International Myeloma Working Group immunotherapy committee consensus guidelines and recommendations for optimal use of T-cell-engaging bispecific antibodies in multiple myeloma.

Multiple myeloma remains an incurable disease, despite the development of numerous drug classes and combinations that have contributed to improved overall survival. Immunotherapies directed against cancer cell-surface antigens, such as chimeric antigen receptor (CAR) T-cell therapy and T-cell-redirecting bispecific antibodies, have recently received regulatory approvals and shown unprecedented efficacy. However, these immunotherapies have unique mechanisms of action and toxicities that are different to previous treatments for myeloma, so experiences from clinical trials and early access programmes are essential for providing specific recommendations for management of patients, especially as these agents become available across many parts of the world. Here, we provide expert consensus clinical practice guidelines for the use of bispecific antibodies for the treatment of myeloma. The International Myeloma Working Group is also involved in the collection of prospective real-time data of patients treated with such immunotherapies, with the aim of learning continuously and adapting clinical practices to optimise the management of patients receiving immunotherapies.

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Declaration of interests PR-O reports personal fees derived from consulting or advisory board roles from Celgene-BMS, Janssen, Roche, AbbVie, Pfizer, GSK, Sanofi, and H3Biomedicine; steering committee membership from Celgene-BMS, Regeneron, and Janssen; speaker's bureau fess from Janssen, Celgene-BMS, GSK, Sanofi, and AbbVie; and a travel grant from Pfizer. SU reports grants and personal fees from AbbVie, Amgen, BMS, EdoPharma, Genentech, Gilead, GSK, Merck, Sanofi, and Seagen; speakers’ bureau fees, consulting and advisory board participation, and steering committee membership from Janssen; participation on advisory boards from Karyopharm Therapeutics, Oncopeptides, Secura Bio, SkylineDx, and Takeda; and grants from Moderna, TeneoBio, and Pharmacyclics, outside the submitted work. ADC reports personal fees and participation on advisory boards from GSK; personal fees from Bristol Myers Squibb, Janssen, AbbVie, Pfizer, iTeos, Ichnos, Arcellx, and Legend; personal fees and participation on advisory boards from Genentech/Roche; participation on advisory boards from Novartis, outside the submitted work; and has a patent licensed for Novartis. NWCJvdD reports personal fees from Janssen Pharmaceuticals, Amgen, Celgene, Novartis, Cellectis, Bristol Myers Squibb/Celgene, Sanofi, Takeda, Roche, Novartis, Bayer, Adaptive, Pfizer, AbbVie, and Servier, outside the submitted work. JGP-L reports personal fees from Janssen and GSK, outside the submitted work. MVM reports personal fees from Janssen, Celgene/Bristol Myers Squibb, Novartis, GSK, Sanofi, Amgen, Pfizer, AbbVie, and Regeneron, outside the submitted work. HE reports personal fees and research support from Bristol Myers Squibb/Celgene, Janssen, Sanofi, and GSK; and personal fees from Amgen, Takeda, and Novartis; outside the submitted work. MM reports personal fees from Janssen, Bristol Myers Squibb, WebMD global, GSK, and CDR-Life; and research funding from Siemens and BeiGene; outside the submitted work. BAD reports advisory board participation and consulting fees from COTA and Janssen; personal fees from Multiple Myeloma Research Foundation; honoraria for CME-related activities from Plexus Communications; research funding from Amgen and GSK; and involvement as an independent reviewer of a clinical trial for BMS; outside the submitted work. NP reports research funding and accomodation expenses from Amgen, Bristol Myers Squibb, Janssen, Takeda, and The Binding Site; research funding from Sanofi, and personal fees from Pfizer, outside the submitted work. PJH reports personal fees from Antengene, Gilead, iTeos Therapeutics, Janssen, Novartis, and Pfizer, outside the submitted work. W-JC reports personal fees from AbbVie, Amgen, Pfizer, Sanofi, Regeneron, GSK, and Novartis; and grants and personal fees from Bristol Myers Squibb, Janssen, and Novartis, outside the submitted work. GG reports personal fees from and is a shareholder of XNK Therapeutics Sweden, and personal fees from Fujimoto Pharmaceutical corporation, outside the submitted work. FS reports personal fees from AbbVie, GSK, Celgene, Takeda, Janssen, Oncopeptides, Sanofi, BMS, Novartis, SkyliteDX, Pfizer, and Daiki-Sankyo, outside the submitted work. JCY reports personal fees from Janssen, Sanofi, BMS, Regeneron, GSK, Pfizer, Menarini, outside the submitted work. EZ reports personal fees from Janssen, Bristol Myers Squibb, Amgen, and Takeda, outside the submitted work. RP reports personal fees and travel support from GSK and Janssen; and personal fees from Pfizer, AbbVie, Bristol Myers Squibb, and Sanofi, outside the submitted work. CN reports personal fees and participation on advisory boards from Janssen; personal fees from Bristol Myers Squibb, Sanofi, GSK, Pfizer, AstraZeneca, and DKSH; and personal fees and participation on advisory boards from Amgen, outside the submitted work. YL reports grants and personal fees from Janssen; personal fees from Sanofi, NexImmune, Caribou, Bristol Myers Squibb, Regeneron, and Genentech; and personal fees and participation on data safety monitoring boards from Pfizer, outside the submitted work. AC reports personal fees from AbbVie, Adaptive, Amgen, Antengene, Bristol Myers Squibb, Forus, Genetech/Roche, GSK, Janssen, Karyopharm, Millenium/Takeda, and Sanofi/Genzyme, outside the submitted work. JM reports personal fees from Amgen, Sanofi, Bristol Myers Squibb, Janssen, and Takeda, outside the submitted work. MC reports personal fees from Janssen, Celgene/Bristol Myers Squibb, GSK, Sanofi, Amgen, Menarini-Stemline, AbbVie, and Pfizer, outside the submitted work. All other authors declare no competing interests.