UPDATED RESULTS OF THE PHASE I BALLI-01 TRIAL OF UCART22, AN ANTI-CD22 ALLOGENEIC CAR-T CELL PRODUCT, IN PATIENTS WITH RELAPSED OR REFRACTORY (R/R) CD22+ B-CELL ACUTE LYMPHOBLASTIC LEUKEMIA (B-ALL) (EHA 2023)
The fludarabine, cyclophosphamide, and alemtuzumab (FCA) LD regimen was well tolerated and associated with extended host lymphocyte suppression and UCART22 expansion (Jain N, et al...Pts received a median of 4 (2-8) prior Tx, including blinatumomab (blin,12 pts, 63%), inotuzumab (ino,10 pts, 53%), autologous CD19 CAR T-cell (CAR19, 8 pts, 42%), and prior HSCT (8 pts, 42%)...For FCA-DL3, 3/6 pts (50%) responded: 1 pt who failed 4 prior lines, including multiagent chemotherapy, blin, ino, CAR19, and allo HSCT, achieved an MRD neg CR lasting over 100 days after UCART22 infusion; 1 pt who failed 4 prior lines, including multiagent chemotherapy, venetoclax (ven), CAR19, and allo HSCT, achieved an MRD negative CRi consolidated with DLI after D90; and 1 pt who failed 3 prior lines, including multiagent chemotherapy, ven, CAR19, and allo HSCT, achieved an MRD negative MLFS up to D114... UCART22 continues to be safe and tolerable, with no Tx-related serious TEAEs or DLTs reported. In the FCA-DL3 cohort, 50% of pts responded. UCART22 cells were detected in patients in the FCA arm and associated with clinical activity.