P976: REAL-WORLD OUTCOMES OF PATIENTS WITH PENTA-EXPOSED MULTIPLE MYELOMA WHO WERE TREATED WITH SELINEXOR AND DEXAMETHASONE: KOREAN MULTICENTER RETROSPECTIVE ANALYSIS - Jun Ho Yi; Sung-Soo Park; Chang-Ki Min; Hyeon-Seok Eom; Youngil Koh; Ja Min Byun; Sung-Soo Yoon; Jae Hoon Lee; Sung-Hoon Jung; Je-Jung Lee; Sang Eun Yoon; Kihyun Kim (HemaSphere, 2023)