We next verified the protein levels of the integrin α‐subunits suggested to be differentially represented between samples at the mRNA level, including ITGA2, ITGA3, ITGA4, ITGA6, ITGA11, and ITGAV using 10 paired (tumour and adjacent) ESCC patient tissues. This evidence concerns the gene ITGA2 and esophageal squamous cell carcinoma.