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
Phase: PHASE1
Conditions: Healthy
Sponsor: Castle Creek Pharmaceuticals, LLC

6 Century Drive, 2nd Floor  
Parsippany, NJ 07054 
 
 
 
 
Clinical Study Protocol 
CCP-020 (Diacerein 1%) Topical Ointment 
Sponsor Protocol No. CCP-020-105 
TKL Study No. PB710217 
 
 
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 
 
 
Author: 
 
 
 
 
Document type: 
 
 
Clinical Study Protocol 
Development Phase:  
 
1 
Document Date: 
 
 
25-October-2017 
Document Status 
 
 
Final v1.0 
Number of Pages:  
 
 
43 
 
 
 
Property of Castle Creek Pharmaceuticals, LLC. 
Confidential 
May not be used, divulged, published, or otherwise disclosed  
without the consent of Castle Creek Pharmaceuticals, LLC. 
 
 

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Clinical Study Protocol 
Synopsis 
Study Title: 
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  
TKL Study Number: 
PB710217 
Sponsor Protocol Number: 
CCP-020-105 
Sponsor: 
Castle Creek Pharmaceuticals, LLC 
Development Phase: 
1 
Study Objectives: 
To determine the potential of CCP-020 (Diacerein 1%) Topical Ointment to induce a 
photoallergic skin reaction using a controlled photopatch testing procedure. 
Study Design: 
During the 3-week Induction Phase, CCP-020 (Diacerein 1%) Topical Ointment and 
vehicle ointment, will each be applied 2 times per week (Monday and Thursday) to 
2 sites on the infrascapular area of the back under fully occlusive patch conditions for 
approximately 24 hours (±4 hours). Minimal erythema dose (MED) irradiation will 
also be performed for each subject on Day 1.  After patch removal, all application 
sites will be evaluated and one application site of each study product will be irradiated 
with 2 times the subject’s MED using the full Xenon lamp spectrum.  All sites will be 
evaluated at approximately 48 hours later when irradiated on Tuesdays and 72 hours 
later when irradiated on Fridays.  An additional application of study product may be 
applied on the Monday of rest week 4 if the subject misses an irradiation session 
during the induction phase of the study.  At Challenge, CCP-020 (Diacerein 1%) 
Topical Ointment and vehicle ointment will each be applied once to 2 naive sites on 
the infrascapular area of the back under fully occlusive patch conditions for 
approximately 24 hours (±4 hours).  After patch removal, all application sites will be 
evaluated and one site of each test product will be irradiated with 6 J/cm2 of 
Ultraviolet A (UVA) followed by 0.5 times the subject’s MED of UVA/Ultraviolet B 
(UVB).  An additional untreated site will also be irradiated at Challenge and will 
serve as an untreated control.  Each site, including the untreated control site, will be 
evaluated again at approximately 24 hours (±4 hours), 48 hours (±4 hours), and 72 
hours (±4 hours) following irradiation. A Rechallenge will be performed if a 
cutaneous response observed during the Challenge Phase indicates possible 
photosensitization or at the discretion of the Investigator.   
Planned Sample Size: 
50 evaluable subjects 
Study Population: 
Healthy adult male and female volunteer subjects 
Investigational Products: 
CCP-020 (Diacerein 1%) Topical Ointment 
Vehicle Ointment 
Control: 
An untreated irradiated non-occlusive (open) control site. 
Efficacy Evaluation 
Criteria: 
Not applicable 

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Safety Evaluation 
Criteria: 
The safety endpoints for this study are irritation responses during the Induction 
Phase, positive responses at Challenge (i.e., reactions indicative of a sensitization 
response) and adverse events.  All local and systemic adverse events (AEs) observed 
by or reported to the Investigator will be evaluated.  The intensity, duration, and 
causal relationship to the study products are to be rated for all AEs. 
Statistical Methods: 
The focus of the statistical analysis will be the comparison with controls of the 
photoallergic response to the study products. The diagnosis of photosensitization 
response will be made by the Investigator based on review of the observed skin 
responses after Challenge. 
Mean numerical equivalent scores, including all scores assigned during Induction, will 
be analyzed with analysis of variance (ANOVA) with factors subject and treatment. 
All pairwise treatment comparisons will be performed. Pairs to be compared are: each 
test sample irradiated versus non-irradiated and all pairwise comparisons on each side.  
Number of Study 
Centers: 
Single Center 
Planned Date of Study 
December 2017 – February 2018 

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Investigators and study administrative structure  
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
 
 
  
                                       
 
 
 
 
 
 
 
 
   
  
                                       
 
 
 
 
 
 
 
 
  
 
 
 
                           
 
  
 
 
 
 
 
 
  
                                       
 
 
 
 

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Clinical Study Protocol 
 
 
 
  
                                       
 
 
  

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Clinical Study Protocol 
Table of Contents 
Synopsis 
 ......................................................................................................................................2 
Signature page ..................................................................................................................................4 
Signature page for the Principal Investigator...................................................................................5 
Investigators and study administrative structure..............................................................................6 
Table of Contents .............................................................................................................................8 
List of Tables .................................................................................................................................11 
List of Abbreviations .....................................................................................................................12 
1. 
INTRODUCTION ......................................................................................................13 
1.1. 
Background Information .............................................................................................13 
2. 
STUDY OBJECTIVES ..............................................................................................14 
3. 
INVESTIGATIONAL PLAN .....................................................................................15 
3.1. 
Study Design ...............................................................................................................15 
3.2. 
Discussion of Design ..................................................................................................16 
3.3. 
Study Population .........................................................................................................16 
3.3.1. 
Subject Population ......................................................................................................16 
3.3.2. 
Inclusion and Exclusion Criteria ................................................................................16 
3.3.3. 
Interruption or Discontinuation of Treatment .............................................................18 
3.3.4. 
Withdrawals ................................................................................................................19 
3.4. 
Treatments ..................................................................................................................19 
3.4.1. 
Investigational Products and Control ..........................................................................19 
3.4.2. 
Description of Investigational Products ......................................................................21 
3.4.3. 
Description of Patch Conditions .................................................................................21 
3.4.4. 
Packaging/Labeling ....................................................................................................21 
3.4.5. 
Assignment to Treatment ............................................................................................21 
3.4.5.1. 
Randomization ............................................................................................................21 
3.4.5.2. 
Blinding ......................................................................................................................22 
3.4.6. 
Prior and Concomitant Therapy ..................................................................................22 
3.4.7. 
Treatment Compliance ................................................................................................23 
3.5. 
Visit Schedule and Assessments .................................................................................23 
3.5.1. 
Study Procedures and Visit Schedule .........................................................................23 

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3.5.2. 
Visit Schedule .............................................................................................................26 
3.5.3. 
Definition of Minimal Erythemal Dose ......................................................................28 
3.5.4. 
Light source ................................................................................................................28 
3.5.5. 
Background information .............................................................................................28 
3.5.6. 
Efficacy Assessments .................................................................................................28 
3.5.7. 
Safety Assessments .....................................................................................................28 
3.5.7.1. 
Patch Test Site Evaluations ........................................................................................28 
3.6. 
Adverse Events ...........................................................................................................30 
3.6.1. 
Method of Determining Adverse Events ....................................................................30 
3.6.2. 
Adverse Event Definitions ..........................................................................................30 
3.6.2.1. 
Adverse Events ...........................................................................................................30 
3.6.2.2. 
Serious Adverse Events ..............................................................................................31 
3.6.2.3. 
Severity of Adverse Events ........................................................................................32 
3.6.2.4. 
Relationship of Adverse Events to Study Treatments ................................................32 
3.6.3. 
Reporting Adverse Events ..........................................................................................32 
3.6.4. 
Adverse Event Follow-up ...........................................................................................33 
3.6.5. 
Pregnancy reporting ....................................................................................................33 
3.6.6. 
Expected Adverse Events ...........................................................................................33 
3.7. 
Instructions for Rapid Notification of Serious Adverse Events .................................33 
3.7.1. 
Contact person and number ........................................................................................33 
3.7.2. 
Reporting Responsibility ............................................................................................34 
3.7.3. 
Reporting procedures ..................................................................................................34 
3.8. 
Appropriateness of Safety Measurements ..................................................................34 
4. 
STATISTICAL METHODS .......................................................................................35 
4.1. 
General Considerations for Data Analysis .................................................................35 
4.2. 
Sample Size and Power Considerations .....................................................................35 
4.3. 
Subject Populations for Analysis ................................................................................35 
4.3.1. 
Background and Demographic Characteristics ..........................................................35 
4.3.2. 
Study Product/Visit Compliance ................................................................................35 
4.4. 
Prior and Concomitant Medications ...........................................................................36 
4.5. 
Efficacy Evaluation ....................................................................................................36 
4.6. 
Safety Evaluation ........................................................................................................36 

