P978: IXAZOMIB VERSUS LENALIDOMIDE OR IXAZOMIB AND LENALIDOMIDE COMBINATION AS MAINTENANCE REGIMEN FOR PATIENTS WITH MULTIPLE MYELOMA: INTERIM ANALYSIS OF A MULTI-CENTER PROSPECTIVE STUDY IN CHINA. (23rd June 2022) - Zhuang, Z.; Tian, Y.; Yu, H.; Shi, L.; Tian, W.-W.; Liu, Q.; Zou, D.; Dong, F.; Ma, Y.; Feng, R.; Liu, S.; Liu, H.; et al.