RADIOTHERAPY TO BULKY DISEASE PET‐NEGATIVE AFTER IMMUNOCHEMOTHERAPY CAN BE SPARED IN ELDERLY DLBCL PATIENTS: RESULTS OF a PLANNED INTERIM ANALYSIS OF THE FIRST 187 PATIENTS WITH BULKY DISEASE TREATED IN THE OPTIMAL > 60 STUDY OF THE DSHNHL. (June 2017) - Pfreundschuh, M.; Christofyllakis, K.; Altmann, B.; Ziepert, M.; Haenel, M.; Viardot, A.; Neubauer, A.; Held, G.; Truemper, L.; Dreyling, M.; Kanz, L.; Hallek, M.; et al.