A dataset retrieved from cBioPortal (http://www.cbioportal.org/public-portal/) revealed no significant correlation between the mRNA expression levels of IGF-1R and Src in adenocarcinoma (ADC; n = 532) and squamous cell carcinoma (SCC; n = 387) (Fig. 1a). This evidence concerns the gene IGF1R and squamous cell carcinoma.