The genotype frequencies of polymorphisms in the <i>PTEN</i>, <i>AKT1</i> and <i>p53</i> genes in patients with nasopharyngeal carcinoma and controls.

NOTE: The number of samples that were genotyped varies due to genotyping failure for some individuals. Abbreviations: OR, odds ratio; CI, confidence interval; NA, not applicable. aORs and P values were adjusted for age, sex, smoking and drinking status, smoking level and nationality.