CASE SERIES OF NIVOLUMAB TREATMENT IN PATIENTS WITH RELAPSED/REFRACTORY HIV‐RELATED LYMPHOMAS. (12th June 2019) - Rogacheva, Y.; Popova, M.; Nekrasova, A.; Tsygankov, I.; Lepik, K.; Stelmah, L.; Moiseev, I.; Bondarenko, S.; Baykov, V.; Mikhaylova, N.; Afanasyev, B.