Safety and Efficacy of A-101 Hydrogen Peroxide Topical Solution 40% in Adults With Seborrheic Keratosis: Results From the Phase 3, Randomized, Double-Blind, Vehicle-Controlled Study Zoe D. Draelos, MD,1 Steven E. Kempers, MD,2 Stacy R. Smith, MD,3 David C. Wilson, MD,4 Christopher V. Powala,5 Mark Bradshaw, PhD,6 Esther Estes, MD, MPH,5 Stuart D. Shanler, MD, FAAD, FACMS5 1Dermatology Consulting Services, High Point, NC; 2Minnesota Clinical Study Center, Fridley, MN; 3California Dermatology & Clinical Research Institute, Encinitas, CA; 4The Education and Research Foundation, Inc., Lynchburg, VA; 5Aclaris Therapeutics, Malvern, PA; 6Global Consulting Partners in Medical Biometrics, New York, NY Introduction • Seborrheic keratosis (SK) is a common cutaneous lesion that affects more than 83 million Americans,1 particularly those who are middle-aged and older. While benign, these lesions are cosmetically unacceptable to many patients. • Malignancy concerns following the appearance of lesions act as a primary driver for a patient to seek medical advice. • Removal of SKs is often performed for cosmetic reasons, but it may be indicated for inflamed, pruritic, or painful lesions. • Prior to December 2017, there was no US FDA–approved drug for the treatment of SKs. Ablative/destructive procedures (eg, cryosurgery, electrodessication/curettage, etc) had been available; however, their efficacy and safety have not been rigorously evaluated in well-controlled clinical trials, and they often involve burning, cutting, or freezing. • A noninvasive, well-tolerated, topical agent for the removal of SKs is an important unmet need. • A-101 is a patented topical formulation based on a high concentration of hydrogen peroxide (40% w/w) for asymptomatic SK.2 • Phase 2 studies showed that a numerically greater percentage of subjects achieved lesion clearance when treated with A-101 40% versus A-101 32.5%; both concentrations achieved significantly greater clearance than placebo.3 • The purpose of this study (A-101-SEBK-301; NCT02667236) was to evaluate the safety and efficacy of A-101 40% versus its matching vehicle for the treatment of SK. Materials and Methods Patients and Study Design • Multicenter, phase 3, randomized, double-blind, vehicle-controlled study. Patients were randomized 1:1 to receive A-101 or matching vehicle. • Eligible patients: aged ≥ 18 years with 4 eligible lesions, identified by study investigator. • Eligible target lesions were stable, typical SKs, measuring 5-15 mm in both width and length, 1-2 mm in thickness, and Physician’s Lesion Assessment (PLA) grade ≥ 2 (Table 1).4 Patients were required to present with ≥ 1 SK on the trunk or extremities and ≥ 1 SK on the face. — Target SKs could not be on the eyelid, within 5 mm of the orbital rim, in an intertriginous area, or pedunculated. Table 1: Validated Physician’s Lesion Assessment (PLA)3 Scale Grade Descriptor 0 Clear: No visible SK 1 Near Clear: A visible SK with a surface appearance different from the surrounding skin (not elevated) 2 Thin: A visible SK (≤ 1 mm) 3 Thick: A visible SK (> 1 mm) Table 2: > 90% of SKs Without Local Dyspigmentation or Scarring No Reaction Mild Moderate Severe Hypopigmentation A-101 40% Vehicle 97.7% 99.9% 2.3% 0.1% 0.0% 0.0% 0.0% 0.0% Hyperpigmentation A-101 40% Vehicle 93.8% 99.8% 5.6% 0.1% 0.6% 0.1% 0.0% 0.0% Scarring A-101 40% Vehicle 99.3% 100.0% 0.6% 0.0% 0.1% 0.0% 0.0% 0.0% Conclusions • A-101 (hydrogen peroxide) topical solution, 40% (w/w) is a safe, effective, and well-tolerated treatment for seborrheic keratoses (Figure 3). • For SKs on the face and cosmetically sensitive locations, A-101 was highly effective, with very low occurrence of hypopigmentation and/or scarring. • On December 14, 2017, A-101 (hydrogen peroxide) topical solution, 40% (w/w) was approved by the FDA as the first and only topical treatment for raised seborrehic keratoses. References 1. Bickers DR, et al. J Am Acad Dermatol. 