Patent Application
20080220068
The present invention relates to the treatment and prevention of excessive scarring, such as is manifested by keloid and hypertrophic scars, with a composition that comprises a hydration agent and an anesthetic.
Keloid scars or “keloids” are overgrowths of dense fibrous tissue that result from variations in normal wound healing. The dense fibrous tissue of a keloid extends beyond the borders of the original wound, and usually does not regress spontaneously. Thus, keloid scarring is out of proportion to the severity of the inciting wound.
Likewise, hypertrophic scars are overgrowths of dense fibrous tissue that result from abnormal wound healing. In contrast to keloids, hypertrophic scars do not extend beyond the original boundaries of a wound. Also unlike keloids, hypertrophic scars typically reach a certain size and then stabilize or regress.
The normal wound healing process extends over a one to two year period, and conceptually consists of three distinct stages. The first stage, the inflammatory stage, is intensely degradative. It begins immediately after injury and provides a means to remove damaged tissues and foreign matter from the wound. A few days after injury, the second stage, the proliferation and matrix synthesis stage, begins. During this stage, fibroblasts from surrounding tissues move into the wound and proliferate. The fibroblasts actively produce collagen, which they secrete into the extracellular matrix. Newly synthesized collagen forms cross-linked fibrils, which provide structural integrity to the wound. After several weeks, the final stage, the remodeling stage, begins. During the remodeling stage, the collagen fibrils, which previously were randomly oriented, align in the direction of mechanical tension, providing further mechanical strength to the wound. Upon completion of the entire process, the skin regains its chemical and physical barrier functions.
Six to eight weeks into the normal wound healing process, anabolic and catabolic processes reach an equilibrium. At this time, scar strength is approximately 30-40% that of healthy skin, and scars typically are hyperemic and thickened. Over the next several months, catabolic and anabolic processes abate, and progressive cross-linking of collagen fibers improves the wound's tensile strength. Also, hyperemia and thickness subside until a flat, white, pliable mature scar develops.
Excessive scarring results from an imbalance in the anabolic and catabolic wound healing processes. In the formation of an excessive scar, more collagen is produced than is degraded. As a result, the scar grows larger than is required for wound healing, with an over-production of cells, collagen and proteoglycan. Keloids grow in all directions, become elevated above the skin, and remain hyperemic. The exact mechanisms of excessive scarring are poorly understood, but it is believed that common mechanisms underlie the formation of both keloids and hypertrophic scars. Evidence suggests that increased transforming growth factor β1 (TGF-β1) expression plays a role in excessive scarring. TGF-β1 promotes extracellular matrix production, and is produced at elevated levels by keloid fibroblasts.
Keloids and hypertrophic scars primarily present a cosmetic concern but can cause contractures, which may result in a loss of function if overlying a joint. Additionally, excessive scars can be painful, pruritic, bear a different pigmentation than surrounding skin and cause a burning sensation. Once keloid lesions occur, they tend to continue growing for weeks to months, even for years. Growth usually progresses slowly, but keloids occasionally enlarge rapidly, even tripling in size within months. As noted above, hypertrophic scars tend to stabilize and regress over time. This regression can be quite slow, however, and often is incomplete.
Management of keloids and hypertrophic scars remains a major unsolved clinical problem. Though many forms of treatment have been used, none has proven to be consistently reliable. Current forms of treatment include use of occlusive dressings, compression therapy, intralesional corticosteroid injections, radiation therapy, and surgery. Experimental therapies for keloids use calcium antagonists, antihistamines, interferons alpha and gamma, topical retinoids, and antiallergic drugs, but whether these experimental therapies are effective is debatable. Studies of them largely are characterized by poor objective response criteria, unknown mechanisms of action and lack of adequate patient follow-up.
Occlusive dressings, such as silicone gel sheets, and pressure devices are unpredictable forms of treatment, as a large percentage of patients treated by these means show little or no improvement. Additionally, compliance with these forms of treatment can be impractical. For example, dressings and pressure devices may need to be worn 24 hours per day for up to 12 months. For a scar on a visible or sensitive location, this simply may not be possible.
