CCL19 and neoplasm: CAR‐T cells in this model, it is not necessarily due to the presence of IL‐7 and/or CCL19 since 7 × 19 CAR‐T cells could produce a comparable or even higher IFN‐γ when 7 × 19 CAR‐T cells generated from a different donor were co‐cultured with a different tumor (data not shown).