CD19 and acute lymphoblastic leukemia: In a recent report at the 2018 ASH Annual Meeting, 6 patients with R/R B-ALL after allo-HSCT (5 sibling matched, 1 haplo-identical) were enrolled to receive donor-derived CAR T cells containing CD19 ScFv (HI-19 clone) and a 4-1BB-CD3ζ signaling domain.