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4.6.1. 
Assessment of Responses ...........................................................................................36 
4.6.2. 
Photosensitivity...........................................................................................................36 
4.6.3. 
Adverse Events ...........................................................................................................36 
4.7. 
Other topics .................................................................................................................36 
4.8. 
Interim analyses ..........................................................................................................37 
4.9. 
Special Methods ..........................................................................................................37 
5. 
ADMINISTRATIVE PROCEDURES .......................................................................38 
5.1. 
Ethics and Good Clinical Practice ..............................................................................38 
5.2. 
Institutional Review Board .........................................................................................38 
5.3. 
Informed consent ........................................................................................................38 
5.4. 
Declaration of Helsinki ...............................................................................................39 
5.5. 
Changes in Planned Study Conduct ............................................................................39 
5.5.1. 
Protocol amendments ..................................................................................................39 
5.5.2. 
Other changes in study conduct ..................................................................................39 
5.5.3. 
Termination or suspension of study ............................................................................39 
5.6. 
Data handling and record keeping ..............................................................................40 
5.6.1. 
Recording of data ........................................................................................................40 
5.6.2. 
Retention of documents ..............................................................................................40 
5.7. 
Product handling and accountability ..........................................................................40 
5.8. 
Quality control and quality assurance .........................................................................41 
5.8.1. 
Monitoring procedures ................................................................................................41 
5.8.2. 
Auditing procedures ....................................................................................................41 
5.9. 
Confidentiality and publication policies .....................................................................41 
5.9.1. 
Disclosure and confidentiality ....................................................................................41 
5.9.2. 
Communication and publication of results .................................................................42 
6. 
REFERENCES ...........................................................................................................43 
 

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List of Tables 
Table 1: 
Fitzpatrick Skin Types ................................................................................................24 
Table 2: 
Visit Schedule and Assessments .................................................................................27 
Table 3: 
Response Scores .........................................................................................................29 
Table 4: 
Notations .....................................................................................................................29 
Table 5: 
Relationship of AE to Study Drug ..............................................................................32 
 

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List of Abbreviations  
 
AE 
Adverse Event 
ANOVA 
Analysis of Variance 
CFR 
Code of Federal Regulations 
CRF 
Case Report Form 
DMP 
Data Management Plan 
EBS 
Epidermolysis bullosa simplex 
EOS 
End of Study 
FDA 
Food and Drug Administration 
GCP 
Good Clinical Practice 
GMP 
Good Manufacturing Practice 
IB 
Investigational Brochure 
ICH 
International Conference on Harmonisation 
ICF 
Informed Consent Form 
IP 
Investigational Product 
IRB 
Institutional Review Board  
MED 
Minimal Erythemal Dose 
MedDRA 
Medical Dictionary for Regulatory Activities 
NF 
National Formulary 
NSAIDs 
Non-Steroidal Anti-Inflammatory Drugs 
OA 
Osteoarthritis 
OTC 
Over-the-counter 
PI 
Principal Investigator 
PMD 
Primary Medical Doctor 
SAE 
Serious adverse event 
SAP 
Statistical Analysis Plan 
SOPs 
Standard Operating Procedures 
TKL 
TKL Research, Inc. 
UPT 
Urine pregnancy test 
USP 
United States Pharmacopeia 
UV 
UVA 
UVB 
Ultraviolet 
Ultraviolet A 
Ultraviolet B 
 

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1. 
INTRODUCTION 
This study evaluates the potential of CCP-020 (Diacerein 1%) Topical Ointment to induce a 
photoallergic skin reaction using a controlled photopatch test design.  Because CCP-020 
(Diacerein 1%) Topical Ointment is formulated for topical use, it is necessary to determine the 
potential of this product to cause a photoallergic reaction after application to the skin.   
The study will be conducted in compliance with Food and Drug Administration (FDA) 
regulations, the ethical principles of the Declaration of Helsinki concerning medical research in 
humans (Recommendations Guiding Physicians in Biomedical Research Involving Human 
Subjects, Helsinki 1964 and amendments 2013), the International Conference on Harmonization 
(ICH) – Good Clinical Practice (GCP) Guidelines as currently amended, and all applicable 
standard operating procedures (SOPs) of TKL Research, Inc. (TKL). 
1.1. 
Background Information 
CCP-020 (previously developed as AC-203) is a topical ointment containing diacerein (4,5-
bis[acetyloxy]-9,10-dihydro-9,10-dioxo-2-anthracene carboxylic acid; also known as diacetyl-
rhein), a highly purified anthraquinone derivative, and is being developed by Castle Creek 
Pharmaceuticals for the treatment of epidermolysis bullosa simplex (EBS).  The capsule 
formulation of diacerein, intended for oral use and systemic absorption, was initially approved 
for use in osteoarthritis (OA) in France in 1992 (as Artodar®, ART50®, or Zondar®).  Since then, 
it has received marketing authorization in over 30 countries in Europe, South America, and Asia.  
It is classified as a Symptomatic Slow-Acting Drug in OA.  Following oral administration of the 
capsule formulation, diacerein is rapidly metabolized to the deacetylated active metabolite, rhein.  
Similarly, diacerein in the topical formulation is hydrolyzed to rhein in the epidermis and the 
dermis following administration.  Diacerein and rhein have been shown to inhibit the in vitro and 
in vivo production and activity of interleukin (IL)-1β and other proinflammatory cytokines.  It 
has a novel mode of action that differentiates it from non-steroidal anti-inflammatory drugs 
(NSAIDs) and other conventional forms of drug therapy.   
For the development of CCP-020, a total of 10 animal studies have been conducted with CCP-
020 ointment 1%, including one skin penetration study, three acute dermal toxicity studies, one 
phototoxicity study, three pharmacokinetic studies, and two sub-chronic juvenile toxicity studies.  
CCP-020 was well-tolerated in these studies and no untoward adverse effects (AEs) were noted.  
To date, two clinical studies of CCP-020 have been completed in patients with epidermolysis 
bullosa simplex (EBS).  These include a Phase one pilot study in five patients and a Phase 2, 
multiple-site study in 17 patients in Europe.  The Phase 2 study demonstrated CCP-020 was 
well-tolerated and no treatment-related AEs were reported.  The Investigator’s Brochure should 
be consulted for summaries of the results of these studies.1 
This Phase 1 study will assess the photoallergic potential of CCP-020 (Diacerein 1%) topical 
ointment. 

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2. 
STUDY OBJECTIVES  
The objective of this study is to determine the photoallergic potential of CCP-020 (Diacerein 
1%) topical ointment when topical application to skin is followed by light exposure.   
In addition, safety will be assessed by evaluation of any adverse events (AEs) reported during the 
study. 

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3. 
INVESTIGATIONAL PLAN  
3.1. 
Study Design  
This will be a randomized, double-blind, single-center, vehicle-controlled, within-subject 
comparison study of the study products, CCP-020 (Diacerein 1%) topical ointment, vehicle 
ointment, and an untreated irradiated non-occluded (open) control site.  A total of 4 application 
sites (2 cm x 2 cm each) will be marked on the subject’s back and distributed so that 2 sites are 
on each side of the back.  One side of the back will be designated for irradiation after 
approximately 24 hours (±4 hours) of study product application and the other side will remain 
non-irradiated.  An additional site will be marked on the “irradiated side” of the back.  The site 
will receive no study product, but will be irradiated at Challenge to serve as an untreated 
irradiated non-occluded control.   
A defined area (approximately 50 cm2) on the infrascapular region of each subject’s back will be 
irradiated to determine the minimal erythemal dose (MED) of ultraviolet (UV) light. 
During the 3-week Induction Phase, 0.2 mL of each study product will be applied to 2 sites twice 
each week (Monday and Thursday) for approximately 24 hours (±4 hours) under occlusive patch 
conditions (6 applications).  After patch removal, all application sites will be evaluated and one 
application site of each study product will be irradiated with 2 times the subject’s MED using the 
full Xenon lamp spectrum.  The sites will be evaluated by a trained evaluator.  All sites will be 
reevaluated post irradiation, at approximately 48 hours later when irradiated on Tuesdays and at 
approximately 72 hours later when irradiated on Fridays except when irradiated on the last 
Friday of the Induction Phase or if a subject is taking a missed visit during induction, the sites 
will not be evaluated.  These procedures will be performed each week for 3 weeks of the 
Induction Phase.  Dermal reactions at the application sites will be evaluated using a visual scale 
that rates the degree of erythema, edema, and other signs of cutaneous irritation (see Table 3 and 
Table 4). 
 
At the end of the Induction Phase, the subjects will enter a Rest Period of 10-17 days and then a 
Challenge Phase.  One application/irradiation session may be missed during the Induction Phase.  
It must be made-up during Week 4.  An additional application of study product may be applied 
on the Monday of rest week 4 if the subject had missed an irradiation session during the 
induction phase of the study.  In either case, no evaluation will be required following irradiation. 
 
At Challenge, each study product will be applied in an amount of 0.2 mL to 2 naive sites once 
for approximately 24 hours (±4 hours) under occlusive patches.  After 24 hours (±4 hour) of 
product application, all sites will be evaluated and one application site of each product and the 
additional untreated control site will be irradiated.  The sites will be examined for dermal 
reactions at approximately 24 hours (±4 hours), 48 hours (±4 hours), and 72 hours (±4 hours) 
post-irradiation.  A Rechallenge will be performed if a cutaneous response observed during the 
Challenge Phase indicates possible photosensitization or at the discretion of the Investigator.   
 

