title: Meta-analysis of the impact of human papillomavirus (HPV) on cancer risk and overall survival in head and neck squamous cell carcinomas (HNSCC).
abstract: BACKGROUND
  HPV is important in a subset of HNSCC. Our meta-analysis determined the clinical characteristics of HPV-related HNSCC.
  
  
  METHODS
  Pubmed search terms "HPV" and "HNSCC" were used to identify 34 studies since 1980. We obtained pooled adjusted odds ratio (OR) or hazard ratio (HR) using random or fixed-effects model and compared OS depicted in forest plot.
  
  
  RESULTS
  A total of 5681 patients were included. The prevalence of HPV+ tumors was 22%, with 86.7% of HPV16+ genotype. The OR for HNSCC in HPV16+ patients was 4.44 (95% CI = 2.87-6.02). HPV status was associated with p16 expression (adj OR = 3.00; 0.90-9.70), and HPV+ tumors were less likely to harbor p53 mutations (adj OR = 0.21; 0.04-0.38). The HR for death in HPV+ patients was 0.42 (0.27-0.57). HPV+ HNSCC also had a better response to therapy.
  
  
  CONCLUSIONS
  HPV+ HNSCC are established as a separate biologic entity. Prospective trials are needed to establish the optimal therapy for HPV+ HNSCC.
authors.affiliation: Department of Thoracic/Head & Neck Medical Oncology, University of Texas MD Anderson Cancer Center, Houston, TX 77030, USA. fdayyani@mdanderson.org
authors.forename: Farshid
authors.initials: F
authors.lastname: Dayyani
authors.forename: Carol J
authors.initials: CJ
authors.lastname: Etzel
authors.forename: Mei
authors.initials: M
authors.lastname: Liu
authors.forename: Chung-Han
authors.initials: CH
authors.lastname: Ho
authors.forename: Scott M
authors.initials: SM
authors.lastname: Lippman
authors.forename: Anne S
authors.initials: AS
authors.lastname: Tsao
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology / Q000821:virology*; D005260:Female; D006258:Head and Neck Neoplasms / Q000453:epidemiology* / Q000401:mortality / Q000473:pathology / Q000821:virology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D027383:Papillomaviridae / Q000302:isolation & purification*; D030361:Papillomavirus Infections / Q000453:epidemiology* / Q000473:pathology; D012307:Risk Factors; D015996:Survival Rate