Effective amounts and routes by which the androgen or combination of androgens can be administered in a safe and effective manner according to the present invention can also be used, such that safe and effective blood levels of androgen are obtained. The formulation will preferably be used at a unit dose of 800 mg gel of 0.8% testosterone (6.4 mg testosterone), and then, depending on blood levels at 4 weeks, adjusting down to 400 mg gel of 0.8% testosterone (3.2 mg testosterone), or adjusting up to 1200 mg gel of 0.8% testosterone (9.6 mg testosterone), to maintain the unit dose to achieve safe and effective blood levels. Administration of the composition of the invention results in a low side-effect profile and delivers a therapeutically effective daily amount of the androgen to the patient's serum over each 24 hour period to alleviate the patient's symptoms without causing androgenic side effects.
The composition of the present invention comprises, in addition to the aforementioned androgen/anabolic agent, co-treatment with a pharmaceutically effective amount of growth hormone elicitor or effector, either growth hormone or an agent that is known to release growth hormone in effective amounts, i.e., a growth hormone releasing agent (“GRF”). GRF is an acronym based on the existence of an endogenous hormone known as GHRH. Other agents include GHrelin or a growth hormone releasing peptide or analog (GHRP; GHRP-6, or hexarelin, His-DTrp-Ala-Trp-DPhe-Lys, and GHRP-2, or Dala-D-2-NaI-Ala-Trp-Dphe-Lys are examples), which have been shown to release effective amounts of growth hormone. The natural rhythm of growth hormone release from the pituitary gland results in release of insulin-like growth factor (IGF-1), which in general, is considered to be the causal agent that determines the course of hormonal regulation and balance in processes such as adipogenesis and myogenesis. The hormonal effector, then, for the purpose of this invention, is also prophetically considered to be any peptide or peptidomimetic agent that directly acts to release this secondary anabolic growth factor, (IGF-1), not necessarily through the intermediary route of secretion of growth hormone itself. Although the indirect growth hormone route is preferred to elicit IGF-1, the latter route to directly release IGF-1 also is included by example.
In another embodiment of the present invention, the composition comprises a pharmaceutically effective amount of a growth hormone or, more preferably, a growth hormone-releasing agent, or an elicitor of IGF-1 secretion, coupled with androgen treatment and such combined treatment being capable of counteracting the deleterious effects of aging, such as, for example, muscle weakness, body fat increases, and skin fragility in adults. Essentially any suitable growth hormone-releasing agent may be employed in combination with any androgen, preferably one such as testosterone that possesses strong anabolic activity. Other anabolic agents that are not thought of as androgenic agents, or do not possess maximal androgenic activity may be used, as long as they have appreciable anabolic activity. In fact, this invention anticipates, and includes as a prophetic example, those anabolic agents that may be completely devoid of androgenic activity. Examples of such growth hormone-releasing agents include: somatoliberins; growth hormone-releasing hormone active fragments, such as, for example, hGRF (1-29) amide and hexarelin (GHRP-6). Hexarelin is a growth hormone releasing peptide mimetic agent, i.e., it mimics the effects of growth hormone releasing peptide in the body and contains between 2 and 20 amino acids. In particularly preferred embodiments, more than one growth hormone-releasing agent may be used in combination. A preferred combination comprises growth hormone-releasing factor (GRF or GHRH) and a growth hormone releasing peptide or peptidomimetic (GHRP). This combination has been reported to act by separate mechanisms for the release of endogenous growth hormone, and the effects have been shown in some cases to be additive, or even, synergistic, working at a separate receptor often called the Ghrelin receptor, to differentiate it from the GHRH receptor. Since the GHrelin receptor has recently been elucidated, prophetically other ligands for this receptor are anticipated to be synthesized and/or discovered in the future, and these are included by example (Baldelli, R et. al., Endocrine 14 (1):95-99, 2001). These are often referred to as GHSs (growth hormone secretagogue).
The administration of a GH or IGF-1 secretagogue will reduce plasma androgen concentration in humans (Tapanainem J. et. al., Fertility and Sterility 58: 726-732). This effect increases the need for exogenous androgen, such as testosterone, to be also administered as a co-treatment to restore and amplify existing levels.
Other compounds are known to affect this system which is known as the hypothalamo-pituitary-hepatic axis for GH, among other terms. Prophetically, it is probable that other compounds involved in this hormonal regulatory system may play a role in indirectly or directly influencing and increasing levels of GH, IGF-1, or IGF-2, and may be administered in the context of this invention along with the androgenic supplementation to get maximal effects of the growth/anti-aging effects of such treatment. Other indications that may be treated besides fibromyalgia may be syndromes affecting the growth of individuals, including but not limited to pituitary dwarfism, conditions or syndromes that are well known to practitioners in the field of endocrinology, growth, and aging.
