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The efficacy and safety of ritlecitinib were evaluated in one randomized, double-blind, placebo-controlled trial(Trial AA-I) in subjects 12 years of age and older with alopecia areata with ≥50% scalp hair loss, including alopecia totalis (AT) and alopecia universalis (AU).
Trial AA-I evaluated a total of 718 subjects who were randomized to one of the following treatment regimens for 48 weeks: 1) 200 mg once daily for 4 weeks followed by 50 mg once daily for 44 weeks; 2) 200 mg once daily for 4 weeks followed by 30 mg once daily for 44 weeks; 3) 50 mg once daily for 48 weeks; 4) 30 mg once daily for 48 weeks; 5) 10 mg once daily for 48 weeks; 6) placebo for 24 weeks followed by 200 mg once daily for 4 weeks and 50 mg once daily for 20 weeks; or 7) placebo for 24 weeks followed by 50 mg once daily for 24 weeks.The recommended dose of ritlecitinib is 50 mg once daily and the results for this dose are discussed below.
Across all treatment groups 62% of subjects were female, 68% were White, 26% were Asian, and 4% were Black or African American. The majority of subjects (85%) were adults (≥18 years of age) with a mean age of 33.7 years. A total of 105 (15%) subjects 12 to <18 years of age and 20 (3%) subjects 65 years of age and older were enrolled. The mean baseline Severity of Alopecia Tool (SALT) score ranged from 88.3 to 93.0 across treatment groups; among subjects without AT/AU at baseline, the mean SALT score ranged from 78.3 to 87.0. The majority of subjects had abnormal eyebrows (83%) and eyelashes (75%) at baseline across treatment groups. The median duration since alopecia areata diagnosis was 6.9 years and the median duration of the current alopecia areata episode was 2.5 years. Randomization was stratified by AT/AU status with 46% of subjects classified as AT/AU based upon a baseline SALT score of 100.
from FDA，2023.06
