Post-marketing surveillance of tirabrutinib in 189 patients with r/r primary central nervous system lymphoma.

Background: This post-marketing surveillance evaluated the safety and effectiveness of tirabrutinib in patients with relapsed/refractory primary central nervous system lymphoma (r/r PCNSL) in a real-world setting in Japan.

Methods: All patients with r/r PCNSL who started treatment with tirabrutinib between May 20 and 31 October 2020, were registered. Adverse drug reactions (ADRs) and effectiveness were assessed over 52-weeks from the start of tirabrutinib treatment.

Results: Of the 189 patients assessed for safety, 52.4% were male, the median age was 70.0 years (range 30-88), and 49.2% of patients had a Karnofsky performance status score of ≤60. ADRs of any grade and grade ≥3 were observed in 55.6% and 24.3% of patients, respectively. The most common ADRs were rash (11.6%), neutrophil (10.1%) and platelet (5.3%) count decreased. Most of the ADRs corresponding to infections, clinically significant skin disorders, myelosuppression, hypersensitivity, interstitial lung diseases, hepatic function disorders, and hemorrhages resolved or were in the process of resolving. Among the 121 patients assessed for effectiveness, the overall response rate evaluated by the treating physicians was 61.2%, and the 365-day survival rate was 69.8%.

Conclusion: This surveillance confirmed the tolerability and effectiveness of tirabrutinib in patients with r/r PCNSL in the real-world setting.

Clinical trial registration: Japan Registry of Clinical Trials: jRCT2011210002.