ATM and head and neck squamous cell carcinoma: The role of miRNAs in HNSCC radioresistance phenomena has been demonstrated for a group of miR-16, miR-29b, miR-1254, and miR-150 up-regulated miRNAs and the down-regulated let-7e miRNA for the situation where radiosensitivity is not mediated by ATM gene [79,81,89].