Benoit Tessoulin

Summary Very scarce data exist about outcomes of relapsed multiple myeloma patients who have failed proteasome inhibitor, immunomodulatory drug, anti‐CD38 monoclonal antibody and therapies targeting B‐cell maturation antigen (BCMA) (Quad‐class exposed [QCE]). In this retrospective single‐centre study, we determined progression‐free survival (PFS) and overall survival (OS) from anti‐BCMA failure in 45 QCE patients. Seven (16%) patients received antibody‐drug conjugate, 20 (44%) bispecific antibodies and 18 (40%) CAR‐T cell. Thirty patients (67%) received ≥1 subsequent line of treatment. PFS was 4.4 months (95% CI = 2.4–12.5) and OS 6.3 months (95% CI = 3.9–14.4). Having an adverse prognosis, QCE myeloma patients remain an unmet medical need.