Signature gene analysis of IFN‐Mac_CXCL9 revealed 108 significantly up‐regulated genes in tumour‐infiltrating cells including HLA‐A, HLA‐DRB1 and interferon‐regulated genes (CXCL9, CXCL10 and IL4I1) (Figures 3B and S7A and Table S4). Here, IL4I1 is linked to neoplasm.