S229: PROPHYLACTIC EFFICACY OF INTRATHECAL VERSUS INTRAVENOUS METHOTREXATE FOR CNS RELAPSE IN HIGH-RISK DIFFUSE LARGE B CELL LYMPHOMA: A PHASE III RANDOMIZED, CONTROLLED STUDY - Seung-Ah Yahng; Ho-Young Yhim; Jae-Yong Kwak; Ho-Jin Shin; Joon Ho Moon; Hyeon-Seok Eom; Ka-Won Kang; Yong Park; Min Kyoung Kim; Se Ryun Lee; Dae Sik Kim; Hyo Jung Kim; et al. (HemaSphere, 2023)