MT2022-60: Ph 2 Study of Pembro+ BEAM With ASCT for Relapsed Hodgkin Lymphoma

Inclusion Criteria: * Eligible for autologous stem cell transplant (ASCT) with BEAM conditioning regimen * KPS greater than 70 or ECOG ≤ 1 * Adequate organ function and blood counts within 14 days of study registration * Participants who are HBsAg positive are eligible if they have received HBV anti-viral therapy for at least 4 weeks, and have undetectable HBV viral load prior to randomization. * Participants with a history of HCV infection are eligible if HCV viral load is undetectable at screening. * HIV-infected participants must have well-controlled HIV on ART Exclusion Criteria: * Patients with prior history of any grade 2 or higher autoimmune reaction to PD-1 inhibitors, necessitating permanent discontinuation of the PD-1 inhibitor or necessitating systemic immunosuppressants. * Has received prior radiotherapy within 2 weeks of start of study intervention or radiation-related toxicities requiring corticosteroids. * Has received a live vaccine or live-attenuated vaccine within 30 days before the first dose of study intervention. Administration of killed vaccines is allowed. * Has received any chemotherapy within 3 weeks prior to the first dose of study intervention * Has known active CNS disease. * History of or active autoimmune disease, or other syndrome that requires systemic steroids or autoimmune agents. Exceptions: Participants with vitiligo, resolved childhood asthma or atopy, hypothyroidism, or Sjogren's syndrome, as well as participants requiring only intrana…