P1299: OUTCOMES OF YOUNG ADULTS (AGED ≤40 YEARS) WITH NEWLY DIAGNOSED MULTIPLE MYELOMA AFTER UPFRONT AUTOLOGOUS STEM CELL TRANSPLANT - Oren Pasvolsky; Curtis Marcoux; Denái R. Milton; Adeel Masood; Mark R. Tanner; Qaiser Bashir; Samer Srour; Neeraj Saini; Jeremy L. Ramdial; Yago Nieto; Hans C. Lee; Krina K. Patel; et al. (HemaSphere, 2023)