DDR1 and non-small cell lung carcinoma: The 14-gene EMT classifier was used in our previous study [19] to define the EMT states of NSCLC tumors, including three mesenchymal markers (ZEB1, VIM, and FN1) and 11 epithelial markers (CDH1, EPCAM, ESRP1, ESRP2, DDR1, CTNNB1, CD24, CLDN7, KRT8, KRT19, and RAB25).