Belantamab mafodotin in triple-refractory multiple myeloma patients: A retro-prospective observational study in Italy.

Belantamab mafodotin is the first-in-class antibody-drug conjugates targeting B-cell maturation antigen to have demonstrated effectiveness in triple-class refractory multiple myeloma (TCR-MM) patients. We performed a retrospective study including 78 TCR patients, with at least four prior lines of therapy (LOTs), who received belantamab mafodotin within named patient program and expanded access program in Italy between 2020 and 2022. Median age was 65 years (range 42-86 years), ECOG performance status was ≥1 in 45% of patients. Overall, a clinical benefit was obtained in 36 out of 74 evaluable patients (49%), with 43%, 28%, and 13.5% achieving at least partial response, very good partial response, and complete response, respectively. After a median follow-up of 12 months (range 6-21 months), median duration of response, progression-free survival (PFS), and overall survival (OS) were 14, 5.5, and 12 months, respectively. Age >70 years, good performance status and response were associated with longer PFS and OS. Keratopathy occurred in 58% of patients (G3 2.5%), corneal symptoms in 32% (G3 1.2%) and a reduction in visual acuity in 14%. Grade 3 thrombocytopenia occurred in 9% of patients. Only 3% of patients discontinued belantamab mafodotin because of side effects. This real-life study demonstrated significant and durable responses of belantamab in TCR-MM patients with four prior LOTs, otherwise ineligible for novel immunotherapies.

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© 2024 The Authors. eJHaem published by British Society for Haematology and John Wiley & Sons Ltd.

Déclaration de conflit d'intérêts

Francesca Fazio ‐ advisory board: GSK; honoraria: Amgen, Takeda, Janssen‐Cilag, GSK, BeiGENE, and Sanofi Maria Teresa Petrucci ‐ honoraria: Janssen‐Cilag, Celgene‐BMS, Amgen, Sanofi, GSK, and Takeda; advisory boards: Janssen‐Cilag, Celgene‐BMS, Amgen, Sanofi, GSK, Takeda, Roche, Oncopeptides, Pfizer, Menarini, and AbbVie; support for attending meetings and/or travel: Janssen‐Cilag, Celgene‐BMS, Amgen, Sanofi, and Takeda. Laura Corvatta ‐ honoraria: BMS, Janssen, and GSK. Alfonso Piciocchi ‐ no conflicts of interest. Roberta Della Pepa ‐ advisory boards: Amgen, Bristol Myers Squibb, Celgene, GlaxoSmithKline, Janssen, Sanofi, and Takeda. Paola Tacchetti ‐ honoraria: Amgen, Bristol‐Myers Squibb/Celgene, Janssen, Takeda, AbbVie, Sanofi, GlaxoSmithKline, and Pfizer. Maurizio Musso ‐ no COI. Renato Zambello ‐ advisory boards: Roche, Janssen, Bristol Meier Squibb, Sanofi, Amgen, and GSK. Angelo Belotti ‐ advisory boards: Amgen, GSK, Janssen, Takeda, and Pfizer. Sara Bringhen ‐ speakers’ bureaus: Amgen, Bristol Myers Squibb, GlaxoSmithKline, Janssen, Sanofi, and AbbVie; advisory boards: Bristol Myers Squibb, Janssen, Takeda, Pfizer, Stemline Therapeutics, and Oncopeptides; consultancy fees: Sanofi. Elisabetta Antonioli ‐ advisory boards: Janssen‐Cilag, Celgene‐BMS, Amgen, Sanofi, GSK, Takeda, and Pfizer; support for attending meetings and/or travel: Janssen‐Cilag and Sanofi. Concetta Conticello ‐ honoraria: Takeda, Amgen, Janssen, GSK, BMS, and Sanofi. Nicola Di Renzo ‐ honoraria: Janssen, Bristol Myers Squibb, Gilead, Jazz, and AbbVie; advisory boards: Janssen, Bristol Myers Squibb, Jazz, and AbbVie. Valerio De Stefano ‐ advisory boards for: AOP Health, Argenx, Bristol Myers Squibb, Glaxo Smith Kline, Grifols, Novartis, SOBI, and Takeda; speaker fees from Abbvie, Alexion, Amgen, Bristol Myers Squibb, Grifols, Leo Pharma, Novartis, Novo Nordisk, Sanofi, and Takeda; research grant from Alexion. Pellegrino Musto ‐ honoraria: Abbvie, Alexion, Amgen, Astellas, Astra‐Zeneca, Bei‐Gene, Bristol‐Myers Squibb/Celgene, Gilead, Glaxo‐Smith‐Kline, Grifols, Incyte, Janssen, Jazz, Novartis, Pfizer, Roche, Sanofi, Sobi, and Takeda. Barbara Gamberi ‐ honoraria: Amgen, Bristol Myers Squibb, Janssen, and Takeda; advisory boards: Amgen, Bristol Myers Squibb, GlaxoSmithKline, Janssen, Sanofi, and Takeda. Daniele Derudas ‐ no conflicts of interest. Mario Boccadoro ‐ honoraria: Sanofi, Celgene, Amgen, Janssen, Novartis, Bristol Myers Squibb, and AbbVie; advisory boards: Janssen and GlaxoSmithKline; research funding: Sanofi, Celgene, Amgen, Janssen, Novartis, Bristol Myers Squibb, and Mundipharma. Massimo Offidani ‐ honoraria and advisory boards: Amgen, Bristol Myers Squibb, Celgene, GlaxoSmithKline, Janssen, Sanofi, and Takeda. Sonia Morè ‐ honoraria: BMS, Janssen, and GSK.