the co‐injection of 3T3 Cxcl14‐OE cells with human EGFR‐mutant LUAD cells exhibited tumour proliferation (Figures 5, 6 and S3J) and drug resistance of gefitinib and osimertinib in vivo (Figures 5K and 6E). The gene discussed is CXCL14; the disease is neoplasm.