As blocking IL15‐stat5a axis significantly dampened the Sell(hi) neutrophil‐mediated tumor cell killing capacity of p‐Stat5+ Tpex, we next assessed whether blocking this axis also reduced the antitumor efficacy of the C‐P regimen in MOC2 tumor‐bearing mice in vivo (Figure S7a, Supporting Information). Here, IL15 is linked to neoplasm.