Intralesional corticosteroids have been the mainstay of keloid treatment. Corticosteroids reduce excessive scarring by reducing collagen synthesis, altering glycosaminoglycan synthesis, and reducing production of inflammatory mediators and fibroblast proliferation during wound healing. However, roughly half of all keloids fail to respond to corticosteroids, and roughly half of the scars that are completely resolved by corticosteroid treatment recur. Additionally, corticosteroid injections can cause several complications, including atrophy, telangiectasia formation, and skin depigmentation.
Radiation therapy may be the only predictably effective treatment for keloids that is presently available. It has the potential to cause cancer, however, and for this reason it is not generally recommended or accepted as a keloid treatment. Moreover, roughly 20 percent of keloids treated by radiation therapy alone recur within one year.
Surgical procedures, including excision, cryosurgery and laser therapy, can effectively remove keloid tissue, and currently are the treatment of choice for hypertrophic scars. However, these techniques often cause tissue trauma that results in further hypertrophic or keloid scars. Indeed, keloids recur in well more than half of patients treated by surgical excision, cryosurgery, and laser therapy. Additionally, these procedures cause pain and present a risk of infection. Cryosurgery also causes skin depigmentation in some patients.
One proposed therapy for excessive scars entails the administration of selective estrogen receptor modulators, such as tamoxifen and its derivatives. In vitro, tamoxifen inhibits keloid fibroblast proliferation and decreases collagen production. Apparently, tamoxifen effects this inhibition by downregulating TGF-β1 expression, which promotes collagen formation. In a related vein, U.S. patent publication No. 2005/0032910 describes treating excessive scarring with 4-hydroxy tamoxifen formulated in a hydroalcoholic gel. Such treatments, however, have not been widely embraced.
Thus, despite the broad array of treatments available, there is no widely accepted and predictably effective means for preventing or treating excessive scars. Accordingly, an effective approach to reducing keloid and hypertrophic scars would offer significant benefit.
Described herein are compositions and methods for treating excessive scars, such as keloid scars and hypertrophic scars. The compositions comprise a hydration agent and an anesthetic, and do not comprise a selective estrogen receptor modulator. In some embodiments, the compositions do not comprise any active ingredients other than one or more hydration agents and one or more anesthetics.
In some embodiments, the hydration agent comprises an emollient, such as isopropyl myristate; a gelling agent, such as hydroxypropyl cellulose; and/or a humectant.
In some embodiments, the anesthetic comprises an anesthetic selected from the group consisting of alcohols, benzocaine, menthol, butamben, dibucaine, lidocaine, pramoxine, and tetracaine, such as ethanol and/or isopropanol.
In some embodiments, the composition is a hydroalcoholic gel, such as a composition comprising an alcohol, isopropyl myristate, and hydroxypropyl cellulose.
In specific embodiments, the composition comprises (a) about 0.5% to 2% by weight of isopropyl myristate; (b) about 60% to 75% by weight of absolute alcohol; (c) about 25% to 40% by weight of aqueous vehicle, and (d) about 0.5% to 5% by weight of gelling agent, wherein the percentage of components are weight to weight of said composition. In some embodiments, the composition further comprises a neutralizing agent.
In the methods described herein, the compositions are applied to an excessive scar, such as by topical application or injection.
The present inventors have discovered that, by administering a pharmaceutical composition comprising a hydration agent and an anesthetic, one can treat excessive scars with few if any side effects. The pharmaceutical compositions do not contain a SERM, hormone or corticosteroid active ingredient. Indeed, in certain embodiments, the only active ingredients in the pharmaceutical compositions are a hydration agent and an anesthetic. Accordingly, the approach of the invention provides a superior safety profile and easier patient compliance compared to other treatment methods.
Thus, described herein are methods for treating excessive scarring, illustrated by keloid scars and hypertrophic scars. The methods comprise administering an effective amount of a pharmaceutical composition that comprises a hydration agent and an anesthetic for a period of time sufficient to minimize the scar or symptoms of the scar. Also described are pharmaceutical compositions for treating excessive scarring. Such a pharmaceutical composition does not contain a selective estrogen receptor modulator (SERM), hormone or corticosteroid active ingredient. In certain embodiments, the active ingredients consist solely of a hydration agent and an anesthetic. The treatment approach described herein offers several advantages over other treatments for scars, including (1) few systemic side effects, (2) a better safety profile, and (3) easy patient compliance.
In performing the methods described herein, compositions may be administered by any means that delivers the active ingredients to scar tissue in vivo. In some embodiments, the administration is performed locally, such as by topical administration at the site of a scar or by direct injection into a scar. The described methodology may be performed as the sole form of therapy or may be combined with other forms of therapy.
