A Study to Investigate the Efficacy, Safety, and Pharmacokinetics of Oral Rilzabrutinib Compared With Placebo in Participants 18 Years of Age and Older With Warm Autoimmune Hemolytic Anemia (LUMINA 3)

This is a parallel-group, Phase 3, double-blind, 2-arm study to investigate the efficacy, safety, PK and PD of oral rilzabrutinib in achieving durable Hb response (DHR) compared with placebo in approximately 90 male and female participants ≥ 18 years of age with a confirmed diagnosis of primary wAIHA. Following a 4-week screening period, eligible participants will be randomized in a 2:1 ratio to receive rilzabrutinib or placebo in primary analysis period (PAP) for a duration of up to 24 weeks. All participants who completed PAP will then continue in open-label period (OLP) to receive rilzabrutinib for a duration of 28 weeks. Upon the completion of OLP, only participants who demonstrate Hb increase during the last 8 weeks of OLP per specified criteria in the protocol will be eligible to continue in long-term extension (LTE) of the study. The duration of the LTE period will be from the first-participant-in (FPI)-LTE until the last participant completes 52 weeks in LTE. The safety follow-up period of this study following treatment completion or discontinuation will be 2 weeks.

• Proportion of participants achieving DHR. DHR is defined as an increase of Hb by ≥2 g/dL from baseline on at least two thirds of evaluable scheduled visits between Week 12 and Week 24 (inclusive) in the PAP

1. Study completion expected

   Dec 26, 2029

2. Primary completion expected

   May 31, 2028

3. Last registry update

   Oct 20, 2026

4. Started

   Aug 18, 2025

5. Registered

   Jul 25, 2025