A Study of BR Alone Versus in Combination With Acalabrutinib in Subjects With Previously Untreated MCL

To evaluate the efficacy of acalabrutinib in combination with bendamustine and rituximab (BR) compared with placebo plus BR based on Independent Review Committee (IRC) assessment of progression-free survival (PFS) per the Lugano Classification for Non-Hodgkin Lymphoma (NHL) in subjects with previously untreated mantle cell lymphoma (MCL).