ArticleExperimental hematology & oncology2026
Real-world evidence on infection risk in multiple myeloma treated with BiTEs and CAR-T cells: a meta-analysis.
Article in Experimental hematology & oncology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundT-cell-redirecting therapies, including bispecific T-cell engagers (BiTEs) and chimeric antigen receptor T-cell (CAR-T) therapies, have substantially improved outcomes in relapsed or refractory multiple myeloma (RRMM). However, infectious complications remain a major safety concern, particularly in real-world settings, where patients are more heterogeneous than those enrolled in clinical trials.
methodsWe conducted a systematic review and meta-analysis of real-world retrospective studies evaluating severe (grade 3-4) infections in adult patients with RRMM treated with approved BiTEs or CAR-T cell therapies. Pooled event rates were estimated using random-effects models. Heterogeneity was explored through subgroup analyses, meta-regression, and sensitivity analyses.
resultsSixteen studies encompassing 2,097 patients were included. Overall, 24.2% of patients developed grade 3-4 infections (pooled event rate 0.24; 95% CI, 0.21-0.28). Among BiTEs-treated patients (n = 1,602), the pooled severe infection rate was 0.26 (95% CI, 0.23-0.30), with higher rates observed for BCMA-directed BiTEs (0.27) compared with GPRC5D-directed BiTEs (0.25). CAR-T cell therapies (n = 495) were associated with a lower pooled infection rate (0.19; 95% CI, 0.12-0.27).
conclusionsIn real-world practice, severe infections affect approximately one in four patients receiving T-cell-redirecting therapies for RRMM. Observed differences in infection rates across platforms and targets should be interpreted with caution, as they derive from indirect comparisons in non-randomized, heterogeneous cohorts. Nevertheless, these data support incorporating patient frailty and prior infection history into therapeutic decision-making. CAR-T therapy, or GPRC5D-directed BiTEs when CAR-T is not feasible, may represent reasonable options in patients at higher infectious risk, within an individualized and context-dependent treatment strategy.
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