2006;55:490-500. 2. Simionescu O, et al. J Cell Mol Med. 2012;16:1223-1231. 3. DuBois JC, et al. Dermatol Surg. 2017; doi: 10.1097/DSS.0000000000001302. 4. Data on file. Aclaris Therapeutics Inc., 2014, Malvern, PA, USA. Acknowledgments This study was funded by Aclaris Therapeutics, Inc. Editorial support for this poster was provided by PAREXEL and funded by Aclaris Therapeutics, Inc. Figure 3: Patient Photos of SK, Before and After A-101 Treatment Female, Forehead (met Primary Endpoint) Female, Temple (did not meet Primary Endpoint) PLA 3 Baseline PLA 3 Baseline Clear PLA 0 Day 106 Near Clear PLA 1 Day 106 • All treatments were performed by a nonphysician subinvestigator to maintain blinding. After initial treatment on Day 1, SKs with a PLA score > 0 were retreated on Day 22. At Day 106, the investigator assessed the SKs using the validated PLA scale. Endpoints • Primary efficacy endpoint: percent of patients with complete clearance (PLA = 0) of all 4 SKs at 106 days after first treatment. • Secondary endpoint: percent of patients with complete clearance (PLA = 0) in at least 3 of 4 SKs. • Exploratory endpoints: — Mean per-patient percent of SKs judged Clear/Near Clear (PLA ≤ 1). — Mean per-patient percent of SKs on the face judged Clear/Near Clear (PLA ≤ 1). • Safety: adverse events (AEs), local skin reactions. Results • A total of 450 patients were enrolled—220 of 223 and 226 of 227 patients randomized to A-101 and vehicle, respectively, completed the study. • Demographic characteristics were similar across all treatment groups. • Mean age of patients was 69 years (range, 42–90). 59% of subjects were women, and 97.8% (440) were Caucasian. • Fitzpatrick types 1 to 5 were represented: — Type 1: 72 (16.0%); Type 2: 211 (46.9%); Type 3: 123 (27.3%); Type 4: 40 (8.9%); Type 5: 4 (0.9%). Efficacy Primary and Secondary Endpoints • Significantly more patients receiving A-101 completely cleared (PLA = 0) all 4 of 4 SKs (4.0% vs 0%, P < 0.002) and 3 of 4 SKs (13.5% vs 0%, P < 0.0001) versus vehicle in the primary and secondary endpoints, respectively, at Day 106 (Figure 1). Exploratory Endpoints • Significantly higher mean per-patient percentage of SKs achieving Clear/Near Clear (PLA ≤ 1) was observed in the A-101 arm (48% vs 10% at Day 106) (Figure 2A). • Significantly higher mean per-patient percentage of facial SKs achieving Clear/Near Clear (PLA ≤ 1) was also observed in the A-101 arm (64% vs 15% at Day 106) (Figure 2B). Figure 1: Percentage of Patients with Complete Clearance (PLA 0) of all 4 SKs (A) and at Least 3 of 4 SKs (B) 0 2 1 3 4 5 6 7 8 9 10 Day 106 0 A B 0 Day 106 P at ie n ts , % 0 6 8 10 12 14 4 2 16 P at ie n ts , % 4% 13% P < 0.002 P < 0.0001 Vehicle A-101 40% 0 20 10 30 40 50 60 70 Se b or rh e ic K e ra to se s, % 0 30 20 10 40 50 60 70 Se b or rh e ic K e ra to se s, % 48% 64% 10% 15% A B Day 106 Day 106 Vehicle A-101 40% Figure 2: Mean Per-Patient Percent of SKs (A) or Facial SKs (B) Judged to be Clear/Near Clear (PLA ≤ 1) Safety • AEs were comparable between groups: 54 (24.2%) patients in the A-101 group versus 45 (19.8%) patients in the vehicle group. — The most frequently reported treatment-emergent AEs were nasopharyngitis (1.3% A-101 vs 3.1% vehicle), bronchitis (1.3% A-101 vs 0.4% vehicle), and upper respiratory tract infection (0.4% A-101 vs 1.3% vehicle). — 4 (1.8%) patients in the A-101 group had 4 serious AEs (SAEs) versus 6 (2.6%) patients in the vehicle group who had 7 SAEs. All SAEs were considered not related to study medication. • Local skin reactions were predominantly mild and had generally resolved by Day 106 (Table 2). • At all visits, atrophy, erosion, hypopigmentation, scarring, or ulceration were reported for ≤ 4% of SKs. GS1444 236102 ACLARIS Winter Clinical A101 3.5ft x 7ft S05.indd 1 20/12/2017 10:33