Oropharyngeal cancer prognosis by tumour HPV status in France: The multicentric Papillophar study

Aims: To evaluate the impact of human papillomavirus (HPV) status, tobacco smoking and initial treatment approach on progression-free survival (PFS) and overall survival (OS) for oropharyngeal cancer (OPC) in France, a country where smoking declines started late (1990s). Methods: 340 OPC patients (median age: 60 years) from 14 French hospitals were followed up (median 26.7 months). PCR-based positivity for both HPV DNA and E6/E7 mRNA was used to distinguish HPVpositive OPC (27.1%). Hospital-stratified hazard ratios (HR) and corresponding 95% confidence intervals (CI) were used to compare PFS and OS according to HPV and other prognostic factors in hospitalstratified unadjusted and multivariate models. The combined effect of HPV status with either smoking, stage, or initial treatment on PFS was also evaluated. Results: PFS in multivariate analysis was better in HPV-positive patients (HR = 0.42; 95% CI: 0.24-0.73) and worse in older patients (HR for 5-year age increase = 1.12) and those having had firstly radiotherapy (HR = 1.86; 95% CI: 1.19-2.92) or induction chemotherapy (HR = 1.73; 95% CI: 1.08-2.79) instead of upfront surgery. Findings for OS were similar. Loco-regional recurrences were less frequent in HPVpositive (10.5%) than HPV-negative patients (26.0%) but distant recurrences were similarly frequent. HPV status did not modify the influence of smoking or stage on PFS but the impossibility to perform upfront surgery may be more relevant for HPV-negative patients.