CAR T-cell therapy works by engineering a patient’s T cells to express synthetic receptors that recognize and kill cancer cells without relying on HLA presentation. This approach has shown remarkable success in relapsed or refractory B-cell cancers and multiple myeloma, resulting in several approved treatments. However, no CAR T therapy is currently approved for acute myeloid leukemia (AML) or T-cell acute lymphoblastic leukemia (T-ALL).