This phase 2 study evaluated the activity and safety of ibrutinib, a Bruton's tyrosine kinase inhibitor, plus rituximab in adults with previously untreated follicular lymphoma. Patients received once-daily ibrutinib 560mg continuously plus once-weekly rituximab 375mg/m2 for 4weeks beginning Week 1 (Arm 1, n=60) or Week 9 (following an 8-week ibrutinib lead-in) to explore biomarkers (Arm 2, n=20). The primary endpoint was the best overall response rate (ORR). The median age was 58years; most had an Eastern Cooperative Oncology Group Performance Status of 0 (74%) and Stage III/IV disease (84%). At a median study follow-up of 34months in Arm 1 and 29months in Arm 2, ORRs were 85% [95% confidence interval (CI) 73-93] and 75% (95% CI 51-91), respectively, with complete responses in 40% and 50%. The median duration of response was not reached in either arm; 30-month progression-free and overall survival rates were 67% and 97% (Arm 1) and 65% and 100% (Arm 2). The most common adverse events were fatigue, diarrhoea and nausea. Higher grade (Grade 3/4) haematological, haemorrhagic and cardiac events occurred infrequently. Ibrutinib plus rituximab was active and tolerable in first-line follicular lymphoma.
View details for DOI 10.1111/bjh.16424
View details for PubMedID 32180219