P920: EFFECTIVENESS AND SAFETY OF SELINEXOR-BASED REGIMEN IN THE TREATMENT OF RELAPSED AND REFRACTORY MULTIPLE MYELOMA: A MULTICENTER REAL-WORLD STUDY FROM CHINA. (23rd June 2022) - Kuang, L.; Fang, B.; Chen, W.; Liu, A.; Li, C.; Bao, L.; Fu, C.; Chen, J.; Li, H.; Pang, Y.; Liao, A.; Liang, Y.; et al.