RecruitingPhase 2Drug trialAcalabrutinib Plus Rituximab for the Treatment of Elderly or Low- to Intermediate-Risk Younger Untreated Mantle Cell LymphomaThis is a single- arm, open-label, multicenter, phase II study to evaluate Acalabrutinib plus Rituximab for the treatment of elderly or low- to intermediate-risk younger untreated mantle cell lymphoma