For the administration of the GH agents that are described in detail above, they may be administered by a variety of means. These agents may be administered separately from the androgen administration, using the modalities of intranasal, transdermal, parenteral (subcutaneous or intravenous), or oral (with or without permeation enhancement and preferably with enteric protection, since proteins and peptides may be degraded by gastric exposure). GH itself is most preferably administered by parenteral means in practice, because it is a large protein that is of limited stability and limited absorption. However, intranasal administration is also an acceptable means for this and other large proteins or peptides.
In addition to a separate delivery modality for the GH agent and the androgenic compound selected for treatment, the two may be combined in a single combination therapy. For example, both could be incorporated together in an oral form, tablet, or suspension, with the caveat that any proteinaceous agent is suitably protected from gastric degradation. Alternatively, the combination of agents may be administered intranasally in one unit through separate delivery chambers, known to those of skill in intranasal delivery, or together in the same liquid, semi-solid, or solid delivery form. For example, a microparticulate or nanoparticulate dry solid system could be administered intranasally. Or the combined agents could be both administered transdermally.
A clinical trial was performed to investigate the pharmacokinetics and efficacy of transdermal delivery of hormones for treatment of fibromyalgia, the data from which can be used to plan further studies relating to fibromyalgia-related pain. Women were recruited by institutional review board-approved advertising. Subjects aged 40-55 and diagnosed for fibromyalgia using American College of Rheumatology criteria (11/18 bilateral tender points above and below the waist, chronic fatigue, etc., (Wolfe, F. et al., 1990. Arthrit. Rheumat. 33:160-172) were selected for the study if they fit additional criteria. Women were included if, in addition to meeting all other criteria, they agreed to keep their medicines unchanged during the study (decreases in analgesics were permitted). Women taking hormone replacement therapy were enrolled if they agreed to come off hormone therapy at least 2 weeks prior to, and for the duration of, the study, in addition to meeting other eligibility criteria. Pre- or peri-menopausal women were required to have adequate alternative contraception, a negative pregnancy test, and treatment was started within the follicular (proliferative) phase of the menstrual cycle. Patients were included if they were willing to exercise 20 minutes a day, 5 days per week during therapy, to promote the effects of testosterone; this was a requirement put in place by the Institutional Review Board. It is noted that exercise can be difficult for fibromyalgia patients. It is predicted that exercise alone cannot provide the therapeutic benefit of testosterone replacement therapy; a placebo-controlled study will confirm this prediction.
In this study testosterone was formulated as a gel in a concentration that is appropriate for women, and showed effective systemic delivery of testosterone in patients with fibromyalgia. The patients received 28 days of therapy with 0.75 g 1% (w/w) testosterone gel once per day. Serum concentrations of total and free testosterone were raised in these fibromyalgia patients to concentrations approximating those in premenopausal women. At this dose, patients showed significantly decreased fibromyalgia-related muscle pain, decreased stiffness, decreased fatigue and increased libido in response to testosterone therapy. Fibromyalgia-related tender point pain was significantly decreased, as well. These very encouraging results, from both the pharmacokinetic and fibromyalgia-related pain assessment standpoints, support the use of testosterone replacement therapy to treat individuals with fibromyalgia syndrome in a formal double blind placebo-controlled study. Further, the conclusions of efficacy in patients with fibromyalgia syndrome in response to increased serum concentrations of testosterone parallel the positive outcomes found with testosterone replacement therapy in other populations with chronic fatigue and muscle wasting, e.g., AIDS and Parkinson's Disease.
Children, pregnant women, and women on hormone therapy, hormone contraceptives or infertility drugs were excluded. Women were excluded from the study if they reported undiagnosed vaginal bleeding, had a body mass index BMI>30, admitted to ethanol or illicit drug abuse, had active thrombophlebitis, breast cancer, hypertension (BP>160 systolic/95 diastolic with or without medication, after sitting 5 minutes), or major skin disease, acne or hirsutism.
Prior to enrollment, study patient blood was tested for the following general health criteria (exclusion criteria in parentheses): cardiac risk factors by lipid profile—total fasting cholesterol (>240 mg/dL), high density lipoprotein (<35 mg/dL), low density lipoprotein (>210 mg/dL), triglyceride (>300 mg/L); hepatic function by alanine aminotransferase (>1.5×N; normal at 0-40 U/L), alkaline phosphatase (>2×N; normal at 40-120 U/L), aspartate aminotransferase (>1.5×N; normal at 10-30 U/L), serum albumin (>N; normal at 3.2-5.2 g/dL), total bilirubin (>N; normal at 0.2-1.3 mg/dL), and direct (conjugated, soluble) bilirubin (>N; normal at 0.0-0.3 mg/dL); kidney function by blood urea nitrogen (>2×N; normal at 8-18 mg/dL) and serum creatinine (>N; normal at 0.7-1.2 mg/dL) tests; hematological function was assessed by complete blood cell count including testing for hemoglobin (normal; 12-16 g/dL).
