Prognostic role of human papilloma virus status in hypopharyngeal squamous cell carcinoma

Objective: Although the prognostic role of human papilloma virus (HPV) status in oropharyngeal head and neck squamous cell carcinoma (SCC) is well established, growing evidence shows that there may be a prognostic role for HPV status in hypopharyngeal SCC. The objective of this study was to determine the prognostic role of HPV status in hypopharyngeal SCC. Methods: We performed a retrospective, population-based analysis of 1934 adult patients with HNSCC diagnosed between 2010-2016 and treated with a combination of surgery and/or radiotherapy, with or without chemotherapy, and a subset of 641 patients with hypopharyngeal SCC and known HPV status included in the Surveillance, Epidemiology, and End Results (SEER) Head and Neck with HPV Status Database. Patient data were used to determine the adjusted 2-year cancer-specific survival (CSS) and overall survival (OS) for the entire cohort and the specific subgroup of hypopharyngeal cancer patients with known HPV status. Results: Of the 1934 hypopharynx SCC cases, HPV status was unknown in 1294 (66.9%), and 167 (8.6%) were HPV positive; among hypopharynx cases with known HPV status, 21.6% were HPV positive. In models adjusting for sex, age, race/ethnicity, marital status and stage, patients with HPV-positive hypopharyngeal tumors had improved CSS compared with patients with HPV-negative tumors (CSS: HR: .57, 95% CI = .38 to .86,P= .008; OS: HR: .49, 95% CI = .34 to .71,P= <.001). Conclusion: Our findings in a large cohort of hypopharyngeal SCC with known HPV status and cancer-specific survival support the hypothesis that HPV has a prognostic role in hypopharyngeal cancer. Consideration should be given to increased testing for HPV in hypopharyngeal SCC. Level of Evidence:4