RecruitingPhase 4Drug trialAtezolizumab and Bevacizumab in Combination With Y^90 Radioembolization in HCC for Liver TransplantA single institution, single arm, two-cohort feasibility trial to evaluate the combination of locoregional Y\^90 therapy with systemic atezolizumab and bevacizumab, in participants presenting with hepatocellular carcinoma (HCC) 1) within Milan Criteria (MC) with AFP ≥ 400 ng/ml as a means of bridge therapy prior to transplant, 2) beyond the Milan Criteria (MC) (within USCF DS criteria and all comers), as a means of downstaging prior to liver transplantation.