RecruitingDrug trialAvo In R/R And Previously Untreated MCLThis research study is evaluating the combination of three drugs - acalabrutinib, venetoclax, and obinutuzumab - as a possible treatment for relapsed or refractory and untreated mantle cell lymphoma (MCL). The names of the study drugs involved in this study are: * Acalabrutinib * Venetoclax * Obinutuzumab