P1080: COMPARISON OF NIVOLUMAB 40 MG EFFICACY VERSUS 3 MG/KG IN PATIENTS WITH RELAPSED AND REFRACTORY CLASSIC HODGKIN LYMPHOMA. (23rd June 2022) - Fedorova, L.; Lepik, K.; Mikhailova, N.; Kondakova, E.; Komarova, Y.; Popova, M.; Kotselyabina, P.; Borzenkova, E.; Baykov, V.; Moiseev, I.; Kulagin, A.