We analyzed c-MET protein and gene expression in HNSCC cells highly sensitivity to irradiation, e.g., FaDu and Cal33, in comparison to SAS and UT-SCC-5 with a lower sensitivity and found a significant positive correlation to tumor radiosensitivity that was illustrated by tumor control doses 50% (TCD50) values [45] (Figure 2A,B). This evidence concerns the gene MET and head and neck squamous cell carcinoma.