TP53 and head and neck squamous cell carcinoma: The purpose of our study was to investigate the effects of p73 G4C14-to-A4T14 polymorphism and three p53-SNPs in exon 4 and introns 3 and 6, as well as their combination and their interaction with lifestyle habits, in association with SCCHN risk and progression within a hospital-based case-control study in an Italian population.