Rationale and Design of a Novel, Phase 3, External and Synthetic Placebo-Controlled Clinical Trial of Ritlecitinib 50 mg and 100 mg for Alopecia Areata
Bibliographic record
Abstract
INTRODUCTION: Despite recent advancements in treating severe alopecia areata (AA), many patients do not achieve target efficacy with approved therapies. Ritlecitinib is an oral Janus kinase 3 (JAK3)/tyrosine kinase expressed in hepatocellular carcinoma (TEC) family kinase inhibitor approved to treat severe AA at a dose of 50-mg once daily (QD). A new phase 3 clinical trial (NCT06873945) described herein evaluates a higher dose of ritlecitinib (100-mg QD) in patients with AA. The study employs an innovative design using patient-level data from patients with similar baseline characteristics from previous AA ritlecitinib studies to form an external placebo control group, a synthetic placebo control group (extrapolating for outcomes over a longer timeframe than captured previously), and an external ritlecitinib 50-mg nonresponders group, eliminating the need to randomize patients to placebo. METHODS: This randomized, double-blind clinical trial investigates the efficacy and safety of ritlecitinib in patients aged ≥ 12 years with AA and ≥ 50% scalp hair loss. Patients are randomized to ritlecitinib 100-mg or 50-mg QD. Those randomized to ritlecitinib 100-mg continue the 100-mg dose through week 48. Patients randomized to ritlecitinib 50-mg with a Severity of Alopecia Tool (SALT) score ≤ 20 at week 24 (responders) continue ritlecitinib 50-mg through week 48; nonresponders at week 24 are rerandomized 2:1 to increase to ritlecitinib 100-mg or continue ritlecitinib 50-mg through week 48. PLANNED OUTCOMES: The primary end point is a SALT score ≤ 20 at week 24 for ritlecitinib 100-mg versus external placebo. Key secondary end points include SALT score ≤ 20 at week 24 for ritlecitinib 50-mg versus external placebo and week 36 for ritlecitinib 100-mg versus synthetic placebo, and SALT score change from baseline at week 24 for ritlecitinib 100-mg versus 50-mg. An external ritlecitinib 50-mg nonresponders control group augments the ritlecitinib 50-mg nonresponders at week 24 rerandomized to ritlecitinib 50-mg to support comparative analyses at week 48. GOV REGISTRATION: NCT06873945. Video Abstract (MP4 303790 kb).
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.029 | 0.013 |
| Meta-epidemiology (narrow) | 0.004 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.002 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.002 | 0.004 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.004 | 0.005 |
| Insufficient payload (model declined to judge) | 0.015 | 0.005 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".