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The safety endpoints for this study are irritation responses during the Induction Phase, positive 
responses at Challenge (i.e., reactions indicative of a sensitization response) and adverse 
events.   
3.2. 
Discussion of Design 
Results are interpreted according to working criteria which are based upon published works, as 
well as the clinical experience of TKL Research, Inc.  These working criteria are periodically 
reviewed and amended subject to new information that becomes available. 
This photoallergy study is designed to detect the ability of the CCP-020 (Diacerein 1%) topical 
ointment and vehicle ointment to cause photoallergic skin reactions when exposed to sunlight.  
Each subject is to receive applications of the CCP-020 (Diacerein 1%) topical ointment and the 
vehicle ointment product to 2 separate sites.  One will be irradiated and one will remain 
non-irradiated. An untreated non-occluded control site will also be irradiated at Challenge.  This 
design provides built-in controls for the test product CCP-020 (Diacerein 1%) topical ointment 
under both irradiated and non-irradiated conditions. 
3.3. 
Study Population 
3.3.1. 
Subject Population 
A sufficient number of subjects will be enrolled in order to provide 50 completed subjects 
evaluable for analysis; an individual subject will be allowed to participate in the study one time 
only.   
A rationale for the choice of sample size is provided in Section 4.2 of this protocol. 
3.3.2. 
Inclusion and Exclusion Criteria  
Inclusion Criteria  
A subject will be considered eligible for participation in the study if all of the following inclusion 
criteria are satisfied prior to randomization: 
1. Is a healthy male or female (to be confirmed by medical history);  
2. Is 18 years of age or older;  
3. In the case of a female of childbearing potential, is using an acceptable form of birth 
control (oral/implant/injectable/transdermal contraceptives, intrauterine device, condom 
with spermicide, diaphragm with spermicide, abstinence, partner’s vasectomy, tubal 
ligation). Abstinence or vasectomies are acceptable if the female subject agrees to 
implement one of the other acceptable methods of birth control if her lifestyle/partner 
changes;  
4. 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); 
5. 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; 

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6. Has uniformly-colored skin on the lower thoracic area of the back which will allow 
discernment of erythema, and has Fitzpatrick Skin Types I, II, or III (see Table 1); 
7. Complete a medical screening procedure; and 
8. Read, understand, and sign an informed consent. 
Exclusion criteria 
A subject who has any of the following will be excluded from the study: 
1. Has a history of photosensitivity or photoallergy; 
2. Has any visible skin disease at the application site which, in the opinion of the 
Investigator, will interfere with the evaluation of the test site reaction; 
3. 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; 
4. Is not willing to refrain from using systemic/topical anti-inflammatory analgesics such as 
aspirin (81 mg daily aspirin will be allowed), Aleve, Motrin, Advil, or Nuprin for 72 
hours prior to and during the study (occasional use of acetaminophen will be permitted); 
5. Are taking medication known to cause phototoxic reactions (eg, tetracyclines, thiazides, 
nonsteroidal anti-inflammatory drugs [NSAIDS]); 
6. Is using medication which, in the opinion of the Investigator, will interfere with the study 
results (e.g. anti-inflammatory medications, antipsychotics, anticonvulsants with potential 
pain relief effects, immunomodulatory medications, and others); 
7. Is unwilling or unable to refrain from the use of sunscreens, cosmetics, creams, 
ointments, lotions or similar products on the back during the study; 
8. Has psoriasis and/or active atopic dermatitis/eczema; 
9. Has 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; 
10. Is a female who is pregnant, plans to become pregnant during the study, or is breast 
feeding a child; 
11. 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; 
12. Has received treatment for any type of internal cancer within 5 years prior to study entry; 
13. Has a history of, or are currently being treated for skin cancer and/or hepatitis; 
14. Has a history of, or is currently being treated for diabetes; 
15. Has any condition that might compromise study results; 
16. Currently or expect to sunbathe or use tanning salons during the study; 

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17. Has a history of adverse response (eg, blistering, sun poisoning) to ultraviolet (UV) sun 
lamps/sunlight exposure; 
18. Is currently participating in any clinical testing; 
19. Has any known sensitivity to adhesives; and/or 
20. Has received any investigational drug(s) within 4 weeks prior to study entry. 
3.3.3. 
Interruption or Discontinuation of Treatment  
A reaction of at least moderate erythema (2) accompanied with mild, but definite edema (1) to a 
study product observed after the first patch application/irradiation sequences of the Induction 
Phase may indicate the subject to be pre-sensitized, and may cause the discontinuation of the 
subject from the study. 
After the second reading of the Induction Phase, either of the following conditions will require 
the study product be applied to a naive patch site under semi-occlusive patch conditions: 
 Reaction of >50% “p” or “p” with no erythema, minimal/doubtful erythema, or definite 
erythema; or “D” (see Tables 3 and 4); 
 Any reaction of definite erythema with definite edema. 
Study product may not be relocated more than twice.   
The 3 weeks of continuous patch contact during the Induction Phase frequently results in 
tape-related irritation that is exacerbated by warm weather, but which occurs among some 
individuals irrespective of the season.  Tape-related irritation will not be graded as a 
photosensitivity response at the patch site, but will be noted separately on the CRF.  Severe 
tape-related irritation will necessitate a change in the application site.  As above, the application 
site will only be changed twice and then the subject must be discontinued. 
One application/irradiation session may be missed during the Induction Phase.  It must be 
made-up during Week 4.  In this case, no evaluation will be required following irradiation.  Only 
one missed patch application for study product is allowed.  A subject must be discontinued and 
considered not complete if more than one application is missed. 
In accordance with legal requirements and ICH-GCP guidelines, every subject or his/her legal 
representative has the right to refuse further participation in the study at any time and without 
providing reasons (see also Section 5.3).  A subject's participation is to be terminated 
immediately upon his/her request.  The Investigator should seek to obtain the reason and record 
this on the case report form (CRF).  
If at the time of refusal a study product has already been administered, the subject should be 
advised on follow-up safety investigations. If a subject withdraws from the study, all efforts will 
be made to complete a final evaluation if possible. Subjects discontinued for having experienced 
an AE will be followed until the AE is resolved, a reasonable explanation is provided for the 
event, or the subject is referred to his/her own primary medical doctor (PMD). The specific AE 
in question will be recorded on the appropriate CRF. 
If a subject develops a serious adverse event (SAE), his/her termination from the study will be 
considered by the Investigator.  Similarly, if the subject develops conditions over the course of 

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the study which would have excluded his/her entry in the study according to the safety-related 
medical exclusion criteria, he/she must be withdrawn immediately.    
The subject may be withdrawn from the study at any time at the discretion of the Investigator for 
medical reasons and/or due to non-adherence to the treatment scheme and other duties stipulated 
in the study protocol.  The reasons are to be documented on the CRF. 
In addition, the Sponsor retains the right to end the study at any time if the study cannot be 
carried out as agreed upon in the protocol.  In case of premature termination or suspension of the 
study, the Sponsor’s study manager will promptly inform the Investigator/institutions and 
regulatory authorities of the termination or suspension and the reason for that.  It is the 
responsibility of the Principal Investigator (PI) to notify the Institutional Review Board (IRB) in 
the case of premature termination/suspension. 
3.3.4. 
Withdrawals  
The following medical and other reasons justify a premature termination (by subject or 
Investigator) of any of the study IPs.  
• Adverse Event/Serious Adverse Event 
• Death  
• Protocol Violation (e.g. non-compliance) 
• Investigator Judgment  
• Pregnancy  
• Lost to Follow-up  
• Withdrawal by Subject   
• Study Terminated by Sponsor  
• Other  
If a subject withdraws from the study, all efforts will be made to complete a final evaluation, if 
possible.  Subjects discontinued for having experienced an AE will be followed until the AE is 
resolved, a reasonable explanation is provided for the event, or the subject is referred to his/her 
own primary medical doctor (PMD).  The specific AE in question will be recorded on the 
appropriate CRF. 
3.4. 
Treatments  
3.4.1. 
Investigational Products and Control  
Investigational Product(s): 
CCP-020 (Diacerein 1%) Topical Ointment 
CCP-020 is a topical ointment, 1% (w/w).  All excipients used in the topical formulation meet 
United States Pharmacopeia (USP)/ National Formulary (NF) criteria and are commonly used in 

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ointment formulations.  CCP-020 (Diacerein 1%) topical ointment is packaged in aluminum 
tubes, at 25 g/tube. 
CCP-020 topical ointment and vehicle ointment will each be applied in an amount of 0.2 mL to 
2 sites (2 cm x 2 cm) on the infrascapular area of the subjects’ backs for 24 hours (±4 hours) 
under occlusive patch conditions (Tapemark - Webril™).  The patch will be secured on the edges 
with hypoallergenic tape (3M Micropore®).  This will be repeated twice each week during the 
3-week Induction Phase, once on Monday during rest week 4 as applicable and once at 
Challenge.  One application site of each study product will be irradiated and the other will 
remain non-irradiated. 
CCP-020 topical ointment and vehicle ointment should be stored at room temperature 
(15°C/59°F to 30°C/86°F).  The PI will be responsible for the suitable storage of the IPs in 
compliance with the storage instructions and must restrict access to the investigative personnel 
only.   
Lot numbers will be given in the clinical study report. 
Manufacturer:  
 
 
   
TWi Pharmaceuticals will be responsible for the manufacturing and filling into the primary 
package; aluminum tubes.  TWi Pharmaceuticals will be responsible to package and distribute to 
TKL.  CCP will be responsible for final release of the product.  TKL will be responsible for 
labeling the product upon site delivery. 

