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Despite the success of autologous anti-CD19 CAR T cell therapy in B-Acute lymphoblastic leukaemia (B-ALL) and Diffuse Large B Cell Lymphoma (DLBCL), treatment failures occur. One contributing factor may be the intrinsic T cell fitness of the CAR T cell product that is influenced by the underlying malignancy and prior treatments. With the advent of gene editing, ‘off the shelf’ non-HLA matched healthy donor (HD) CAR T cells are under investigation for the treatment of patients (pts) in clinical trials. UCART19 (S68587) is a first-in-class allogeneic CAR T cell product expressing a second generation anti-CD19 CAR with TALEN®-mediated gene knockouts of T cell receptor alpha chain (TRAC) and CD52 to prevent graft versus host disease and to render them resistant to anti-CD52 antibody used for lymphodepletion. Preliminary clinical trial data on the use of UCART19 in B-ALL was previously reported at ASH …