ReviewFrontiers in immunology2026
From CAR-T to CAAR-T: redefining targeting strategies in B-cell malignancies through idiotype-directed cellular therapy.
Review in Frontiers in immunology, 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
Chimeric antigen receptor T-cell (CAR-T) therapy has transformed the management of selected hematologic malignancies, particularly relapsed or refractory large B-cell lymphoma, B-cell acute lymphoblastic leukemia, and multiple myeloma. However, currently approved CAR-T strategies largely rely on lineage-associated or differentiation antigens, such as CD19 or BCMA, and therefore do not selectively distinguish malignant B cells from their normal counterparts. This limitation contributes to on-target, off-tumor toxicity, including B-cell aplasia, hypogammaglobulinemia, infectious complications, and prolonged immune dysfunction. In addition, CAR-T therapy remains associated with cytokine release syndrome, immune effector cell-associated neurotoxicity syndrome, immune effector cell-associated hematotoxicity, manufacturing complexity, and variable efficacy across disease entities, particularly in chronic lymphocytic leukemia. Chimeric autoantibody receptor T-cell (CAAR-T) therapy represents a conceptually distinct approach in which engineered T cells are designed to recognize disease-defining immunoglobulin structures, including surface immunoglobulin or B-cell receptor idiotypes. This strategy has been most extensively explored in autoimmune diseases, where CAAR-T cells can selectively eliminate autoreactive B-cell populations while sparing the broader B-cell compartment. Its application in B-cell malignancies remains largely hypothetical, but the biological principle is attractive because many B-cell neoplasms are defined by clonotypic immunoglobulin rearrangements. In this review, we provide a disease-specific and translationally oriented assessment of idiotype-directed CAAR-T therapy in B-cell malignancies. We summarize the current evidence supporting CAAR-T biology, critically evaluate its potential in chronic lymphocytic leukemia, indolent lymphomas, multiple myeloma, and minimal residual disease, and discuss key biological, economic, manufacturing, and regulatory barriers. At present, CAAR-T should not be viewed as a near-term replacement for approved CAR-T therapies, but rather as a hypothesis-generating precision platform requiring rigorous disease-specific validation.
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