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Control 
An untreated irradiated non-occlusive (open) 2 cm x 2 cm site will serve as a control.  
3.4.2. 
Description of Investigational Products  
CCP-020 (Diacerein 1%) topical ointment and vehicle ointment will be supplied in aluminum 
tubes for the clinical study. CCP-020 (Diacerein 1%) topical ointment and vehicle ointment were 
manufactured and packaged in accordance with good manufacturing practice (GMP).   
3.4.3. 
Description of Patch Conditions  
Material evaluated under occlusive patch conditions is applied to a 2 cm x 2 cm Webril® pad 
attached to a non-porous, plastic film adhesive bandage (medical tape).  The patch is secured 
with hypoallergenic tape (Micropore), as needed. 
3.4.4. 
Packaging/Labeling  
The study medication tube label will show at least the following: 
• Protocol number 
• Storage conditions 
• Instructions for use 
• Expiration date 
• Sponsor information 
• Investigational drug warning 
• Space to enter lot number. 
A full product description can be found in the Investigator’s Brochure (IB).1 
All study IPs should be stored at room temperature (15°C/59°F to 30°C/86°F). 
3.4.5. 
Assignment to Treatment  
3.4.5.1. 
Randomization 
Each subject who signs an informed consent form (ICF) will be assigned a screening number.  If 
the subject meets all of the inclusion and none of the exclusion criteria, and successfully 
completes the screening procedures, they will be enrolled in the study.  Upon enrollment, each 
subject will be assigned a unique subject number and receive a randomization code, indicating 
application placement of the study materials.  Each subject in this study will serve as his or her 
own control.  All subjects will receive the IPs and control products at adjacent application sites, 
i.e. study product placement on the left side of the back will be the same as on the right side of 
the back. 
CCP-020 (Diacerein 1%) topical ointment and vehicle ointment will be assigned in a randomized 
sequence to the test sites. The same study material will be applied to the same test site 
throughout the study.   

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3.4.5.2. 
Blinding 
CCP-020 (Diacerein 1%) topical ointment, vehicle ointment, and control will not be blinded to 
investigative personnel involved in the preparation/application and removal of treatments.   
Investigative personnel who are involved in the preparation/application and removal of the 
treatments will be unblinded and will not perform the evaluation of skin responses.  The subjects 
and the trained evaluator who will be evaluating skin responses will be blinded to IPs and the 
treatment allocation; however, because of the demarcations/skin coloration remaining on the skin 
following patch removal, complete blinding of the evaluators cannot be completely assured. 
Investigative personnel who are blinded, including the Investigator and trained evaluator 
involved in the evaluation of responses, will remain blinded during the course of the study until 
Database Lock and finalization of the Statistical Analysis Plan (SAP). 
In the event of an emergency, if possible, the Investigator or designee will contact the Sponsor 
with notification of the intent to unblind the treatment codes prior to the actual unblinding.  If it 
is not possible to notify the Sponsor prior to the unblinding, the Investigator or designee will 
contact the Sponsor immediately following the unblinding procedure and follow with a written 
notification to document the exact manner in which the code was broken and the justification for 
the unblinding. The Investigator will communicate the treatment identification to only the 
investigative personnel who require the information to manage the emergency.  Unblinding will 
happen on site at TKL. 
3.4.6. 
Prior and Concomitant Therapy  
All medications, including over the counter (OTC) drugs and vitamins, taken within 28 days 
prior to the start of the study will be recorded at Screening.  Thereafter, a record of all 
medications taken during the course of the study will be made.  Information regarding the total 
daily dose, route of administration, start and discontinuation dates, and indication are to be 
captured on the subject’s CRF.  
The following prohibitions will apply for the duration of the study:  
• There will be no use of systemic/topical anti-inflammatory analgesics which in the 
opinion of the investigative personnel will interfere with the study results, including 
anti-inflammatory medications such as aspirin (81 mg aspirin will be allowed at the 
discretion of the Investigator), Aleve, Motrin, Advil, or Nuprin for 72 hours prior to 
and during the study (occasional use of acetaminophen will be permitted); 
• Use of sunbeds or sunlamps or deliberate exposure of the test sites to natural sunlight 
or to other sources of UV light; 
• Participation in any other clinical study;  
• Soaking of test areas; and/or 
• Application of any product to the test areas. 
The use of or change in the dose of any and all concomitant medication, either prescription or 
OTC, during the study will be recorded.  The reason for use or change of dose of a concomitant 
therapy may need to be reported as an AE.  Therapies (medication and non-medication therapies) 

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not restricted by the protocol may be used.  Non-prohibited chronic therapies being used at 
Baseline may be continued.   
All topical or systemic medication listed in the exclusion criteria are prohibited during this study.  
See the IB for information about possible drug-drug interactions.1 
3.4.7. 
Treatment Compliance 
All patches will be applied and removed by investigative personnel.  Whereas bathing will be 
allowed (low tub bath/frontal showers), the patched areas are not to be soaked and are to be kept 
as dry as possible, per the instructions to be given to each subject.  Subjects will be instructed to 
contact the Investigator before starting any medication, including OTC remedies.  In the case of 
an emergency treatment, the Investigator must be informed as soon as possible.  A trained, 
experienced evaluator will assess study compliance.   
Records of patch applications and visit schedule compliance will be recorded on the subjects’ 
CRFs. 
3.5. 
Visit Schedule and Assessments  
3.5.1. 
Study Procedures and Visit Schedule 
Screening  
At Screening, the subjects will receive any necessary written and verbal information, and the 
informed consent of each subject will be obtained.  Demographic data (including Fitzpatrick skin 
type) will be recorded, a medical history will be taken, and previous and concomitant 
medications will be reviewed.  Eligibility will be determined by review of the 
inclusion/exclusion criteria.   
• Any written and verbal information 
• Informed consent 
• Demographics 
• Previous/concomitant medication 
• Review of inclusion and exclusion criteria 
• Medical history (including lifestyle and habits) 
• Evaluation of application site area 

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Table 1: 
Fitzpatrick Skin Types  
I 
Always burns easily, never tans 
II 
Always burns easily, tans minimally 
III 
Burns moderately, tans gradually  
IV 
Burns minimally, always tans well  
V 
Rarely burns, tans very well  
VI 
Never burns, deeply pigmented3,4 
Day 1 
On Day 1, all subjects will be questioned regarding the entry criteria and female subjects of 
childbearing potential will undergo a UPT.  If the subject fulfills all the inclusion and none of the 
exclusion criteria, he/she will be allowed participation in the study.  Upon enrollment, each 
subject will be assigned a unique subject number and receive a randomization code, indicating 
application placement of the study products.  
A baseline evaluation of the patch sites will be performed immediately prior to application of the 
patches to ensure that no conditions, markings, or coloration of the skin will interfere with 
interpretation of the study results. 
A total of 4 application sites (2 cm x 2 cm each) will be marked on each subject’s back, placing 2 
sites on opposite sides of the back.  The distance between the patches will be no less than one 
centimeter.  The numbering of the test sites will remain the same throughout the study.  The sites 
will be marked with an indelible, surgical marker.   
Minimal Erythema Dose (MED) Determination 
On Day 1, subjects will have an area of skin on their back, approximately 50 cm2, divided into 
6 equal sites marked with a surgical marker.  Each of the sites will be irradiated with full 
spectrum UV light, with each exposure differing from the next by a factor of 1.25 (ie, each 
irradiated site will be exposed to a 25% greater dose of UV irradiation than the previous site).2 
The areas involved in MED determination will be different from the study product application 
sites.  Evaluation of the exposed sites will be performed on Day 2. 

