Fig. 5From: Prostanoid receptor genes confer poor prognosis in head and neck squamous cell carcinoma via epigenetic inactivationRisk of recurrence based on gene methylation in tumours of different origins. Odds ratios for recurrence were determined using a Cox proportional hazards model adjusted for age (≥ 65 vs. < 65 years), sex, smoking status, alcohol intake, and tumour stage (I–II vs. III–IV). CI confidence interval. *P < 0.05Back to article page