Blood tests and physical exam at the end of the study were performed to assess whether testosterone therapy adversely affected the general health of the study patient. Serum total testosterone (>0.4 ng/mL) and FSH (<22 IU/L) were tested as well (8:00 AM after overnight fasting), to confirm patients had concentrations of testosterone in the lower half of the reference range (2 patients out of 18 were excluded based on testosterone concentrations) and to determine their post-menopausal status. FSH concentrations<22 IU/L indicated premenopausal or peri-menopausal status and thus the need for adequate contraception, unless the patient had undergone bilateral oophorectomy. Testosterone serum concentrations were tested at 8:00 AM due to the small circadian rhythm of circulating androgens. The most frequent exclusion criterion was for BMI>30. Patients were required to stop taking St. John's wort, since St. John's wort is known to induce catabolism of hormones by activating CYP3A, a detoxifying enzyme complex in the liver.
Written informed consent was obtained from study subjects prior to entry into the study. This consent process was ongoing throughout the study, and an independent Data Safety Monitoring board was in place for the duration of the study. Twelve patients who fit the eligibility criteria, above, were scheduled for physical exams including tender point assessment, verification of fibromyalgia diagnosis, and assessment of general health.
On day 1, blood was drawn by venipuncture at 0, 1, 2, 3, 4, 6, 8, 10, 12 and 24 hrs for 24 hr pharmacokinetic profiling of baseline testosterone serum concentrations. Testosterone gel, 0.75 g 1% w/w, was applied by the patients to their lower abdominal skin just after the zero time point blood draw (8:00 AM). The patients also filled out a fibromyalgia-related pain assessment questionnaire form and were given packets of testosterone gel for 8:00 AM daily application to lower abdominal skin, instructions for use and a patient medication log and exercise log for 28 days of therapy. On day 28, the blood draws for 24 hr pharmacokinetic profiling were repeated, and a follow-up exam was repeated at the end of the 28 days of therapy.
The delivery vehicle for this study was a gel formulation. A goal of the study was to identify a transdermal delivery system for hormones that would result in effective levels of hormones in blood as a way to reduce side effects of androgen therapy. The gel used for this study was a 1% w/w testosterone gel, USP grade. The once-a-day daily unit dose applied was about 7.5 mg testosterone; the expected bioavailability of 10%, industry standard for transdermal delivery, would deliver about 0.75 mg testosterone over 24 hr. The gel was formulated for women by Bentley Pharmaceuticals, Inc. (Exeter, N.H., a former division of CPEX Pharmaceuticals, Inc.) using good manufacturing practice standards, and is quick-drying, odorless, colorless, comfortable on the skin, and non-staining. Since testosterone is a Schedule C-III controlled substance under the Anabolic Steroid Control Act, all testosterone treatment samples were itemized and accounted for at the conclusion of the study.
Testosterone concentrations were determined by enzyme linked immunoassay (EIA, Diagnostic Systems Laboratories or DSL, Inc, Webster, Tex.), where serum testosterone from study subjects competed with enzyme-linked testosterone bound to anti-testosterone mAb. This assay system was designed to detect the lower concentrations of testosterone found in women as well as concentrations in the upper ranges. Free testosterone concentrations were determined by EIA using an anti-testosterone antibody that recognizes the unbound testosterone in the test sample, and has low affinity for sex hormone binding globulin and albumin. Reference ranges for the DSL detection system are given in Table 1 above. For the purposes of determining mean testosterone concentrations, times were based on the nearest hour. Of the 240 time points taken for the pharmacokinetic data (10 time points per individual×2 sets per individual×12 individuals), 1 time point was missed (4 hr point) and 3 additional time points were in between the standard times for taking blood (8 hr point; 4 hr and 10 hr points). Values for these time points were derived by interpolation for the purposes of deriving mean testosterone concentrations. A noncompartmental pharmacokinetic analysis using WinNonlin Pro (Pharsight, Mountain View, Calif.) used the exact time points recorded for all the patients.
In order to determine the efficacy of the treatment for reducing symptoms of fibromyalgia, patients filled out questionnaire forms on day 1 and again at the end of therapy on day 28 to assess fibromyalgia-related pain. The patient questionnaire was based on a published and validated Fibromyalgia Impact Questionnaire as well as other accepted criteria for fibromyalgia patient assessment (Wolfe, F. 1990. Arthrit. Rheumat. 33:160-172; Goldenberg, D. 1996. Arthrit. Rheumat. 39:1852-1859; Burckhardt, C. S. 1991. J. Rheumatol. 18:728-733), and used a 100 mm visual analog scale (VAS). Tender point exams were administered by a qualified rheumatologist experienced in treating women with fibromyalgia, and involved applying approximately 9 pounds of pressure at each tender point and asking whether the patient felt fibromyalgia-related pain. This practice is in accordance with criteria specified by the American College of Rheumatology. Exams were administered just prior to Day 1 of therapy (and therefore designated as “pretreatment”), and at the end of therapy. The pretreatment tender point assessment was performed on all patients within 1 week before the start of therapy. Dolorimeter readings were taken from the bilateral second costochondral junction and trapezius tender points, for comparison, in 11 of the 12 study subjects.
