CEACAM5 and neoplasm: In Chi's group, they confirmed that combination use of CEA CAR‐T cells and recombinant human IL-12 (the dose of IL-12 were 1, 10, 50, 100, 200, 500, and 1000 U/mL, respectively) significantly enhanced anti-tumor efficacy in vivo, showed improved T cell efficacy and increased level of serum cytokines than CEA CAR‐T cells alone.