CEACAM5 and neoplasm: The experimental results showed that there was no significant change in T‐cell numbers when co‐cultured with CEA‐negative BxPC‐3 cells under the four treatment conditions whereas T‐cell number after co‐cultured with CEA‐positive tumor cells significantly increased under CEA‐CAR‐T treatment or CEA‐CAR‐T cells and rhIL‐12 treatment.