Pathologic Markers in Surgically Treated HPV-Associated Oropharyngeal Cancer: Retrospective Study, Systematic Review, and Meta-analysis

Abstract

Objective: Human papillomavirus–associated (HPV) oropharyngeal cancer is a unique clinical entity whose incidence is increasing. It is controversial whether traditional pathologic markers of aggressive head and neck cancer also apply in surgically treated HPV-associated disease. Study Design: Retrospective study, systematic review, and meta-analysis Data Sources: PubMed and Cochrane review. Review Methods: PubMed and Cochrane review were searched for published articles on surgically treated HPV-associated oropharyngeal cancer. Eligible studies were included in a meta-analysis of survival using several clinicopathologic markers as predictors. Surgically treated HPV-positive oropharyngeal cancer patients at our institution were studied retrospectively and added to the meta-analysis. Results: Eight published reports, plus our retrospective series, were included in the meta-analysis. This showed significant impact on event-free survival for T stage, nodal number, perineural invasion, and lymphovascular invasion (all P < .05) but not for N stage extracapsular extension ( P = ns). Conclusions: While many traditional clinico-pathologic markers of aggressive disease in head and neck cancer also impact survival in surgically treated HPV-associated oropharyngeal cancer, extracapsular extension may be less important.