Exceptionally Promising Early Readouts for in vivo CAR-T Cells in 2026
Two near-identical lentiviral in vivo BCMA CAR‑T programs produced opposite 2026 outcomes: AstraZeneca/EsoBiotec’s ESO‑T01 showed efficacy but severe early Grade 3+ toxicities and an early halt, while Kelonia’s KLN‑1010 reported 100% ORR with mostly Grade 1-2 CRS at ASCO 2026. This analysis compares vectors, immune reactions, premedication and trial conduct, and explores implications for durability, commercialization and the future of in vivo CAR‑T in multiple myeloma.