IL17A and cancer: In the KEGG functional enrichment analysis, the main targets were osteoclast differentiation, IL‐17 signalling pathway, T cell receptor signalling pathway, programed cell death 1 expression and programed cell death ligand‐1checkpoint pathway in cancer, Th17 cell differentiation, Th1 and Th2 cell differentiation, C‐type lectin receptor signalling pathway and tumour necrosis factor(TNF)signalling pathway.