PB2019: EFFICACY AND SAFETY OF IXAZOMIB PLUS LENALIDOMIDE AND DEXAMETHASONE FOLLOWING INJECTABLE PROTEASOME INHIBITOR-BASED THERAPY IN PATIENTS WITH RELAPSED/REFRACTORY MULTIPLE MYELOMA. (23rd June 2022) - Sasaki, M.; Suzuki, K.; Abe, Y.; Ito, S.; Nishiwaki, K.; Handa, H.; Chou, T.; Soeda, J.; Mori, I.; Shinozaki, T.; Takezako, N.