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Induction 
The Induction Phase consists of a series of 4 patch applications of the study products and 
subsequent irradiation and evaluations of the patch test sites over a 3-week Induction Phase.   
Under occluded conditions, 0.2 mL of each study product, CCP-020 (Diacerein 1%) topical 
ointment and vehicle ointment will be applied to two Webril® pads. The patches will be secured 
with nonporous plastic film adhesive bandage (Blenderm tape) and hypoallergenic paper tape 
(3M MicroporeTM), as needed.  The patches will then be applied to their assigned sites on each 
side of the back for 24 hours (±4 hours).  This process will be repeated twice each week 
(Mondays and Thursdays) during the 3-week Induction Phase.  The same study product will be 
applied to the same test site throughout the Induction Phase.  
Application sites will be evaluated immediately prior to study product application. 
After 24 hours (±4 hours) of study product application (eg, Tuesday and Friday), all patches will 
be removed.  The sites will be evaluated using the scoring system detailed in Section 3.5.7.1.  
One side of the back will be assigned for irradiation and the other will remain non-irradiated, ie, 
only one application site of each study product will receive irradiation.  On all Tuesdays and 
Fridays, the sites designated for irradiation will be irradiated with 2 times the subject’s MED 
using the full Xenon lamp spectrum.   
Adverse events and concomitant medications will be reviewed at each visit and recorded as 
applicable.  
One application/irradiation session may be missed during the Induction Phase.  It must be 
made-up during Week 4.  An additional application of study product may be applied on the 
Monday of rest week 4 if the subject misses an irradiation session during the Induction Phase of 
the study. No evaluation will be required following the final irradiation during the challenge 
period. 
Rest Period (Weeks 4 and 5) 
During the Rest Period of approximately 10-17 days, subjects will not receive any application of 
study materials. An additional application of study product may be applied on the Monday of rest 
week 4 if the subject misses an irradiation session during the Induction Phase of the study. 
Challenge (Week 6) 
On Day 1 of the Challenge Phase, subjects who have completed the Induction Phase and the Rest 
Period will have study product applications to naive sites in the same manner as applied during 
the Induction.  A baseline evaluation of the naïve sites will be performed immediately prior to 
application of the patches to ensure that no conditions, markings, or coloration of the skin will 
interfere with interpretation of the study results.  As in the Induction Phase, 0.2 mL of CCP-020 
(Diacerein 1%) topical ointment and vehicle ointment will each be applied to 2 naive sites for 
approximately 24 hours (±4 hours) under occlusive patch conditions.  The clinical staff will then 
remove the patches and a trained evaluator will evaluate the test sites.  There will be a main 
evaluator for the study; a backup evaluator will also be assigned in the event that an emergency 
occurs and the main evaluator is unable to attend the study visit. The designated sites and an 
additional untreated control site will be irradiated with 6 J/cm2 of UVA (320-400 nm) followed 
by 0.5 times the MED of UVA/UVB (full-spectrum) irradiation, obtained by using a filtered light 

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source (see Section 3.5.4).  Each site will be evaluated again at approximately 24 hours 
(±4 hours), 48 hours (±4 hours), and 72 hours (±4 hours) post irradiation.   
Adverse events and concomitant medications will be reviewed at each visit and recorded as 
applicable.   A UPT will be performed for female subjects of childbearing potential at the last 
study visit. 
Rechallenge  
A Rechallenge should be performed if a cutaneous response observed during the Challenge 
Phase indicates possible photosensitization or at the discretion of the Investigator.  If it is 
determined by the Investigator that a Rechallenge should be performed, the Rechallenge patches 
will be applied as soon as Challenge reactions have resolved.  Just as in the challenge procedure 
0.2 mL of each study product CCP-020 (Diacerein 1%) topical ointment and vehicle ointment, 
will each be applied to 2 naive sites for approximately 24 hours (±4 hours) using appropriate 
patches to further discriminate a photosensitization reaction from an irritation reaction.  A 
baseline evaluation of the naïve sites will be performed immediately prior to application of the 
patches to ensure that no conditions, markings, or coloration of the skin will interfere with 
interpretation of the study results.  Approximately twenty-four (24) hours (±4 hours) after study 
product application, the clinical staff will remove the patches and a trained evaluator will 
evaluate the test sites.  One site of each product and an additional untreated control site will be 
irradiated with 6 J/cm2 of UVA (320-400 nm) followed by 0.5 times the MED of UVB (290-320 
nm) irradiation using a filtered light source.  All sites (irradiated and non-irradiated) will be 
graded for dermal reactions at approximately 24 hours (±4 hours), 48 hours (±4 hours), and 
72 hours (±4 hours) following irradiation.  Concomitant medications and AEs will also be 
reviewed. 
End of Study  
At the EOS, all patches will be removed as described above, and the final evaluations of the test 
sites will be made.   
An EOS examination will be conducted and consist of the following: 
• Concomitant medication 
• AEs 
• UPT in females of childbearing potential 
Concomitant medications and AEs will be reviewed and recorded during the whole study.  For a 
detailed listing of scheduled study time points refer to the Visit Schedule and Assessments 
(Table 2). 
3.5.2. 
Visit Schedule  
A summary of the visit schedule and assessments is presented in Table 2.  

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Table 2: 
Visit Schedule and Assessments  
 
 
Screening 
 
Day 
1a 
(M) 
Induction 
Rest 
Challenge  
(Week 6) 
 
 
 
M 
 
8, 
15 
Tu 
2, 
9, 
16 
Th 
4, 
11, 
18 
F 
5. 
12, 
19 
Week
4 & 5 
M 
Tu 
W 
Th 
F 
Informed consent 
X 
 
 
 
 
 
 
 
 
 
 
 
Inclusion/Exclusion 
X 
X 
 
 
 
 
 
 
 
 
 
 
Medical history 
X 
 
 
 
 
 
 
 
 
 
 
 
Demographic 
information 
X 
 
 
 
 
 
 
 
 
 
 
 
Fitzpatrick Skin 
Typing 
X 
 
 
 
 
 
 
 
 
 
 
 
UPT 
 
X 
 
 
 
 
 
 
 
 
 
X 
MED 
irradiation/evaluation 
 
Xb 
 
 
 
 
 
 
 
 
 
 
Randomization 
 
X 
 
 
 
 
 
 
 
 
 
 
Product application  
 
X 
X 
 
X 
 
 
X 
 
 
 
 
Application site 
evaluations 
 
 
Xc 
X 
X 
Xd 
 
 
X 
X 
X 
X 
Application site 
irradiation  
 
 
 
X 
 
Xd 
 
X 
X 
 
 
 
Make-up evaluation/ 
application 
 
 
 
 
 
 
Xe 
 
 
 
 
 
Make-up evaluation/ 
irradiation 
 
 
 
 
 
 
Xe 
 
 
 
 
 
Review of concomitant 
medications 
X 
X 
X 
X 
X 
X 
Xf 
X 
X 
X 
X 
X 
Review of AEs 
X 
X 
X 
X 
X 
X 
Xf 
X 
X 
X 
X 
X 
a  Screening and the first day of Induction (Day 1) may take place on the same day. 
b MED irradiation on Day 1 and MED evaluation on Day 2. 
c  The first Monday (Week 1) of the Induction Phase. 
d  Evaluations will not be conducted after irradiation on the last Friday of the Induction Phase.  Untreated control 
site will also be irradiated. 
e Make-up evaluation/application and evaluation/irradiation are performed as necessary (see Section 3.5.1). 
f 
Concomitant medications and AEs will be reviewed only for subjects who are required to return to the test 
facility for make-up visits during Rest Period - Week 4.   
Note:  The visit schedule may be revised if necessary. 

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3.5.3. 
Definition of Minimal Erythemal Dose 
Minimal erythemal dose (MED) is defined as the length (in time) of light exposure required to 
produce a minimal erythema reaction 16 - 24 hours after irradiation using a standardized filtered 
UV light source that emits UVB (290-320 nm) as part of its emission spectrum.2 
3.5.4. 
Light source 
The light source will be a Xenon Arc Solar Simulator (150 W), with UV-reflecting dichroic 
mirror, UVC-blocking filter, and visible/infrared blocking filter to generate a continuous 
emission spectrum in the UVA and UVB range (290 to 400 nm).2 An additional filter is added 
during irradiation of the application sites to block UVB radiation allowing only UVA irradiation 
of the sites.  The output is measured daily prior to irradiation using a radiometer/photometer. 
3.5.5. 
Background information 
Date of birth, gender, race, Fitzpatrick skin type (see Table 1), and a significant medical history 
of each subject will be recorded at Screening. 
3.5.6. 
Efficacy Assessments 
No efficacy will be assessed in this study. 
3.5.7. 
Safety Assessments  
3.5.7.1. 
Patch Test Site Evaluations 
For both Induction and Challenge Phases, after 24 hours (±2 hour) of product application, all 
sites will be evaluated and one application site of each product and the additional untreated site 
will be irradiated.  The sites will be examined for dermal reactions at approximately 24 hours 
(±4 hours), 48 hours (±4 hours), and 72 hours (±4 hours) post-irradiation.   
The scores in Table 3 will be used to express the response observed at the time of examination 
and will be recorded on the subjects’ CRFs.  The score will be used for statistical analysis.  
Additional response notations are presented in Table 4. 