Pharmacokinetic analysis of serum testosterone concentration data was carried out using WinNonlin Pro software, using the noncompartmental model with extravascular input. Differences between Day 1 and Day 28 maximum plasma concentrations (Cmax) and area under the curve (AUC) of a plot of plasma concentrations over time were assessed by calculating individual subject Day 28 minus Day 1 data and estimating 95% confidence intervals of this difference to determine if significance (p<0.05) was reached. Tender point data evaluations were analyzed by Student's t test (paired, 2-tailed) after summing all 18 tender point values for each individual at baseline versus day 28 of the study.
Eighteen patients were screened and evaluated for enrollment in the study. Twelve fibromyalgia patients aged 40-55 who met the study eligibility criteria were enrolled for this study and treated. All patients were white Caucasian females. Patient demographics for age, height and weight are shown in Table 2 below.
Analysis of the blood testosterone concentration data revealed that serum total testosterone concentrations were reliably increased in fibromyalgia patients in response to testosterone gel hormone replacement therapy. Serum total testosterone concentrations versus time data for Day 1 and Day 28 are shown in
The day 1 zero time point for total testosterone confirmed that these patients initially had total testosterone concentrations in the lower half of the reference range. The mean serum concentration of total testosterone 24 hr after application of the first dose of hormone on Day 1 was significantly higher than the mean serum concentration for time zero on Day 1 (
Summary pharmacokinetic parameter analysis demonstrated significantly increased mean total testosterone maximum concentration in response to testosterone therapy: Cmax was 1.92 ng/mL±0.90 SD on day 28 compared with 1.21 ng/mL±0.71 SD on day 1, p<0.05 (Table 3 below). Significantly increased mean total testosterone area under the curve values (assessed over the 24 hr profiling time period) were also found: AUC was 28.75 ng-h/mL±13.91 SD on day 28 compared with 18.36 ng-h/mL±7.10 SD on day 1, p<0.05. The differential Cmax and AUC values for day 28 after subtraction of day 1 baselines are provided in the right panel of Table 3.
The pharmacokinetic data for total testosterone, all together, demonstrate that with therapy, mean serum total testosterone concentrations initially rose quickly over the first 3 hours and were then reliably sustained over time. In addition, mean serum concentrations were raised from the lower boundary of the reference range to about the upper end of the reference range for premenopausal women.
Low free testosterone concentrations in serum are raised to premenopausal concentrations in fibromyalgia patients in response to testosterone gel hormone replacement therapy.
Concentrations of free testosterone in serum were analyzed similarly to total testosterone, with the results shown in
These results were similar to the previous findings, but with the following particular findings. Two individuals had unusually high concentrations of free testosterone prior to, and throughout, the course of therapy despite normal total testosterone levels, suggesting serum interference with the free testosterone testing antibody in these two cases. (The only medication and/or supplement reported by both study subjects, and not by any other subjects, was ginger root, and the anti-depressant Trazodone was taken by both individuals. Preliminary data, from spiking the assay with ginger root or Trazodone, are consistent with interference by ginger root and/or Trazodone with the enzyme linked immunoassay for free testosterone: 1) for a proof-of-concept finding, others have shown that DHEA-S can interfere with testosterone immunoassays; 2) here, day 1, 0 hr baseline free testosterone blood levels were higher than was biologically reasonable and did not increase further with therapy; 3) these two individuals had low total testosterone baseline levels such that if the baseline free testosterone levels were real, a much larger fraction of the total testosterone would have been free testosterone than the normal 1-4%; 4) the free testosterone for these individuals was about 3-10× the reference range, a level that approaches the levels found in males; 5) these individuals would have been at high risk for hirsutism if these free testosterone blood levels were indeed so much higher than the reference range; and 6) this study excluded patients with hirsutism. For these reasons, these two outliers were deleted from the analysis). Individual profiles for the remainder of the patients showed concentrations that increased from the post-menopausal range to the premenopausal and upper post-menopausal reference range.
Summary pharmacokinetic parameter analysis showed a mean free testosterone Cmax of 4.69 pg/mL±2.17 SD on day 28 compared with 3.68 pg/mL±2.99 SD on day 1 (p>0.05) [adjust for outliers] and a mean free testosterone AUC of 71.38 pg-h/mL±45.76 SD on day 28 compared with 54.35 pg-h/mL+49.83 SD on day 1 (p>0.05) (Table 4). Free testosterone Cmax and AUC were increased with therapy, as evidenced by subtraction of the day 1 baseline from day 28 values, but statistical significance was not achieved [adjust for outliers] in these pharmacokinetic parameters due to the two individuals with exceptionally high free testosterone concentrations.
