Although the therapeutic landscape for multiple myeloma (MM) has expanded, the disease always tends to relapse. In attempt to obtain deep and durable responses, each relapse requires the use of a new strategy. In recent years, new treatment options have emerged even for heavily treated patients. Novel, well-tolerated and highly effective therapies in the relapsed/refractory (RRMM) setting currently represent a real hope. Belantamab mafodotin (BLENREP™) is a first-in-class monoclonal antibody-drug conjugate (ADC) whose target is B-cell maturation antigen (BCMA) conjugated to the cytotoxic microtubule inhibitor monomethyl auristatin F (MMAF). Here, we present two cases of heavily pre-treated RRMM patients that were favorably treated with Belantamab mafodotin, obtaining at least a partial response. Treatment was well tolerated and is ongoing. This is a rare report on real life clinical use of Belantamab mafodotin outside of controlled clinical trials and provide information on efficacy and safety of this anti-myeloma new class of drugs.

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