The 5-year follow-up of a real-world observational study of patients in the United Kingdom and Ireland receiving ibrutinib for relapsed/refractory mantle cell lymphoma.

: This is a 5-year real-world study of 65 patients treated with ibrutinib for relapsed/refractory mantle cell lymphoma across the UK and Ireland. Ibrutinib was well tolerated with no fatal adverse events. The median progression-free survival and overall survival (OS) was 12 and 18·5 months, respectively. Overall, 80% of patients discontinued treatment, predominantly for progressive disease. On discontinuation, 20% received alternative immunochemotherapy with a median OS of 24 months. Ibrutinib was used as a bridge to transplant in 8% (median OS not reached). These observations are comparable with trial outcomes with encouraging responses to immunochemotherapy at relapse.