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Table 3: 
Response Scores 
 
Response 
Symbol 
Numerical 
Equivalent Score 
Erythema 
 
 
No reaction 
- 
0 
Mild, but definite erythema 
+ 
1 
Moderate erythema 
++ 
2 
Marked/severe erythema 
+++ 
3 
Edema 
 
 
No reaction 
- 
0 
Mild, but definite edema 
** 
1 
Definite edema with erosion/vesiculation 
*** 
2 
Table 4: 
Notations 
Response/Comment 
Notation 
Hyperpigmentation 
Hr 
Hypopigmentation 
Ho 
Vesiculation 
V 
Papular response 
p 
Papulovesicular response 
pv 
Damage to epidermis: oozing, crusting, and/or superficial erosions 
D 
Itching 
I 
Spreading of reaction beyond patch study site (ie, reaction where 
material did not contact skin) 
S 
Follicular irritation with or without pustule formation (folliculitis) 
f 
Subject absent 
X 
Patch dislodged 
PD 
Not patched 
NP 
No reaction 
0 
 
The readings will be made under a standardized white light source.   
 
The 3-week period of patch contact during the Induction Phase may result in tape-related 
irritation in some individuals.  Tape related irritation will not be graded as an irritant response at 
the patch site but will be noted separately on the CRF.   
The Investigator will assess the reactions seen during the Challenge Phase and determine 
whether the subject is photosensitized or not.  The following guidelines are generally considered 
in this assessment.  Not all observations of erythema and edema are associated with 
photosensitivity; only if erythema and edema are observed can a reaction be suspected of being a 
positive photosensitivity reaction.  An increase in the intensity of the reaction over time further 

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supports an assessment of photosensitivity.  If reactions are observed at both the irradiated and 
non-irradiated study product sites (ie, if contact sensitization may have occurred), the reaction at 
the irradiated site upon Rechallenge must be at least one grade more intense than at the 
non-irradiated site for the reaction to be suspected of being a photosensitivity reaction (refer to 
Section 3.5.7.1 for response scores and notations).   
3.6. 
Adverse Events  
3.6.1. 
Method of Determining Adverse Events  
Safety assessments will include recording AEs reported spontaneously by the subject or collected 
by the Investigator.  AEs will be recorded at each visit throughout the study on the appropriate 
CRF.  Every attempt should be made to describe the AE in terms of a diagnosis.  If a clear 
diagnosis has been made, individual signs and symptoms will not be recorded unless they 
represent atypical or extreme manifestations of the diagnosis, in which case they should be 
reported as separate events.   
Subjects should be asked whether, since the time of the last observation or visit, they had any of 
the following:  
• Experience any changes in well-being; 
• Used any new medications;  
• Changed medication regimens (both prescription and OTC); and/or 
• Were admitted to a hospital or had any accidents.  
All questions should be of a general nature and should not suggest symptoms.   
When an AE is suspected, all relevant evaluations will be carried out and appropriate treatment 
provided.  Additional follow-up will be done as necessary (Section 3.6.4) and recorded in the 
subject’s source documents, and the results will be provided to the Sponsor.   
For AE definitions and reporting requirements refer to Section 3.6.2 and Section 3.6.3.  
Note:  Any observed response which can be denoted using the irritation criteria summarized in 
Table 3 and Table 4 will not be considered an AE.  Likewise, any tape-related irritation will only 
be noted as an AE when all patches are discontinued due to tape reaction around all sites (see 
Section 3.6.6). 
3.6.2. 
Adverse Event Definitions 
3.6.2.1. 
Adverse Events  
Information about all local and systemic AEs, whether volunteered by the subject, discovered by 
Investigator questioning, or detected through other means, will be collected and recorded on the 
AE CRF and followed as appropriate.   
An AE is defined as any untoward medical occurrence in a patient or clinical investigation 
subject administered a pharmaceutical product (or cosmetic product), which does not necessarily 
have a causal relationship with this treatment.  An AE can therefore, be any unfavorable and 

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unintended sign, symptom, or disease temporally associated with the use of a medicinal 
investigational product, whether or not considered related to the medicinal investigational 
product.   
Adverse Events will be coded using an internationally recognized dictionary (MedDRA). 
Medical conditions/diseases present before starting study treatment are considered AEs only if 
they worsen after starting study treatment (any procedures specified in the protocol).  Any AEs 
occurring before starting study treatment but after signing the ICF are recorded on the Medical 
History/Current Medical Conditions CRF.  
To the extent possible, each AE will also be described by: 
1. its duration (start and end dates), 
2. the severity grade (mild, moderate, severe)  
3. its relationship to the study drug, 
4. the action(s) taken, and 
5. as relevant, the outcome. 
Note:  Any observed response which can be denoted using the irritation criteria summarized in 
Table 3 and Table 4 will not be considered an AE.  Likewise, any tape-related irritation will not 
be noted as an AE. 
3.6.2.2. 
Serious Adverse Events  
A “SAE” is any AE that: 
• Results in death; 
• Is life-threatening (Note: the term “life-threatening” refers to any AE that, as it 
occurs, puts the subject at immediate risk of death.  It does not refer to an AE that 
hypothetically might have caused death if it were more severe). 
• Results in hospitalization or prolongation of current hospitalization (not including 
hospitalization for a pre-existing condition that has not increased in severity or 
frequency from the subject’s underlying medical condition prior to entry into the 
study). 
• Is a congenital anomaly/birth defect in the offspring of a subject.  
• Is another serious (important medical events) event.  
• Results in persistent or significant disability/incapacity.  
(Note: Important medical events may not be immediately life-threatening or result in death or 
hospitalization but may be considered serious when, based on the appropriate medical judgment, 
they may jeopardize the subject or require medical or surgical intervention to prevent one of the 
outcomes listed above.  Examples of such medical events include allergic bronchospasm 
requiring intensive treatment in an emergency room or at home; blood dyscrasias or convulsions 
that do not result in inpatient hospitalization; or development of drug dependency or drug abuse.) 

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3.6.2.3. 
Severity of Adverse Events 
“Severity” of the AE refers to the extent to which an AE affects the subject’s daily activities and 
differs from “Serious,” which is a regulatory classification.   
The Investigator is to classify the severity of an AE according to the following definitions: 
• Mild: The symptom has a negligible effect or no impairing effect on the subject’s 
normal function.  
• Moderate: The symptom impairs the subject’s normal function to some extent.  
• Severe: The symptom has an obvious, significantly impairing effect on the subject’s 
normal function.  
3.6.2.4. 
Relationship of Adverse Events to Study Treatments 
The Investigator is to classify the drug relationship of an AE according to the definitions outlined 
in Table 5. 
Table 5: 
Relationship of AE to Study Drug 
Association 
Definition 
Not related 
(1) the existence of a clear alternative explanation (e.g., mechanical bleeding at surgical 
site) or (2) non-plausibility, e.g., the subject is struck by an automobile or cancer 
developing a few days after drug administration. 
 
 
Unlikely 
There is no medical evidence to suggest that the AE may be related to study drug usage, 
or there is another more probable medical explanation.  
 
 
Possible  
There is medical evidence to suggest that there is a reasonable possibility that the AE may 
be related to study drug usage. However, other medical explanations cannot be excluded 
as a possible cause. 
 
 
Probable  
There is strong medical evidence to suggest that the AE is related to study drug usage. 
 
 
Definite 
A clinical event, including laboratory test abnormality (if applicable), in which there is no 
uncertainty in its relationship to test drug (e.g., positive Rechallenge). 
3.6.3. 
Reporting Adverse Events 
Adverse events that occur from the time of informed consent through completion of the last 
study visit should be reported.   
Every attempt should be made to describe the AE in terms of a diagnosis.  If a clear diagnosis 
has been made, individual signs and symptoms will not be recorded unless they represent 
atypical or extreme manifestations of the diagnosis, in which case they should be reported as 
separate events.  If a clear diagnosis cannot be established, each sign and symptom must be 
recorded individually.  
Any SAEs occurring in a subject receiving study drug must be reported to the Sponsor within 24 
hours of the site being informed of the event, even if the event does not appear to be drug-

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related.  The report must be made by sending a completed SAE Report form to the Sponsor.  Any 
pertinent follow-up information should be provided in a similar manner.  Contact information is 
provided in Section 3.7.1. 
3.6.4. 
Adverse Event Follow-up 
Any ongoing AE at the time of study completion or withdrawal will be followed until the AE is 
resolved or the subject is referred to his/her own PMD.  The Investigator and the Sponsor will 
decide if longer follow-up is appropriate on a case-by-case basis.  Subjects who experience any 
clinically significant AE will remain under medical supervision until the Investigator or the 
Sponsor’s Medical Monitor deems the AE to be resolved, stabilized, or no longer serious enough 
to warrant follow-up.   
3.6.5. 
Pregnancy reporting  
Prior to study enrollment, females of childbearing potential must be advised of the importance of 
avoiding pregnancy during study participation and the potential risk factors for an unintentional 
pregnancy.  The signed Informed Consent Form must document this discussion.   
A UPT will be performed on all females of childbearing potential at Day 1 (day of first patch 
application) and EOS.  All women of childbearing potential will receive a UPT prior to the first 
study drug administration and the study drug must be withheld until the results of laboratory 
pregnancy testing are available.  If pregnancy is confirmed, the subject must not receive any 
study drug and must not be enrolled in the study.  
3.6.6. 
Expected Adverse Events  
Any observed response in the patch test area that can be denoted using the irritation criteria 
summarized in Table 3 and Table 4 will not be considered an AE.   
Tape related reactions will only be recorded as AEs when the subject is discontinued due to tape 
reaction around all sites.  When 1 or 2 sites are experiencing severe tape related reactions, the 
application site will be stopped and the subject will continue on the study. 
3.7. 
Instructions for Rapid Notification of Serious Adverse Events 
3.7.1. 
Contact person and number  
Serious adverse events must be reported immediately (i.e., not later than 24 hours after first 
knowledge) by e-mail with the scanned TKL SAE report form to: 
 
