Poseida Therapeutics reports data from Phase 1 trial of P-BCMA-ALLO1

Poseida Therapeutics announced new interim clinical data from its ongoing Phase 1 trial of P-BCMA-ALLO1 in patients with relapsed/refractory multiple myeloma. Data demonstrated a 91% overall response rate and compelling safety results in the 23 heavily pretreated patients in Arm C, an optimized lymphodepletion arm. The new clinical data were presented today in an oral session at the 21st International Myeloma Society Annual Meeting in Rio de Janeiro. “The compelling and differentiated results from the optimized lymphodepletion arms of the ongoing Phase 1 trial of P-BCMA-ALLO1 showed deep responses and a high response rate in patients with heavily pre-treated relapsed or refractory multiple myeloma, regardless of prior exposure to B-cell maturation antigen-targeting therapy. The high overall response rate of 91% is remarkable because most study participants in my center had rapidly proliferative refractory disease, in contrast with those treated in the pivotal clinical trials of FDA-approved autologous CAR-T therapies. Such patients treated in the current trial of P-BCMA ALLO1 would not have qualified for standard of care autologous CAR T therapy,” said Bhagirathbhai Dholaria, M.D., Associate Professor of Medicine, Malignant Hematology & Stem Cell Transplantation at Vanderbilt University Medical Center in Nashville, Tenn., and trial investigator. “All patients in the Phase 1 trial have been treated quickly once enrolled, with no waiting for manufacturing, with no need for apheresis or bridging therapy, demonstrating key advantages of allogeneic CAR-T cell therapy.”