A broad range of topical formulations are described. In specific embodiments, the hydration agent may be an emollient, a gelling agent, a humectant, or a combination thereof. The anesthetic may be any topical anesthetic, such as an alcohol. In some embodiments, the topical formulation is a hydroalcoholic gel. In a specific example, such gels comprise:
a) about 0.5% to 2.0% by weight of isopropyl myristate,
b) about 60% to 75% by weight of absolute alcohol,
c) about 25% to 40% by weight of aqueous vehicle,
d) about 0.5% to 5.0% by weight of gelling agent,
wherein the percentage of components are weight to weight of the composition.
As used herein, the phrases “excessive scar” and “excessive scarring” connote overgrowth of dense fibrous tissue, resulting from abnormal wound healing. Excessive scars have grown larger than necessary for normal wound healing, and are characterized by overproduction of cells, collagen and/or proteoglycan.
“Keloid scars” are excessive scars in which the dense fibrous tissue extends beyond the borders of the original wound or incision, and does not usually regress spontaneously. Determining whether a scar is a keloid can be a challenge, because keloids often superficially resemble other hypertrophic scars. Still, keloids have distinguishing histological features. One such feature is the collagen nodule, which contains a high density of fibroblasts and unidirectional collagen fibrils in a highly organized and distinct orientation. Additionally, keloids have a rich vasculature, a high mesenchymal cell density, and a thickened epidermal cell layer.
Skin color and genetics, which correlate with keloid formation, also can aid a determination of whether a scar is a keloid. As many as 16% of black Africans have keloids, while Polynesians, Chinese, Indians and Malaysians have fewer. Whites and albinos have the fewest. Patients with keloid scars tend to have an associated strong family history; both autosomal dominant and autosomal recessive modes of transmission have been reported.
“Hypertrophic scars” are excessive scars in which the dense fibrous tissue does not extend beyond the borders of the original wound or incision. They tend to be wider than necessary for normal wound healing to occur. Histologically, hypertrophic scars have more organized collagen fibers than keloids, and scant mucoid matrix. Hypertrophic lesions are characterized by randomly distributed tissue bundles consisting of uniaxially oriented extracellular matrix and cells.
As used herein, “treatment” of an excessive scar refers to a reduction in the defining characteristics or symptoms of the scar. Treatment may be a reduction in the size of a scar, as measured by the length, width, or thickness of the scar. Treatment also may be a reduction in pain associated with the scar or a reduction in itching associated with the scar. Treatment also may be a normalization of pigmentation in the scar, an increase of pliability in the scar or a decrease in vascularity within the scar (which may be evidenced by a color change from purple to red to pink to white within the scar). Improvement in any one of these factors is considered successful treatment.
“Hydration agents” are substances that preserve or increase the moisture content of skin. Studies have shown that water evaporates from excessive scars (e.g., hypertrophic and keloid scars) roughly four times more rapidly than from normal scars and skin. The present inventors have found that stemming that loss of water contributes to treating excessive scars and symptoms of excessive scarring. Useful hydration agents include emollients, gelling agents and humectants. A combination of hydration agents may be used.
“Emollients” are substances that soften the skin. Due to their occlusive properties, many emollients improve moisturization of the skin. Emollients are well known in the art, and include mineral oil, petrolatum, polydecene, isohexadecane, fatty acids and alcohols having from 10 to 30 carbon atoms; pelargonic, lauric, myristic, palmitic, stearic, isostearic, hydroxystearic, oleic, linoleic, ricinoleic, arachidic, behenic, and euricic acids and alcohols; triglyceride esters, castor oil, cocoa butter, safflower oil, sunflower oil, jojoba oil, cottonseed oil, corn oil, olive oil, cod liver oil, almond oil, avocado oil, palm oil, sesame oil, squalene, Kikui oil, soybean oil, acetoglyceride esters, ethoxylated glycerides, ethoxylated glyceryl monostearate, alkyl esters of fatty acids having 10 to 20 carbon atoms, hexyl laurate, isohexyl laurate, isohexyl palmitate, isopropyl palmitate, decyl oleate, isodecyl oleate, hexadecyl stearate, decyl stearate, diisopropyl adipate, diisohexyl adipate, diisopropyl sebacate, lauryl lactate, myristyl lactate, acetyl lactate; alkenyl esters of fatty acids having 10 to 20 carbon atoms, oleyl myristate, oleyl stearate, oleyl oleate, fatty acid esters of ethoxylated fatty alcohols, polyhydric alcohol esters, ethylene glycol mono and di-fatty acid esters, diethylene glycol mono- and di-fatty acid esters, polyethylene glycol, wax esters, beeswax, spermaceti, myristyl myristate, stearyl stearate, silicone oils, dimethicones, cyclomethicone. In some embodiments, emollients are selected that are liquid at room temperature. In some embodiments, the emollient is isopropyl myristate.