Testosterone gel therapy is associated with a statistically significant reduction in fibromyalgia-related tender point pain comparing scores at the beginning of therapy and at the end of therapy. These evaluations were conducted a rheumatologist, the results are shown in
Using a dolorimeter to assess fibromyalgia-related pain at the same office visit, pain responses were quantitated for the bilateral second costochondral junction and bilateral trapezius tender points (n=10).
A p value of p=0.17 for the dolorimetry data was derived using summed tender point values, similar to
Fibromyalgia-related pain parameters were also evaluated by patient questionnaire using a visual analog scale (VAS) from 0-10.
Libido (sex drive) was increased in response to testosterone treatment. Muscle pain, stiffness, fatigue upon awakening and tiredness were all decreased during testosterone treatment. For muscle pain, a defining symptom for fibromyalgia, 42% of patients had a greater than 50% improvement in fibromyalgia-related pain. Muscle pain VAS improvement was not dependent on whether the patient had previously had a clinical relationship with the study rheumatologist, and might therefore wish to please the doctor (data not shown).
These findings are consistent with the idea that restoration of premenopausal serum testosterone concentrations relieves symptoms that most specifically relate to testosterone deficiency, e.g., loss of sexual desire, loss of muscle function and increased fatigue. Indeed, patients reported decreased fibromyalgia-related muscle pain, decreased stiffness, decreased fatigue upon awakening, decreased tiredness, and increased libido. Blood tests and physical exam at the end of the study, including cardiac function, liver function and kidney function panel assessment, verified testosterone therapy did not adversely affect the general health of the study patient, and no study patient reported any adverse events that were attributable to the treatment.
Most trials involving hormone replacement therapy have used derivatives of hormones naturally found in women. These derivatized hormones have been promoted because of their patentability and their extended half life. Androgens are no exception since the androgen hormone most prescribed for women is methyltestosterone, where methylation at the C-17 position increases its oral bioavailability. Patients do not tolerate derivatized hormones very well, meaning that those hormones are not good candidates for commercialization. Non-derivatized exogenous hormones that are structurally identical to endogenous hormones have short plasma/serum half lives that range from 10-100 minutes, making oral administration of native hormones problematic. Investigators have begun to develop transdermal delivery systems, which provide sustained delivery while minimizing hepatotoxicity. A testosterone skin patch has been effective in HIV seropositive women with wasting syndrome (Miller, K. 1998. J. Clin. Endocrinol. Metab. 83:2717-2725; Javanbakht, M. 2000. J. Clin. Endocrinol. Metab. 85:2395-2401), but the skin patch causes topical skin irritation in about 30% of women, making its use problematic.
This example involves use of a testosterone formulated as a gel in a concentration that is appropriate for women. The data have shown this formulation to provide effective systemic delivery of testosterone in patients with fibromyalgia. 28 days of therapy with 0.75 g 1% (w/w) testosterone gel per day raised serum concentrations of total and free testosterone in fibromyalgia patients to concentrations approximating those in premenopausal women. At this dose, patients showed significantly decreased fibromyalgia-related muscle pain, decreased stiffness, decreased fatigue and increased libido in response to testosterone therapy. Fibromyalgia-related tender point pain was decreased, as well. These results, from both the pharmacokinetic and pain assessment standpoints, support the use of testosterone replacement therapy to treat individuals with fibromyalgia syndrome.
The following tables contain raw data from the study set forth above. For all these tables, the table patient numbering correlates with the Patient Study Identification Number as listed below. Patient Nos. 7 and 12 (010 and 016, respectively) are outliers with regard to their free testosterone level, and are taken into account as described in paragraph [0079].
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This study will be performed to confirm the results of the trial discussed in Example 1 above. The study will be employ a randomized, double blind placebo controlled design in eighty to one hundred patients. In the previous open label study of 12 patients, we tested the hypothesis that the fibromyalgia muscle pain and fatigue symptoms of women, aged 40-60 with Fibromyalgia Syndrome (FMS), are caused by abnormally low circulating levels of testosterone. Further, we tested the hypothesis that treatment of FMS patients with testosterone gel delivered transdermally will decrease the fibromyalgia-related pain and fatigue in these patients. The goals for this blinded efficacy study are very similar. Specifically, the goals are to conduct a placebo controlled study in FMS. for testosterone treatment for fibromyalgia-related pain and fatigue in FMS patients. Patients will be treated for 3 months, have a possible extension to 6 months, and will employ symptomatic FMS efficacy endpoints, as in Example 1.
This study will be performed to confirm the dose of testosterone gel that is appropriate for fibromyalgia subjects. The doses of testosterone gel used in the previous study approximate the blood levels expected for testosterone replacement therapy in Fibromyalgia Syndrome (FMS) patients. The drug dose is based on the testosterone gel treatment in the 12 patients, as discussed in Example 1. In our previous trial, FMS patients were on the drug for 28 days and were tested for serum testosterone levels pharmacokinetically over a 24 hr period both on day 1 and at the end of treatment on day 28. The dose of drug used for that study resulted in increased free testosterone serum levels that were largely within the reference range.
