CD19-CAR–modified TSCM mediate long-lasting antitumor responses. (A) In vivo bioluminescent imaging, (B) radiance, and (C) survival of NSG mice bearing systemic NALM6-GL leukemia xenografts after adoptive transfer of CD19-CAR–modified standard or TSCM-enriched CD8+ T cells (2.5 × 105) in conjunction with intraperitoneal injections of recombinant human IL-15 every other day (****P < .0001; log-rank [Mantel-Cox]; n = 5). Data shown are representative of 2 independent experiments. d, day.