P1217: INTRATHECAL METHOTREXATE PROPHYLAXIS AND CENTRAL NERVOUS SYSTEM RELAPSE IN PATIENTS WITH DIFFUSE LARGE B-CELL LYMPHOMA TREATED WITH INTENSIFIED R-ACVBP STRATEGY. (23rd June 2022) - Renaud, L.; Stéphan, P.; durand, S.; Escure, G.; Franck, M.; camus, V.; tilly, H.; casasnovas, O.; Chevret, S.; Thieblemont, C.