In order to analyze the tumor‐promoting effect of tumor‐associated neutrophil‐polarized IL‐17A‐producing Th subsets in vivo, we co‐cultured NTCS‐conditioned neutrophils (NCN) with CD4+ T cells, or TTCS‐conditioned neutrophils (TCN) with CD4+ T cells for 4 days and then injected them into the human NOD/SCID model mice bearing SGC‐7901‐derived tumor, then sequentially injected IL‐17A blocking antibody or control IgG every 2 days until the mice were sacrificed. The gene discussed is IL17A; the disease is neoplasm.