“Gelling agents” are substances that increase the viscosity of a liquid formulation. Gelling agents also are well known in the art. Exemplary gelling agents include polyacrylic acid polymers, carbomers, cellulose derivatives, poloxamers and poloxamines. More particularly, exemplary gelling agents include chitosans, dextrans, pectins, natural gums and cellulose derivatives such as ethyl cellulose, hydroxypropyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose (HPMC), carboxymethyl cellulose (CMC), and the like. In some embodiments, the gelling agent is hydroxypropyl cellulose. A combination of gelling agents also can be used.
“Humectants” are hygroscopic substances that absorb water from the air. Exemplary humectants include glycerine, propylene glycol, glyceryl triacetate, polyols, sorbitol, maltitol, polymeric polyols, polydextrose, quillaia, lactic acid, urea. Lactic acid and urea are natural components that moisturize, soften and condition the skin. A combination of humectants also can be used.
“Anesthetics” are substances that reversibly depress neuronal function to produce a loss in the ability to perceive pain and/or other sensations. Local anesthetics have this effect in specific areas of the body or along specific neuronal pathways. Topical anesthetics can be used. These numb the surface of a body part. Exemplary topical anesthetics are alcohols, benzocaine, benzyl alcohol, menthol, butamben, dibucaine, lidocaine, pramoxine, and tetracaine. Alcohols are suitable, including lower hydrocarbon chain (C1-C7 or C1-C4) alcohols, such as ethanol and isopropanol. In addition to their anesthetic properties, alcohols provide a cooling effect that can reduce burning sensations cause by excessive scars.
For topical administration, the composition may be an ointment, cream, gel, emulsion (lotion), powder, oil or similar formulation. To this end, a formulation may comprise customary excipient additives.
In some embodiments, the compositions are hydroalcoholic gels. The alcohol component used in such gels may have a low boiling point, such as less than 100° C. at atmospheric pressure, to permit rapid evaporation upon contact with the scar. Exemplary alcoholic components are ethanol and isopropanol. The amount of absolute alcohol generally ranges between about 35% and about 99.9%, such as between about 50% and about 85%, including between about 60% and about 75% by weight, such as 35% to 99.9%, 50% to 85%, or 60% to 75% by weight. Thus, the amount of absolute alcohol in a gel formulation may be about 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74% or 75% by weight, based on the total weight of the composition.
The aqueous component used in such gels solubilizes any hydrophilic molecules in the formulation, and it also promotes moisturization of the skin. An aqueous component also can regulate pH, such as in the range of about 4 to about 12, in the range of about 6 to about 11, or in the range of about 8 to about 10, such as at about 9.
Aqueous components include alkalinizing and basic buffer solutions, including phosphate buffered solutions (e.g., dibasic or monobasic sodium phosphate), citrate buffered solutions (e.g., sodium citrate or potassium citrate) and simply purified water. In some embodiments, a phosphate buffer is used. The amount of an aqueous component may range between about 0.1% and about 65% by weight of the pharmaceutical composition, between about 15% and about 50%, or between about 25% and about 40%, such as 0.1%-65%, 15% to 50%, or 25% to 40%. Thus, the amount of an aqueous component may be about 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39% or 40% by weight, based on the total weight of the formulation. In formulations that contain an aqueous component, the amount of absolute alcoholic vehicle in a formulation may be from about 60% to about 75%.
The amount of a hydration agent and anesthetic in the hydroalcoholic gels described herein will vary, depending on the particular hydration agent and anesthetic. Determination of pharmaceutically effective amounts for these components is well within the ordinary level of skill. Nevertheless, when isopropyl myristate is used as a hydration agent, the amount in a hydroalcoholic gel typically may range from about 0.1 to about 5.0 grams per 100 grams of gel. In some embodiments, the amount of isopropyl myristate ranges from about 0.5 to about 2.0 grams per 100 grams of gel. In such embodiments, isopropyl myristate may constitute about 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2.0% by weight of the total composition.