The planned study will be performed to confirm the safety of the dose of testosterone gel and the blood levels achieved with those doses. In this study, safety checks will take place at weeks 4, 8, and 12 to monitor the levels of testosterone in the blood. Dose reduction is an option if needed for safety purposes. A dose increase is an option, within the limitations of safety, if needed for efficacy.
This study will be performed to assess testosterone blood levels due to the testosterone treatment. The study will further continue to assess the interpatient variation of testosterone blood levels achieved at the doses of testosterone used and identify any remaining confounding factors when assessing testosterone levels.
The planned twelve-week research study will look at whether testosterone replacement therapy can lessen the symptoms of fibromyalgia over 3-6 months' time. Patients that are selected to participate in the study will receive either testosterone gel or placebo gel and undergo an evaluation and blood tests once every four weeks. In addition, study participants will complete patient questionnaires once every four weeks, take part in an exercise program and fill out daily medicine and exercise logs.
The target patients for this study will be 40-60 year old women who have been diagnosed as having fibromyalgia. The patients can be pre- or post-menopausal, but should not be using hormone therapy (or will be willing to cease such therapy). In addition, the patients should not use St. John's Wort, antidepressants, ginger root (or will be willing to cease such use). In addition, in order to be selected for the study, patients will be required to exercise at least 20 minutes per day, five days a week, including stretching and aerobic exercise (walking, running, bicycling, climbing stairs, etc.).
The physical examination used to select participants for the study will include a “tender point” examination, which tests the intensity of fibromyalgia-related muscle pain for each of the 18 commonly recognized tender points that fibromyalgia patients are known to have. The tender point examination will be repeated every four weeks.
Prospective study participants will be notified of the risks, and the likelihood of their occurrence. The risks include increased libido (likely to occur); deepening of the voice, increased facial hair, temporal balding, acne, menstrual irregularities, lipid abnormalities and heart disease; liver toxicity (unlikely to occur); and hepatocellular carcinoma (rare occurrence). Patients whose blood levels are maintained within the appropriate reference range for androgens are unlikely to have the toxicity risks associated with blood levels above the reference range.
This double blinded, placebo-controlled study with dose titration for safety (see below) is designed to show in a controlled study that testosterone replacement therapy results in decreased fibromyalgia-related pain and fatigue in women with Fibromyalgia Syndrome (FMS). Female patients aged 40-60 who have been diagnosed with FMS and meet other eligibility criteria will be considered for this Phase I/II study. A total of 80-100 outpatients will be enrolled, 40-50 for each arm, drug versus placebo, and with randomization to initial treatment versus placebo. Menstruating women will be started on drug within 10 days of their d1 of menses to initially control for reproductive endocrine state. A dose of testosterone gel, about 800 mg gel at 0.8% w/w testosterone/gel (about 6.4 mg testosterone; at the commonly accepted 10% bioavailability of drug in a gel=0.64 mg bioavailable testosterone, that is essentially equivalent to that previously determined by us as appropriate for women (about 750 mg gel of 1% w/w testosterone/gel) versus placebo gel, will be applied to the subject's abdominal skin at 0 hr on Day 1 (at 8:00 AM), and each morning thereafter once a day for 4 weeks. At 4 weeks, after serum testing for testosterone levels, gel will be adjusted upward from 800 mg to 1200 mg for patients whose levels remain in the low range (S about 1.9 pg/mL free testosterone, DSL test), and the gel will be adjusted downward from about 800 mg to about 400 mg for patients whose levels are high (>about 3.3 pg/mL free testosterone, DSL test). Serum will be tested again at 8 weeks and the dose readjusted similarly if necessary. Equivalent values will be used if Mayo Medical Labs testing is used.
This dose adjustment is important due to the individual variation we have found between FMS subjects in response to testosterone therapy. This variation could be due to variation in catabolism rates, SHBG affinity, etc. Our preliminary data (Example 1) allow us to predict that we can safely maintain subjects on a dose between 1-3 packets of about 400 mg/packet about 0.8% testosterone gel per day. Testosterone levels will be blinded to treatment staff and study investigators via use of a “Study Dosing Coordinator” who is distinct from the Study Coordinator. The three month open label (no placebo) continuation study may be extended to provide 6 month safety data for those patients originally on drug, and to allow patients on placebo to go on drug for 3 months. The dose will be adjusted similarly to how adjustments were made in the first 12 weeks, and we will use the same approach for testing.
To test for serum levels of testosterone (total and free), the study coordinator will take blood samples (7 mL) by venipuncture prior to the study (for eligibility) and at 4, 8, and 12 weeks (and at 16, 20, 24 weeks if the extension study is performed), between 8:00 and 9:00 AM prior to application of gel and after fasting since midnight the evening before. Estradiol will be tested at d1, 12 wks (and 24 wk if the extension study is performed) to rule out conversion from testosterone to estradiol in the circulation via aromatase. The limited data available indicates that no such conversion takes place. Subjects will be instructed to fast from midnight the evening before for all blood draws.
