P939: SYNERGISTIC EFFECTS OF LOW DOSE BELANTAMAB MAFODOTIN IN COMBINATION WITH A GAMMA-SECRETASE INHIBITOR (NIROGACESTAT) IN PATIENTS WITH RELAPSED/REFRACTORY MULTIPLE MYELOMA (RRMM): DREAMM-5 STUDY. (23rd June 2022) - Nooka, A.; Lonial, S.; Grosicki, S.; Hus, M.; Song, K.; Facon, T.; Callander, N. S.; Ribrag, V.; Uttervall, K.; Quach, H.; Vorobyev, V.; Min, C.-K.; et al.