 
 

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3.7.2. 
Reporting Responsibility  
Any death, SAE, pregnancy, (see Section 3.6), or unusual frequency of AEs, must be reported 
immediately (i.e., not later than 24 hours after first learning of its occurrence) to the Sponsor’s 
study manager by the Investigator, even if the event(s) appear to be unrelated to study treatment.  
Follow-up information about a previously reported SAE or pregnancy must also be reported to 
the Sponsor within 24 hours of receiving it.  If the SAE or pregnancy has not been previously 
documented (i.e., is a new occurrence) and it is thought to be related to the investigational 
product (or therapy), the Sponsor may contact the Investigator to obtain further information.  If 
warranted, an investigator alert may be issued, to inform all Investigators involved in any study 
with the same product (or therapy) that this SAE or pregnancy has been reported.   
The IRB should also be notified of SAEs or pregnancies and of any follow-up information in 
writing, as is practical, and depending on local regulations.   
3.7.3. 
Reporting procedures 
For each SAE, the Investigator will complete a SAE Report Form in English and assess the 
relationship of each SAE to study treatment.  The completed form(s) should be sent by e-mail to 
the Sponsor within 24 hours of first knowledge of the SAE (as outlined in Section 3.7.1 and 
Section 3.7.2).  The initial SAE should be reported immediately, even if only preliminary 
information is available.  Follow-up information should be sent by the same Investigator, 
restating the date of the original report.  Either a new SAE form is sent (stating that it is a follow-
up), or the original one is resent (with the new information highlighted and a new date provided).  
The follow-up should describe whether the event has resolved or continues, if and how it was 
treated, whether the blind was broken or not, and whether the patient continued or discontinued 
study participation.  The form confirmation will be retained. 
Pregnancy follow-up (as outlined in Section 3.6.5) should be reported to the IRB within 24 hours 
of first knowledge on a Pregnancy Report Form.  Follow up will describe the outcome of the 
pregnancy, including any voluntary or spontaneous termination, details of the birth, and the 
presence or absence of any congenital abnormalities or birth defects.   
3.8. 
Appropriateness of Safety Measurements  
The safety assessments in the study are standard safety measures in clinical trials.  

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4. 
STATISTICAL METHODS  
4.1. 
General Considerations for Data Analysis  
The focus of the statistical analysis will be the comparison with controls of the photoallergic 
response to the study products.  The diagnosis of photosensitization response will be made by the 
Investigator based on review of the observed skin responses after Challenge. 
The mean score by subject and treatment, including all scores assigned during Induction, will be 
analyzed in the analysis of variance with factors subject and treatment. All pairwise treatment 
comparisons will be performed.  
All statistical processing will be performed using the SAS® system (version 9.2 or higher).  No 
interim or subgroup analyses are planned. 
4.2. 
Sample Size and Power Considerations 
The sample size of 50 evaluable subjects conforms to industry and regulatory standards for 
determination of irritation/sensitization when topical application to skin is followed by light 
exposure. 
4.3. 
Subject Populations for Analysis 
All subjects who receive treatment will be evaluable for AEs. The evaluation of 
photosensitization will be based on all subjects who complete the Challenge Phase of the study.  
Subjects who completed Challenge are those who have received at least 6 applications/irradiation 
of study products, and at least 11 subsequent evaluations during Induction, completed the Rest 
Phase and have received one application of study products at Challenge, subsequent irradiation 
and at least 4 evaluations (3 post-irradiation evaluations) for that product.  The analysis of local 
tolerability (photo irritation) will be based off all subjects who complete the Induction Phase of 
the study. Subjects who completed Induction are those who have received at least 6 
applications/irradiation of study products, and at least 11 subsequent evaluations during 
Induction. 
4.3.1. 
Background and Demographic Characteristics 
Descriptive statistics will be used to summarize demographic characteristics (age, gender, 
Fitzpatrick skin type, and race) and background characteristics for the randomized subject 
population.  Past/coexistent medical history information for all randomized subjects will be 
presented in a by-subject listing. 
4.3.2. 
Study Product/Visit Compliance 
Descriptive statistics will be used to summarize study product compliance for the randomized 
subject population. 

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4.4. 
Prior and Concomitant Medications 
Prior and concomitant medication information for all randomized subjects will be presented in a 
by-subject listing. 
4.5. 
Efficacy Evaluation 
This section is not applicable to this study. 
4.6. 
Safety Evaluation 
4.6.1. 
Assessment of Responses 
All assigned scores during Induction and Challenge will be summarized by frequency counts by 
time point and treatment.  The incidence of reactions will be summarized by frequency counts 
for each treatment. The mean score by subject and treatment, including all scores assigned during 
Induction, will be analyzed using Fisher’s least significant differences in the analysis of variance 
(ANOVA) with factors subject and treatment. All pairwise comparisons will be performed: 
CCP-020 (Diacerein 1%) topical ointment on both the irradiated and non-irradiated sides, and 
vehicle ointment on both the irradiated and non-irradiated sides. 
4.6.2. 
Photosensitivity 
The determination of dermal photosensitization potential will be made by the Investigator based on 
specific scoring criteria derived from observations in the Challenge Phase of the study and confirmed 
in the Rechallenge Phase, if necessary. The incidence of photosensitization reactions will be 
summarized by frequency counts for each treatment.  If photosensitization occurs, the 
95% confidence interval for the proportion of subjects with photosensitization for each product 
will be calculated.  Photosensitivity will not be determined by statistical methods.   
4.6.3. 
Adverse Events  
Adverse events will be summarized as an overall incidence of at least one event, incidence 
within body systems only, incidence by body system and preferred term, and by highest severity.  
Each subject will contribute only once (e.g., the first occurrence) to each of the rates, regardless 
of the number of occurrences (events) the subject experiences.   
Treatment-emergent AEs will be summarized and tabulated by the system organ class and 
preferred term, by severity (mild, moderate, severe) and by relationship to study product (not 
related, unlikely, possible, probable, and definite).   
Treatment-emergent will be defined as any AE with an onset date on or after the first study 
product administration date.  Any event with a missing onset date will be included as a 
treatment-emergent AE. 
Deaths and SAEs will be listed by subject. 
4.7. 
Other topics 
There are no other topics being evaluated. 

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4.8. 
Interim analyses 
No interim analyses are anticipated. 
4.9. 
Special Methods 
This section is not applicable for this protocol. 

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5. 
ADMINISTRATIVE PROCEDURES 
5.1. 
Ethics and Good Clinical Practice 
This study must be carried out in compliance with the protocol and in accordance with TKL 
Research, Inc.’s standard operating procedures.  These are designed to ensure adherence to Good 
Clinical Practices guidelines, as described in:  
• ICH Harmonized Tripartite Guidelines for Good Clinical Practice 1996.  Directive 
91/507/EEC, The Rules Governing Medicinal Products in the European Community. 
• US 21 Code of Federal Regulations dealing with clinical studies (including parts 50 
and 56 concerning informed consent and IRB/IEC/EEC regulations). 
• Declaration of Helsinki, concerning medical research in humans (Recommendations 
Guiding Physicians in Biomedical Research Involving Human Subjects, Helsinki 
1964 and amendments). 
The PI agrees, when signing the protocol, to adhere to the instructions and procedures described 
in it and thereby to adhere to the principles of GCP that it conforms to. 
5.2. 
Institutional Review Board 
Before implementing this study, the protocol, the ICF and other information to subjects, must be 
reviewed by a properly constituted IRB.  A signed and dated statement that the protocol and 
informed consent have been approved by the IRB must be given to Sponsor before study 
initiation.  This committee must also approve any amendments to the protocol, other than 
administrative ones, and a signed and dated statement of approval must be sent to the Sponsor 
prior to initiation of the amendment procedures.  The name and occupation of the chairman and 
the members of the IRB must also be supplied to Sponsor. 
5.3. 
Informed consent 
The Investigator must explain to each subject (or legally authorized representative) the nature of 
the study, its purpose, the procedures involved, the expected duration, the potential risks and 
benefits involved, and any discomfort it may entail.  Each subject must be informed that 
participation in the study is voluntary, that he/she may withdraw from the study at any time, and 
that withdrawal of consent will not affect his/her subsequent medical treatment or relationship 
with the treating physician. 
This informed consent should be given by means of a standard written statement, written in non-
technical language.  The subject should read and consider the statement before signing and 
dating it, and he/she should be given a copy of the signed document.  No subject can enter the 
study before informed consent has been obtained from him/her, or his/her legally authorized 
representative. 
The ICF is considered to be part of the protocol, and must be submitted by the PI with it for IRB 
approval.  Any changes to the proposed ICF suggested by the PI must be agreed to by Castle 

