This study evaluates the addition of Acalabrutinib to current standard therapy of Rituximab, Cyclophosphamide, Doxorubicin, Vincristine and Prednisolone (R-CHOP) for patients with previously untreated CD20 positive Diffuse Large B-cell Lymphoma (DLBCL) requiring full course chemoimmunotherapy. All patients will receive one cycle of R-CHOP. Two thirds of patients (Arm B) will go on to receive a further 5 cycles (every 21 days) of R-CHOP with Acalabrutinib. Acalabrutinib will be taken orally twice daily continuously in 21 day cycles. One third of patients (Arm A) will continue with 5 cycles of R-CHOP. Patients will be followed up initially for 24 months and then for disease status and survival until 114 progression events have been observed.
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To establish if combining acalabrutinib with R-CHOP improves efficacy, compared to RCHOP alone, for the treatment of previously untreated patients with DLBCL to a degree that justifies further development of this approach.
Timeframe: Last patient's last follow up, approximately 4.5 years. Patients who do not experience a PFS event will be censored at the date of last follow up.