A 6-Week Study to Evaluate the Photoallergic Potential of Diacerein 1% Ointment in Healthy Volunteers

Study Overview
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Brief Summary
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A study in healthy male and female adult volunteers to determine the potential of diacerein 1% ointment to induce a photoallergic skin reaction using a controlled photopatch testing procedure.

Detailed Description
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This was a randomized, single center, vehicle controlled, within-subject comparison study of diacerein 1% ointment and vehicle ointment applied under fully occlusive patch conditions on the infrascapular region of each subject's back to induce a photoallergic skin reaction following Ultraviolet (UV) irradiation. This was repeated twice each week during the 3-week Induction Phase, once during rest week 4 as applicable and once at Challenge Phase.

Official Title
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A 6-Week, Randomized Study to Evaluate the Potential of CCP-020 (Diacerein 1%) Topical Ointment to Induce a Photoallergic Skin Reaction in Healthy Subjects, Using a Controlled Photopatch Test Design

Conditions
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Healthy

Intervention / Treatment
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* Drug: Diacerein 1% ointment


Participation Criteria
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Eligibility Criteria
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Key Inclusion Criteria: Is a healthy male or female (to be confirmed by medical history); Is 18 years of age or older; In the case of a female of childbearing potential, is using an acceptable form of birth control; In the case of a female of childbearing potential, has a negative urine pregnancy test (UPT) at Day 1 and are willing to submit to a UPT at the end of study (EOS); Is free of any systemic or dermatological disorder, which, in the opinion of the Investigator, will interfere with the study results or increase the risk of AEs; Is of any Fitzpatrick Skin Type or race, providing the skin pigmentation will allow discernment of erythema Key Exclusion Criteria: Has a history of photosensitivity or photoallergy; Is using systemic/topical corticosteroids within 3 weeks prior to and/or during the study, or systemic/topical antihistamines 72 hours prior to and during the study; Is not willing to refrain from using systemic/topical anti-inflammatory analgesics such as aspirin, (occasional use of acetaminophen will be permitted); Are taking medication known to cause phototoxic reactions (eg, tetracyclines, thiazides, nonsteroidal anti-inflammatory drugs [NSAIDS]); Is using medication which, in the opinion of the Investigator, will interfere with the study results; Is unwilling or unable to refrain from the use of sunscreens, cosmetics, creams, ointments, lotions or similar products on the back during the study; Has psoriasis and/or active atopic dermatitis/eczema; Had a known sensitivity or allergy to constituents of the materials being evaluated including diacerein, mineral oil, petrolatum, cetyl alcohol, D&C Yellow #10 and/or ethyl paraben; Has damaged skin in or around the test sites, including sunburn, excessively deep tans, uneven skin tones, tattoos, scars, excessive hair, numerous freckles, or other disfigurations of the test site; Has received treatment for any type of internal cancer within 5 years prior to study entry; Has any known sensitivity to adhesives; and/or Has received any investigational drugs(s) with 4 weeks prior to study entry

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Prevention
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Other: Single Cohort (Healthy Volunteers)<br>Diacerein 1% topical ointment Intra-subject photoallergy (photosensitization) test | Drug: Diacerein 1% ointment<br>* During the 3-week Induction Phase, diacerein 1% ointment and vehicle ointment were applied under fully occlusive patch conditions to two randomly assigned skin sites on the infrascapular region of the back twice each week for approximately 24 hours (±4 hours). After patch removal, one application site and an untreated control site was irradiated, and all sites were evaluated 24 hours, 48 hours, and 72 hours later. Following a rest period, during the Challenge Phase, the study products were applied to two naive sites once for approximately 24 hours (±4 hours). After patch removal, one application site and an untreated control site was irradiated, and all sites were evaluated 24 hours, 48 hours, and 72 hours later. A Re-Challenge was to be performed if a response observed during the Challenge Phase indicated photosensitization.<br>* Other names: CCP-020;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Observed Photoallergy (Photosensitization): Number of Skin Sites by Maximum Total Irritation Score | The determination of photosensitization reactions was summarized by frequency counts of the total dermal irritation score during the Challenge Phase. Total Irritation Score is a visual score summing the degree of erythema and edema. Minimum score=0, maximum score=5; higher score=worse outcome | Skin sites evaluated 24, 48, and 72 hours after patch removal and irradiation challenge |