title: Study of the concordance between p16 immunohistochemistry and HPV-PCR genotyping for the viral diagnosis of oropharyngeal squamous cell carcinoma.
abstract: OBJECTIVE
  The diagnosis of HPV-related oropharyngeal cancer in clinical practice is based on p16 immunohistochemistry and PCR detection of viral DNA (HPV-PCR). The primary objective of this study was to evaluate the concordance between these 2 diagnostic tests. The secondary objective was to study the clinical characteristics of these patients.
  
  
  METHODS
  This single-centre prospective study was conducted between February 2010 and July 2012. Immunohistochemical analysis of p16 and HPV-PCR were performed on tumour biopsies. Concordance was evaluated according to Cohen's kappa coefficient and was interpreted according to the Landis and Koch scale. The patients' clinical data were analysed as a function of the diagnostic test results.
  
  
  RESULTS
  Seventy-one patients were included in this study. The prevalence of HPV was 43.7% according to p16 and 31% according to HPV-PCR. The concordance study revealed a kappa coefficient of 0.615. A tumour of the tonsil or base of the tongue was detected in 100% of p16+/HPV-PCR+ cases. Smoking and alcohol abuse were significantly less frequent among HPV+ patients regardless of the method of detection. These patients were older and presented tumours with a lower grade of histological differentiation.
  
  
  CONCLUSIONS
  p16 immunohistochemistry or HPV-PCR used alone appear to be insufficient. These results confirm the high prevalence of HPV-related oropharyngeal squamous cell carcinoma (OSCC) and the previously reported specific clinical and histological features, apart from age. It appears essential for future clinical trials to be stratified according to smoking and tumour HPV status, defined by means of reliable virological tests targeting E6/E7 mRNA and no longer a simple positive response to the p16 marker, as is frequently the case at the present time. New tests suitable for use in routine practice therefore need to be developed.
authors: Service d'oto-rhino-laryngologie, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France.
authors: D
authors: D
authors: Fonmarty
authors: Service d'oto-rhino-laryngologie, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France.
authors: S
authors: S
authors: Cherrière
authors: Laboratoire de virologie, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France.
authors: H
authors: H
authors: Fleury
authors: Laboratoire d'anatomie-pathologique, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France.
authors: S
authors: S
authors: Eimer
authors: Service de chirurgie maxillo-faciale, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France.
authors: C
authors: C
authors: Majoufre-Lefebvre
authors: Service d'oto-rhino-laryngologie, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France.
authors: V
authors: V
authors: Castetbon
authors: Service d'oto-rhino-laryngologie, CHU de Bordeaux, Hôpital Pellegrin, place Amélie-Raba-Léon, 33056 Bordeaux cedex, France. Electronic address: erwan.de-mones-del-pujol@chu-bordeaux.fr.
authors: E
authors: E
authors: de Monès
mesh_terms: D014408:Biomarkers, Tumor / Q000235:genetics*; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis* / Q000453:epidemiology / Q000821:virology; D019941:Cyclin-Dependent Kinase Inhibitor p16; D004279:DNA, Viral / Q000032:analysis; D005260:Female; D005602:France / Q000453:epidemiology; D005838:Genotype; D061809:Human Papillomavirus DNA Tests; D052162:Human papillomavirus 16 / Q000235:genetics* / Q000472:pathogenicity; D006801:Humans; D007150:Immunohistochemistry / Q000379:methods; D008297:Male; D008875:Middle Aged; D060787:Neoplasm Grading; D009363:Neoplasm Proteins / Q000235:genetics*; D009367:Neoplasm Staging; D009959:Oropharyngeal Neoplasms / Q000175:diagnosis* / Q000453:epidemiology / Q000821:virology; D030361:Papillomavirus Infections / Q000150:complications / Q000175:diagnosis* / Q000453:epidemiology / Q000821:virology; D016133:Polymerase Chain Reaction; D011237:Predictive Value of Tests; D015995:Prevalence; D011379:Prognosis; D011446:Prospective Studies; D015203:Reproducibility of Results; D012307:Risk Factors; D012680:Sensitivity and Specificity
chemical_list: D014408:Biomarkers, Tumor; C000614131:CDKN2A protein, human; D019941:Cyclin-Dependent Kinase Inhibitor p16; D004279:DNA, Viral; D009363:Neoplasm Proteins
keywords: HPV; Oropharyngeal cancer; P16; PCR