P858: EPIGENETIC REGULATION OF CD155 ON MULTIPLE MYELOMA CELLS INFLUENCES ANTI-TUMOR T-CELL CYTOTOXICITY. (23rd June 2022) - Martinez-Verbo, L.; Llinàs-Arias, P.; Villanueva, L.; García-Prieto, C. A.; Piñeyro, D.; Ferrer, G.; Esteller, M.