TGFB1 and non-small cell lung carcinoma: Epithelial-mesenchymal transformation (EMT) serves an important function in the metastasis progress of lung cancer cells, and the occurrence of EMT is related to a variety of cytokines, transcription factors, and signal transduction pathways, among which the EMT mediated by TGF-β exerts a pivotal role in metastasis and invasion of NSCLC [7, 8].