Hydroalcoholic gels may comprise one or more gelling agents to increase the viscosity of a formulation and/or to function as a solubilizing agent. Depending on the gelling agent's nature, it may constitute between about 0.1% and about 20% by weight of a formulation, between about 0.5% and about 10%, including between about 0.5% and about 5%, such as 0.1% to 20%, 0.5% to 10%, or 0.5% to 5%. Thus, the amount of a gelling agent may be about 0.5%, 1.0%, 1.5%, 2.0%, 2.5%, 3.0%, 3.5%, 4.0%, 4.5% or 5.0% by weight, based on the total weight of the composition.
When a formulation comprises a gelling agent, in particular a non-preneutralized acrylic polymer, it may advantageously also comprise a neutralizing agent. The neutralizing agent/gelling agent ratio may be is between about 10:1 and about 0.1:1, including between about 7:1 and about 0.5:1, or between about 4:1 and about 1:1, such as between 10:1 and 0.1:1, between 7:1 and 0.5:1, or between 4:1 and 1:1. Thus, the neutralizing agent/gelling agent ratio may be about 7:1, 6:1, 5:1, 4:1, 3:1, 2:1, 1:1 or 0.5:1. A neutralizing agent may form, in the presence of the polymer, soluble salts. A neutralizing agent also may permit optimum swelling of polymer chains during neutralization of charges and formation of polymer salts. Useful neutralizing agents include sodium hydroxide, ammonium hydroxide, potassium hydroxide, arginine, aminomethylpropanol, prolamine and tromethamine. Those skilled in the art will select a neutralizing agent according to the type of gelling agent employed in a formulation. When cellulose derivatives are used as gelling agents, however, no neutralizing agents are required.
In certain embodiments, the hydroalcoholic gel comprises:
a) about 0.5% to 2% by weight of isopropyl myristate,
b) about 60% to 75% by weight of absolute alcohol,
c) about 25% to 40% by weight of aqueous component, and
d) about 0.5% to 5% by weight of gelling agent,
wherein the percentage of components are weight to weight of said composition. In some embodiments, the hydroalcoholic gel consists of these components. Thus, isopropyl myristate may constitute about 0.5%, 0.6%, 0.7%, 0.8%, 0.9%, 1.0%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9% or 2.0% by weight of the hydroalcoholic gel. In specific embodiments, ethyl alcohol or isopropanol is the alcoholic component; polyacrylic acid polymer, hydroxypropyl cellulose or another cellulose derivative is the gelling agent; and a phosphate buffered solution is the aqueous component.
As noted above, compositions described herein do not contain a SERM, hormone or corticosteroid active ingredient. SERMs constitute a class of compounds that act on estrogen receptors and exert various effects, depending on their metabolism and the tissue. That is, SERMs selectively inhibit or stimulate estrogen-like action in the tissues. Members of the SERM class include tamoxifen, 4-hydroxy tamoxifen, raloxifene, clomifene, toremifene, bazedoxifene, lasofoxifene, tibolone, droloxifene, idoxifene, ormeloxifene, arzoxifen, ospemifene, nafoxidene, trioxifene, pro-drugs thereof, and active metabolites thereof; and antibodies that bind to estrogen or estrogen receptors.
Hormones, as used herein, refer to steroid hormones. The steroid hormones are fat-soluble organic compounds based on a structure of 17 carbon atoms arranged in four rings. They can be grouped into five groups based on the receptors to which they bind: glucocorticoids, mineralocorticoids, androgens, estrogens and progestogens.
Glucocorticoids, or corticosteroids, bind with the cortisol receptor. Cortisol, also known as hydrocortisone, is the prototypical glucocorticoid. Other glucocorticoids are cortisone acetate, prednisone, prednisolone, methylprednisolone, dexamethasone, betamethasone, triamcinolone, beclomethasone, fludrocortisone acetate, deoxycorticosterone acetate (DOCA) and aldosterone.
Mineralocorticoids bind to the cytosolic mineralocorticoid receptor. Aldosterone is a primary example. An exemplary synthetic mineralocorticoid is fludrocortisone.
