P929: CIRCULATING TUMOR DNA ASSESSMENT IMPROVES PROGNOSTIC PREDICTION IN RELAPSED/REFRACTORY MULTIPLE MYELOMA RECEIVING IXAZOMIB, LENALIDOMIDE, AND DEXAMETHASONE - Yasunori Kogure; Hiroshi Handa; Yuta Ito; Masaki Ri; Yuichi Horigome; Masaki Iino; Yoriko Harazaki; Takahiro Kobayashi; Masahiro Abe; Tadao Ishida; Shigeki Ito; Hiromi Iwasaki; et al. (HemaSphere, 2023)