S203: ABSCOPAL EFFECT OF RADIOTHERAPY AND NIVOLUMAB IN RELAPSED OR REFRACTORY HODGKIN LYMPHOMA: PRE-PLANNED INTERIM ANALYSIS OF THE INTERNATIONAL GHSG PHASE II AERN TRIAL by P. Bröckelmann, I. Bühnen, J. Zijlstra, A. Fossa, J. Meissner, S. Mathas, J. Rosenbrock, C. Kobe, M. Fuchs, A. Plütschow, S. Marnitz, P. Borchmann, A. Engert, C. Baues

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