The factors that independently increased the risk of OS shortening included diagnosis of squamous cell carcinoma (HR = 2.10, 95% CI: 1.04–4.28, p = 0.0406) and GG genotype of the BIRC5 gene (HR = 3.63, 95% CI: 2.05–6.43, p < 0.0001). The gene discussed is BIRC5; the disease is squamous cell carcinoma.