In cell-based antiproliferation studies, alrizomadlin demonstrated selective activity against WT TP53 MM cell lines, including MOLP-8, H929, and MM1S...In vivo studies showed that coadministration of alrizomadlin with proteasome inhibitor bortezomib or carfilzomib enhanced tumor regression (vs. single agents) in H929 xenograft models...the combination of MDM2 inhibitor APG-115 and proteasome inhibitors have synergistic antitumor effects on MM tumors harboring WT TP53.