Androgens bind to androgen receptors. The primary androgen is testosterone. Others are dehydroepiandrosterone (DHEA), dehydropiandrosterone sulfate (DHEA-S), androstenedione, androstanediol, androsterone and dihydrotestosterone (DHT). A number of synthetic androgens exist, including oxandrolone and decadurabolin.
Estrogens bind to estrogen receptors. Primary examples include estradiol, estriol and estrone. Diethylstilbestrol is a synthetic example.
Progestagens bind to the progesterone receptor. Progesterone in the primary example. Others include cyproterone acetate, dydrogesterone, medroxyprogesterone acetate, chlormadinone acetate, megestrol, promegstone, norethisterone, norethindrone acetate, (levo)norgestrel, lynestrenol, desogestrel, drospirenone, ethynodiol diacetate, norelgestromin, norgestimate, gestodene and tibolone.
In some embodiments, the composition consists of one or more hydration agents, one or more anesthetics and, optionally, one or more neutralizing agents. In other embodiments, the composition consists essentially of one or more hydration agents, one or more anesthetics and, optionally, one or more neutralizing agents. As used herein, the phrase “consists essentially of” means that the composition does not include any additional components that would materially affect the basic and novel characteristics of the compositions,” such as a SERM, hormone or corticosteroid active ingredient. Compositions that consist essentially of one or more hydration agents, one or more anesthetics and, optionally, one or more neutralizing agents, may include inactive excipient additives that are customary in topical and/or injectable pharmaceutical preparations.
In certain embodiments, the composition consists of an aqueous vehicle and one or more hydration agents, one or more anesthetics, and, optionally, one or more neutralizing agents. In other embodiments, the composition consists essentially of an aqueous vehicle and one or more hydration agents, one or more anesthetics, and, optionally, one or more neutralizing agents. As used herein, the phrase” consists essentially of” means that the composition does not include any additional components that would materially affect the basic and novel characteristics of the compositions,” such as a SERM, hormone or corticosteroid active ingredient. Compositions that consist essentially of an aqueous vehicle and one or more hydration agents, one or more anesthetics, and, optionally, one or more neutralizing agents, may include inactive excipient additives that are customary in topical and/or injectable pharmaceutical preparations.
A pharmaceutical composition as described herein may be administered in any dosage form and via any system that delivers the active ingredients to a scar in vivo. In some embodiments, the composition is topically applied to the surface of a scar or is injected into scar. The optimal method of administration to treat scarring will depend upon the location of the scar and the extent of scarring.
Determination of a dosage and administration schedule are within the ordinary skill of the art. In general, appropriate dosages and administration schedules can be defined by routine testing in order to obtain optimal treatment of scars, while minimizing any potential side effects. Moreover, the dosage and administration schedules may be optimized using a pharmacokinetic/pharmacodynamic modeling system. For example, one or more dosage regimens may be chosen and a pharmacokinetic/pharmacodynamic model may be used to determine the pharmacokinetic/pharmacodynamic profile of one or more dosage regimens. Next, one of the dosage regimens for administration may be selected which achieves the desired pharmacokinetic/pharmacodynamic response based on the particular pharmacokinetic/pharmacodynamic profile.
Specifically, pharmaceutical compositions may be administered at least once a week, including at least once a day over the course of several weeks to several months. In one embodiment, the compositions are administered at least once a week or at least once a day over one to six months. Prolonged use of the compositions is possible due to the excellent safety profile.
More specifically, the pharmaceutical compositions may be administered at least once a day for about 2 weeks, at least once a day for about 3 weeks, at least once a day for about 4 weeks, at least once a day for about 5 weeks, at least once a day for about 6 weeks, at least once a day for about 7 weeks, at least once a day for about 2 months, at least once a day for about 3 months, at least once a day for about 4 months, at least once a day for about 5 months, at least once a day for about 6 months, at least once a day for about 7 months, at least once a day for about 8 months, at least once a day for about 9 months, at least once a day for about 10 months, at least once a day for about 11 months, or at least once a day for about a year or more.
Alternatively, the pharmaceutical compositions may be administered about once every day, about twice every day, about thrice every day, about once every 2 days, about once every 3 days, about once every 4 days, about once every 5 days, about once every 6 days or about once every 7 days for the periods set forth above.
