A Study of Rilzabrutinib in Adult Patients With Immune Thrombocytopenia (ITP)

Summary

This was a 2 part (Part A and B) adaptive, open-label, dose-finding study of PRN1008 in patients with ITP who are refractory or relapsed with no available and approved therapeutic options, with a platelet count \<30,000/μL on two counts no sooner than 7 days apart in the 15 days before treatment begins. The dose-finding portion of the study was completed. Part B treatment dose was 400 mg twice daily.

Timeline

Start

2018-03-22

Primary completion

2023-01-31

Completion

2025-12-11

Publications

• Cooper N, Jansen AJG, Bird R, Mayer J, Sholzberg M, Tarantino MD, Garg M, Ypma PF, McDonald V, Percy C, Kostal M, Goncalves I, Bogdanov LH, Gernsheimer TB, Diab R, Yao M, Daak A, Kuter DJ. Efficacy and Safety Results With Rilzabrutinib, an Oral Bruton Tyrosine Kinase Inhibitor, in Patients With Immune Thrombocytopenia: Phase 2 Part B Study. Am J Hematol. 2025 Mar;100(3):439-449. doi: 10.1002/ajh.27539. Epub 2025 Jan 22.
• Kuter DJ, Mayer J, Efraim M, Bogdanov LH, Baker R, Kaplan Z, Garg M, Trneny M, Choi PY, Jansen AJG, McDonald V, Bird R, Gumulec J, Kostal M, Gernsheimer T, Ghanima W, Daak A, Cooper N. Long-term treatment with rilzabrutinib in patients with immune thrombocytopenia. Blood Adv. 2024 Apr 9;8(7):1715-1724. doi: 10.1182/bloodadvances.2023012044.
• Kuter DJ, Efraim M, Mayer J, Trneny M, McDonald V, Bird R, Regenbogen T, Garg M, Kaplan Z, Tzvetkov N, Choi PY, Jansen AJG, Kostal M, Baker R, Gumulec J, Lee EJ, Cunningham I, Goncalves I, Warner M, Boccia R, Gernsheimer T, Ghanima W, Bandman O, Burns R, Neale A, Thomas D, Arora P, Zheng B, Cooper N. Rilzabrutinib, an Oral BTK Inhibitor, in Immune Thrombocytopenia. N Engl J Med. 2022 Apr 14;386(15):1421-1431. doi: 10.1056/NEJMoa2110297.
• Del Pozo Martin Y. 2021 ASH annual meeting. Lancet Haematol. 2022 Feb;9(2):e92-e93. doi: 10.1016/S2352-3026(21)00384-7. Epub 2021 Dec 16. No abstract available.

Drugs

Indications