As we expected, the flow cytometric results showed that Ly6Chigh monocytes and neutrophils markedly infiltrated in tumour tissues of oxPAPC‐treated WT mice, while there was no significant change in oxPAPC‐treated CCL2−/− mouse or LTB4R−/− mice compared with that in their respective control mice (Figure 5A,B). This evidence concerns the gene LTB4R and neoplasm.