Second primary lung cancer after head and neck squamous cell cancer: Population-based study of risk factors

Background Patients with head and neck squamous cell cancer (HNSCC) are at risk of developing second primary lung cancer (SPLC). Methods Among 61,883 patients with HNSCC from the Surveillance, Epidemiology and End Results (SEER) database, 4522 developed SPLC (any histology) =2 months after HNSCC. We correlated risk with demographic and tumor-related parameters. Results The risk of SPLC after HNSCC was 5.8%, 11.4%, and 16.4% at 5, 10, and 15 years, respectively. From Cox regression, significantly adverse (p < .0001) risk factors for SPLC included: regional versus localized HNSCC stage (hazard ratio [HR] = 1.16), hypopharyngeal or supraglottic laryngeal site (HR = 1.57), increased age (HR = 1.26/decade), black race (HR = 1.27), and male sex (HR = 1.26). Glottic (HR = 0.75) and tonsillar or oral cavity sites (HR = 0.80) were associated with significantly (p < .0001) lower risks of SPLC. Conclusion From population-based actuarial analyses, HNSCCs with more aggressive clinicopathologic features were more apt to develop SPLC, suggestive of similar environmental and/or host factors for these cancers. (c) 2012 Wiley Periodicals, Inc. Head Neck, 2012