This is also supported by the KEGG database analysis (https://www.kegg.jp/), in which growth factors such as EGF, TGF, and HGF promote the expression of CCND1 through Ras–MEK–ERK axis in non-small cell lung cancer (NSCLC) (Supplementary Figure 1). Here, CCND1 is linked to non-small cell lung carcinoma.