P865: BIOMARKER ANALYSIS TO SUPPORT DOSE OPTIMIZATION OF IBERDOMIDE AS MONOTHERAPY AND IN COMBINATION WITH STANDARD OF CARE TREATMENTS FOR MULTIPLE MYELOMA FROM A PHASE 1/2 TRIAL. (23rd June 2022) - Amatangelo, M.; Cheng, Y.; Pierceall, W.; van de Donk, N. W.; Lonial, S.; Wang, M.; Emerson, J.; Hong, K.; Maciag, P.; Peluso, T.; Gandhi, A.; Thakurta, A.