CSF2 and neoplasm: However, after 48 h of co‐culturing lymphocytes from TDLN and KPC tumor cells in vitro with different effector‐to‐target (ET) ratios, the highest cytotoxic effect at the ET 1 ratio was generated by lymphocytes from the C‐REV‐GM‐CSF with 2′3′‐cGAMP combination therapy on day 6 (Fig. 5M).