For general health parameters, pre-study baseline samples and end-of-study samples will be collected at screening (Visit 1), 12 weeks (and 24 weeks for the extension study) for standard test panels (see Appendix 1): cardiac health (Lipid Profile: total cholesterol, HDL, LDL, triglyceride), liver function (hepatic function panel: ALT, ALP, AST, albumin, TBil, DBil), kidney function (BUN, creatinine) and CBC (to obtain hemoglobin levels since androgens are known to stimulate the production of red blood cells by enhancing erythropoietin production. FSH will be tested at the screening phase to discriminate pre- and post-menopausal women and to allow for subgrouping in the analysis phase (high levels indicate the patient is postmenopausal). As noted previously, premenopausal women will be entered into drug treatment within 10d of d1 of menses to initially control for endocrine state.
Testing for total testosterone serum levels will be conducted, as well as for free testosterone serum levels. Testing for total testosterone is most frequently done due to its lower cost, but free testosterone levels allow for assessment of the biologically active compartment. Although free testosterone levels have been found to correlate well with total testosterone levels, both are required for full analysis and both will be tested here. Serum estradiol levels in these women were found to be well within the reference range. Dihydrotestosterone (DHT) will not be measured since testosterone is converted to DHT within cells, and testosterone is the norm for testing in women. DHT is dependent on testosterone levels and can be assumed to correlate with testosterone levels.
Sex hormone binding globulin (SHBG) reversibly binds testosterone resulting in a bioavailable form (bioavailable testosterone is composed of free testosterone+testosterone loosely associated with globulin) versus a non-bioavailable form (SHBG bound). Testosterone and its more form dihydrotestosterone have a higher affinity than estradiol for SHBG (Becker, p 938). Androgens can decrease the binding affinity of SHBG for hormone, resulting in an increased bioavailability of both 17beta-hydroxyandrogens (testosterone and DHT) and estradiol (Becker, p 837). Our testing of estradiol will allow us to determine how testosterone therapy affects serum estradiol levels in our subjects. Estrogen administration is associated with a decrease in bioavailable testosterone (Davis 1997). The patients studied here will not be on estrogen or any other hormone therapy at the time of testosterone therapy.
Testosterone formulated in about an 0.8% (w/w) hydroalcoholic gel by an FDA licensed manufacturer, at about 800 mg gel/day (see details under “Dose of testosterone gel” below), will be prescribed for transdermal delivery. The initial dose at about 800 mg will be adjusted to about 400 mg or about 1200 mg as specified above based on free testosterone serum levels tested at 4 week intervals. A packet-based or metered-dose method can be used to ensure delivery of an accurate quantity of gel. Other delivery systems can be contemplated as well, as long as the desired blood levels are met. The gel will be applied to abdominal skin, above the waistline, for transdermal delivery by percutaneous absorption. The gel dries in minutes and is colorless, comfortable and non-staining. The form of testosterone used will be USP grade material of a composition identical in potency to a currently marketed transdermal gel which is FDA approved for men with hypogonadism.
The gel proposed for this study will be similar in composition to the marketed gel, but packaged and titrated for a female dosage regimen. The gel will be compounded at an FDA-approved manufacturing site using GMP conditions appropriate for this stage of development, and will be monitored for stability for the duration of the study. The gel will be metered using a filled packet calibrated to deliver the required dose. The packets will be assembled in kits with the appropriate number of packets as determined by the Study Dose Coordinator, and with package insert instructions for the patient and scissors to snip the end of the packet.
Testosterone is a schedule C-III controlled substance as defined by the Anabolic Steroids Control Act. The materials must be produced under a DEA license. The amounts dispensed are insufficient for abuse potential, and the samples will be itemized and accounted for. All unused materials containing the scheduled substance testosterone must be returned to the Researcher at the end of the study.
A transdermal route of delivery should provide benefits to the patient beyond those found with oral delivery. The hormone is delivered over a more sustained time and at lower doses with improved bioavailability, thereby reducing the risk of hepatotoxic side effects. The injectable or transdermal (gel, patch) forms of hormone largely circumvent the possible hepatotoxicity issues associated with orally administered hormones. Currently, the oral route of delivery is the predominant route used by women on estrogen/progestin sex steroid hormone replacement therapy. Delivery of testosterone via gel should be superior to oral delivery. With regards to different vehicles for transdermal delivery, a testosterone patch is currently being studied in women for AIDS related wasting syndrome (Miller 1998, Javanbakht 2000). We prefer transdermal delivery via gel, rather than patch, which will avoid the local skin irritation experienced by patients using the patch system since ˜30% of patients get contact dermatitis with the patch (P&G's Intrinsa testosterone patch for the subset of female sexual dysfunction (FSD) called Hypoactive Sexual Desire Disorder (HSDD).
