CCL18 and neoplasm: The results indicated that DCs in multi‐primary tumours exhibit high expression of major histocompatibility complex (MHC) class II molecules (HLA‐DRB6, HLA‐DPB1, HLA‐DQB1 and HLA‐DQA2), as well as certain chemokines and inflammatory factors (CXCR4, CXCL8, CXCL2, CXCL16, CCL4, CCL3L1, CCL3, CCL18 and CCL17; Figure S5A and Table S9).