P1254: RESPONSE TO DA-EPOCH-R IN PATIENTS WITH HIGH GRADE B CELL LYMPHOMA IS ASSOCIATED WITH A REDUCTION OF PD1 POSITIVE EXHAUSTED CD8 T CELLS. (23rd June 2022) - de Jonge, V.; Duetz, C.; Bruins, W.; van Werkhoven, E.; Nijland, M.; de Heer, K.; van der Poel, M.; Sandberg, Y.; Klerk, C.; de Jong, D.; Zijlstra, J.; Kersten, M. J.; et al.