Conflict-of-interest disclosure:A.C. reports research support from Janssen and consulting for AbbVie, Adaptive, Amgen, Antengene, Bristol Myers Squibb, FORUS, Genentech Roche, GlaxoSmithKline, Janssen, Karyopharm, Millennium Takeda, and Sanofi Genzyme. H.J.C. reports employment with the Multiple Myeloma Research Foundation and research support from GenentechRoche, Bristol Myers Squibb, and Takeda, unrelated to this project. L.J.S. reports consulting and advisory board roles for Janssen. C.R. reports research support from Amgen, Janssen, Bristol Myers Squibb, and Teneobio; consulting for Amgen, Janssen, Bristol Myers Squibb, Karyopharm, Sanofi, and Artiva; speakers bureau roles for Bristol Myers Squibb; and scientific advisory board roles for Bristol Myers Squibb, Janssen, Sanofi, and Artiva. A.C.R. reports consulting for Johnson & Johnson, Bristol Myers Squibb, Karyopharm, Adaptive, and Sanofi. S.R. reports honoraria received from Janssen and Bristol Myers Squibb; steering committee roles with Gracell Therapeutics and Bristol Myers Squibb; research support from Janssen, Bristol Myers Squibb, C4 Therapeutics, Gracell Therapeutics, and Heidelberg Pharma; and advisory board roles for Genentech and Janssen. S.P. reports research support from Bristol Myers Squibb, Grail, and Caribou; and advisory board roles for Grail. S.J. reports consulting for Janssen, Bristol Myers Squibb, Caribou, Legend Biotech, Regeneron, Takeda, Sanofi, and Poseida; advisory board and data monitoring committee roles for Genmab, Sanofi, and Janssen; and advisory board roles for GlaxoSmithKline and Bristol Myers Squibb. The remaining authors declare no competing financial interests.