ERCC2 and head and neck squamous cell carcinoma: Subsequent analysis pertaining to the assessment of risks associated with individual mutant genotypes with regards to SCCHN risk depicted statistically significant association for rs13181 (ERCC2) homozygous mutant (CC) (OR 1.680, 95% CI 1.014 to 2.784), heterozygous (AC) (OR 1.531, 95% CI 1.092 to 2.149) and combined mutant (AC + CC) (OR 1.560, 95% CI 1.128 to 2.158) genotypes.