P1420: PRE-CLINICAL PROOF OF CONCEPT DEMONSTRATES ROBUST ACTIVITY OF UCART20X22 DUAL CAR T-CELLS FOR THE TREATMENT OF B-CELL MALIGNANCIES. (23rd June 2022) - Aranda Orgilles, B.; Chion-Sotinel, I.; Grudman, S.; Mumford, B.; Dixon, C.; Duchateau, P.; Galetto, R.; Gouble, A.; Poirot, L.