SAFETY AND EFFICACY OF COMBINATION OF BRENTUXIMAB VEDOTIN AND NIVOLUMAB IN RELAPSED / REFRACTORY HODGKIN LYMPHOMA: a TRIAL OF THE ECOG‐ACRIN CANCER RESEARCH GROUP (E4412). (June 2017) - Diefenbach, C.S.; Hong, F.; David, K.; Cohen, J.; Roberston, M.; Advani, R.; Palmisano, N.; Ambinder, R.; Kahl, B.; Ansell, S.