Relatively high doses of androgens were given to patients in the earliest studies by others. The current thinking is to use these drugs for amelioration of hormone deficiency at relatively low doses in an attempt to reconstitute normal levels. The planned study is in keeping with this minimalist rationale. To determine the appropriate dose for our previous pharmacokinetic study using FMS patients (Example 1), we estimated the dose of testosterone gel based on the FDA approved testosterone gel product. Our pharmacokinetic methodology was similar to that used for men in prior clinical trials.
All patients will be started with 2 packets of about 0.8% Testosterone or Placebo gel per day for the first 4 weeks. Each packet has 400 mg of 0.8% Testosterone gel (3.2 mg Testosterone, to deliver 10% or 320 μg bioavailable Testosterone) or 400 mg Placebo gel in it. The patient will be shown where to rub the gel on her abdomen. After the 4 wk blood draw, any patient who tests>3.3 pg/mL for serum free Testosterone (HiT, DSL test), decreases dose by 1 gel packet/d; any patient who tests≦1.9 pg/mL for serum free Testosterone (LoT, DSL test), increases dose by 1 gel packet/d. Equivalent cut-off levels will be used if Mayo Medical Labs testing is done instead. The decision to adjust the testosterone dose will be made again after the 8 wk blood draw. Our preliminary data allow us to predict that we can safely maintain subjects on a dose between 1-3 packets of 400 mg 0.8% testosterone/packet per day. In order to maintain the blind for the patient and the treating study staff, placebo patients will be split into three groups at week 4, with a third given 1 packet, a third maintained at 2 packets and a third given 3 packets of Placebo.
The trial will be scheduled for 12 weeks to start, with a possibility of extending the trial to a total of 24 weeks. If the study is able to be extended, all patients will receive open label testosterone starting at 12 weeks, with the 12 week time point serving as the baseline for the Placebo patients. Placebo patients will receive 2 packets of Testosterone gel for the next 4 weeks. Possible dose adjustment for these patients will take place after 16 weeks and again after 20 weeks, based on achieved free serum testosterone levels. Adjustments for all patients will be made based on the same criteria as described above for weeks 4 and 8. For the subjects who were on drug during the first 12 weeks, the additional 12 weeks of continuation will provide confirmation of efficacy and extended safety data. For the Placebo patients, the continuation study will ensure all patients in the study have a trial of active therapy.
The Study Coordinator or Study Resident will administer the FMS Preliminary Patient Questionnaire (
The physician will fill out a Physician Evaluation Form (
The study coordinator (or study designated resident) will administer a Patient Questionnaire Form (
An initial summary assessment of the patient's general health via standard physical exam will be noted on the Physician's General Health Form (
The Mannerkorpi functional movement test will be administered by the study coordinator prior to study for baseline, and at 12 wk (and 24 wk) at the end of study. This instrument was chosen because of its outstanding ability to discriminate between FMS subjects and a control group for range of motion and fibromyalgia-related pain perceived during range-of-motion testing using a VAS scale of 1-100 mm (Mannerkorpi 1999, P values at 0.0001 for pain perceived). This instrument has been validated for FMS patients.
Patients will also be followed for changes in blood pressure and weight. At the end of the study, analyses will be conducted to show: 1) the percentage of patients achieving>30% versus>50% improvement in their pain scores by VAS, 2) the percentage of patients in the active arm who would like to continue on with their same medication, 3) versus the percentage of patients in the placebo arm who would like to continue on with their same medication, 4) an analysis of use of pain relief network pain medication in both arms, and 5) an analysis of dropouts due to lack of efficacy from both arms. The patients will be required to complete the examinations, questionnaires, blood draws, study gel logs (
Other forms that can be administered by the physician or Dose Coordinator for this study include the FMS Movement Test Form (
Having now fully described the invention, it will be understood by those of ordinary skill in the art that the same can be performed within a wide and equivalent range of conditions, formulations and other parameters without affecting the scope of the invention or any embodiment thereof. All patents, patent applications, and publications cited herein are fully incorporated by reference in their entirety.
This application is a continuation-in-part of U.S. patent application Ser. No. 12/837,310, filed Jul. 15, 2010, which application is a continuation of U.S. patent application Ser. No. 11/303,813, filed Dec. 16, 2005, now U.S. Pat. No. 7,799,769 B2, which application is a continuation of U.S. patent application Ser. No. 10/464,310 filed Jun. 18, 2003, abandoned. Each of these applications is incorporated herein by reference in its entirety.
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US2011/061256 | 11/17/2011 | WO | 00 | 10/4/2013 |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11303813 | Dec 2005 | US |
| Child | 12837310 | US | |
| Parent | 10464310 | Jun 2003 | US |
| Child | 11303813 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12949644 | Nov 2010 | US |
| Child | 13988259 | US | |
| Parent | 12837310 | Jul 2010 | US |
| Child | 12949644 | US |
