FGF22 and lung carcinoma: Supporting this finding, correlation analysis of gene expression data of a TCGA cohort of KRAS‐mutant lung cancer patients (n = 141) revealed that the mRNA level of PLK1 is significantly negatively correlated with that of FGFR pathway genes, in particular strongly correlated (Spearman's ρ > 0.3) with FGFR2, FGFR3, and several FGFs (e.g., FGF14, FGF22), the cognate ligands of FGFR and triggers of FGFR‐mediated signaling (Appendix Fig S3A).