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Creek Pharmaceuticals, LLC before submission to the IRB and a copy of the approved version 
must be provided to Castle Creek Pharmaceuticals, LLC after IRB approval. 
5.4. 
Declaration of Helsinki 
The PI must conduct the study in accordance with the laws and regulations of the country in 
which the study is conducted, as outlined in the Declaration of Helsinki.  
5.5. 
Changes in Planned Study Conduct  
5.5.1. 
Protocol amendments 
With the exception of changes in the visit schedule and/or administrative changes, any changes 
or additions to this clinical study protocol require a written protocol amendment that must be 
approved by Castle Creek Pharmaceuticals, LLC and the PI before implementation.  
Amendments significantly affecting the safety of subjects, the scope of the investigation or the 
scientific quality of the study, require additional approval by the appropriate IRB.  A copy of the 
written approval of the IRB, which becomes part of the protocol, must be given to Castle Creek 
Pharmaceuticals, LLC.  Examples of amendments requiring such approval are: 
1. an increase in study product dosage or duration of product exposure of subjects, 
2. a significant change in the study design (e.g., addition or deletion of a control group), 
3. an increase in the number of invasive procedures to which subjects are exposed, and 
4. addition or deletion of a test procedure for safety monitoring. 
These requirements for approval should in no way prevent any immediate action from being 
taken by the Investigator or the Sponsor in the interests of preserving the safety of all subjects 
included in the study.  If an immediate change to the protocol is felt to be necessary by the 
Investigator and is implemented by him/her for safety reasons the study Sponsor should be 
notified and the IRB should be informed within 10 working days. 
Amendments affecting only administrative aspects of the study do not require formal protocol 
amendments or IRB approval, but the IRB must be kept informed of such administrative 
changes.  Examples of administrative changes not requiring formal protocol amendments and 
IRB approval that can be treated as administrative amendments include: 
1. changes in the staff used to monitor studies, and  
2. minor changes in the packaging or labeling of the study product. 
5.5.2. 
Other changes in study conduct 
Deviations from the planned study conduct are not permitted; any unforeseen changes in study 
conduct must be reported to the Sponsor and noted in the final clinical study report. 
5.5.3. 
Termination or suspension of study 
Both the Sponsor and the PI reserve the right to terminate or suspend the study at any time.  If 
study termination is necessary, the procedures will be arranged on an individual study basis after 

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review and consultation by both parties.  It is the responsibility of the PI to notify the IRB of the 
termination/suspension and the reason(s).  In terminating the study, the Sponsor and the PI will 
ensure that adequate consideration is given to the protection of the subjects’ interests.   
5.6. 
Data handling and record keeping 
5.6.1. 
Recording of data 
Case report forms will be designed to identify each subject by subject entry number and, where 
appropriate, subject's initials, the product being evaluated, and the results observed.  All entries 
to the CRFs must be made as instructed by the study Sponsor at study initiation.  Data on 
subjects collected on CRFs during the study will be documented in an anonymous fashion, and 
the subject will only be identified by the subject number, and by his/her initials, if also required.  
If, as an exception, it is necessary for safety or regulatory reasons to identify the subject, both the 
study Sponsor and the PI are bound to keep this information confidential.   
The PI must sign the designated page(s) of the CRFs, thereby stating that he/she takes 
responsibility for the accuracy of the data in the entire case record book.  All records will be kept 
in conformance to applicable national laws and regulations. 
The original signed ICF will be attached to each subject’s file.  When the study treatment is 
completed, the ICF will be kept in the appropriate file folder; otherwise a note indicating where 
the records can be located will be made.   
5.6.2. 
Retention of documents 
Storage is maintained for 5 years or until the Sponsor advises to release the archives at either the 
TKL facility at One Promenade Blvd. Suite 1101/1201, Fair Lawn, NJ 07410 in a secured room 
accessible only to TKL employees, or at an offsite location that provides a secure environment 
with burglar/fire alarm systems, camera detection, and controlled temperature and humidity.  
Originals or copies of the CRFs, source documents, correspondence, IRB documents, study 
reports, etc. will be available for the Sponsor's review on the premises of TKL or at a secure 
location off-site.  All database management activities can be found in the data management plan 
(DMP).   
5.7. 
Product handling and accountability 
All product supplies are to be used only for this clinical study and not for any other purpose.  
Study product supplies must be kept in an appropriate, secure area (e.g., locked cabinet) and 
stored according to the conditions specified on the product labels.   
The PI or a designee must maintain a full record of the shipment and application of study product 
in a product accountability ledger.  This log must be kept current and should contain the 
following information: 
• identification of the subject to whom the study product was dispensed, 
• date(s) of the study product dispensed to the subject, and 
• initials of the study site representative(s) dispensing study product. 

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The inventory must be available for inspection by the study monitor.  A product-inventory and 
storage-facility inspection will be conducted at appropriate time intervals throughout the clinical 
investigation, depending on enrollment and the length of the study.  Any discrepancy and/or 
deficiency must be accounted for by the PI or his/her designee. 
The PI must not destroy any product labels, or any partly used or unused product supply.  At the 
conclusion of the study and, as appropriate, during the course of the study, all study product 
supplies, including partially used or empty containers, must be returned according to the 
designation of the Sponsor.  Any missing supplies will be indicated on the inventory; the original 
inventory list will be retained in the PI’s records for this clinical study. 
5.8. 
Quality control and quality assurance 
5.8.1. 
Monitoring procedures 
During the study, the Sponsor may visit the site regularly to check the completeness of subject 
records, the accuracy of entries on the CRFs, the adherence to the protocol and to ICH-GCP 
guidelines, the progress of enrollment, and also to ensure that study product is being stored, 
dispensed and accounted for according to specifications.  Key investigative personnel will be 
available to assist the field monitor during these visits. 
The data required by the protocol must be recorded on the appropriate CRFs.  The CRFs and any 
source documents will be available to the study monitor who will perform a 100% data check 
(comparison of the data recorded in the CRF with those in the source documents).  The CRFs 
and source data will also be available for an audit by the Sponsor or the FDA at any time.  
The Investigator will give the monitor access to relevant clinical records, to confirm their 
consistency with the CRF entries.  No information in these records about the identity of the 
subjects will leave the study center.  Additional checks of the consistency of the source data with 
the CRFs are performed according to the study-specific monitoring plan. 
5.8.2. 
Auditing procedures 
In addition to the routine monitoring procedures, a study center may be audited in depth for 
study quality assurance by the Sponsor, an external auditor on behalf of the Sponsor, and/or by 
regulatory authorities.  This audit may include a review of all source documents, drug records, 
and original CRFs the study site used in this study.  Patient confidentiality will be maintained at 
all times and consent for this will be obtained before entry of the patient into the clinical study 
(see Section 5.3).  If an inspection is requested by a regulatory authority, the PI must 
immediately inform the study Sponsor that this request has been made. 
5.9. 
Confidentiality and publication policies 
5.9.1. 
Disclosure and confidentiality 
By signing the protocol, the PI agrees to keep all information provided by the Sponsor in strict 
confidence and to request similar confidentiality from his/her staff and the IRB.  Study 
documents provided by the Sponsor (protocols, IBs, CRFs and other material) will be stored 
appropriately to ensure their confidentiality.  The information provided by the Sponsor to the PI 

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may not be disclosed to others without direct written authorization from the Sponsor, except to 
the extent necessary to obtain informed consent from subjects who wish to participate in the 
study.   
5.9.2. 
Communication and publication of results 
Any formal presentation or publication of data from this study will be considered as a joint 
publication by the Investigator(s) and appropriate Sponsor personnel.  Authorship will be 
determined by mutual agreement.   
Castle Creek Pharmaceuticals, LLC must receive copies of any intended communication in 
advance of publication (at least 15 working days for an abstract or oral presentation and 45 
working days for a journal submission).  The Sponsor will review the communications for 
accuracy (thus avoiding potential discrepancies with submissions to health authorities), verify 
that confidential information is not being inadvertently divulged and provide any relevant 
supplementary information. 

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6. 
REFERENCES 
1. Investigator’s Brochure. CCP-020 (Diacerein 1%) Topical Ointment. Castle Creek 
Pharmaceuticals, LLC. Version Number 1.0. 04 November 2016. 
2. Berger DS. Specification and design of solar ultraviolet simulators. Journal of 
Investigational Dermatology. 1969; 53:192-199. 
3. Fitzpatrick TB. The validity and practicality of sun-reactive skin types I through VI. 
Arch.Dermatol. 1988; 124: 869-871. 
4. Sachdeva S. Fitzpatrick skin typing: Applications in dermatology. Indian J Dermatol 
Venereol Leprol 2009; 75:93-6