It is contemplated that the methods and compositions described herein may be combined with other keloid therapies. Accordingly, the described method of treatment may be accompanied by the use of occlusive dressings, compression therapy, intralesional corticosteroid injections, radiation therapy, and surgery, including cryotherapy and laser therapy.
Reference to the following illustrative example will help to provide a more complete understanding of the compositions and methods described herein.
This example demonstrates that a hydroalcoholic gel containing a hydration agent and an anaesthetic, without 4-hydroxy tamoxifen or other active agent, reduces the symptoms of keloid scars.
A six-month study was performed on 62 women having keloid scars. Selection criteria for the study required participants to be over 18 years of age and to present with a symptomatic keloid scar as assessed by a minimum 40 mm level on the Visual Analog Scale for pain/discomfort and/or itching. None of the scars had been treated with any other agent, including steroids, external radiation or silicone sheeting within the previous three months. As noted earlier, keloid scars generally do not regress spontaneously.
The participants were randomized into two groups. In a first group, 32 women applied 0.5 ml of hydroalcoholic gel to their keloid scar twice daily for six months. The hydroalcoholic gel contained 1% isopropyl myristate, 1.5% hydroxypropyl cellulose, 70.9% ethanol (96% alcohol v/v), and 26.5% phosphate buffer solution. In the second group, 30 women applied 0.5 ml of a nearly identical hydroalcoholic gel, containing a selective estrogen receptor modulator (SERM), to their keloid scar twice daily for six months. The only difference between the two gel compositions was the presence or absence of 0.05% SERM. Both gels were transparent, odorless, and dried within two minutes of being spread on the scars. They were dispensed utilizing a canister with a metered airless pump.
The study was conducted at a specialized hospital site by dermatologists. Follow-up visits were conducted with the participants at months 1, 3 and 6. Compliance to gel application throughout the study was 98% for both groups.
Results of the study (both treatment groups) were as follows:
Efficacy data were generated for two analysis populations. The primary analysis population was an Intent-to-Treat (ITT) population, which included all subjects randomized to the two groups described above who had at least one treatment efficacy measurement. A secondary analysis population was a Per-Protocol population, which included all subjects who adhered to the protocol by (a) participating in the study through at least Month 4, (b) having at least one valid efficacy assessment after Month 4, (c) having no serious violation of protocol requirements, and (d) complying with application of the hydroalcoholic gel. Analysis of the data showed the following results:
The following tables provide details of the statistical analyses for the hydroalcoholic gel (non-SERM) treatment group.
Table 1.1 shows that application of the hydroalcoholic gel effected a statistically significant improvement in pain/discomfort within the ITT population.
Table 1.2 shows that application of the hydroalcoholic gel effected a statistically significant improvement in pain/discomfort within the per protocol population.
Table 2.1 shows that application of the hydroalcoholic gel effected a statistically significant improvement in itching within the ITT population.
Table 2.2 shows that application of the hydroalcoholic gel effected a statistically significant improvement in itching within the per protocol population.
Table 3.1 shows that application of the hydroalcoholic gel effected statistically significant improvements in pigmentation, pliability, height, vascularity and total Vancouver Scar Scale Rating score within the ITT population.
The Vancouver Scar Scale Rating is a widely used tool to document change in scar appearance (Baryza M J, Baryza G A. (1995) The Vancouver Scar Scale: an administration tool and its interrater reliability. J Burn Care Rehabil. 16(5): 535-8).
Table 3.2 shows that application of the hydroalcoholic gel effected statistically significant improvements in pigmentation, pliability, height, vascularity and total Vancouver Scar Scale Rating score within the per protocol population.
Table 4.1 shows that application of the hydroalcoholic gel effected a statistically significant improvement in global impression of change in keloid scar severity within the ITT population.
Table 4.2 shows that application of the hydroalcoholic gel effected a statistically significant improvement in global impression of change in keloid scar severity within the per protocol population.
Table 5.1 shows that application of the hydroalcoholic gel effected a statistically significant improvement in descriptive statistics of change rated from photographs within the ITT population.
Table 5.2 shows that application of the hydroalcoholic gel effected a statistically significant improvement in descriptive statistics of change rated from photographs within the per protocol population.
The present application claims the benefit of U.S. Provisional Application No. 60/834,163 filed Jul. 31, 2006, the disclosure of which is hereby incorporated by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 60834163 | Jul 2006 | US |
