Since the study was grouped according to the 7th edition of the TNM classification, the recommendation of PET-CT surveillance after primary radiochemotherapy is currently given for all initially node-positive (N+) tumours in view of the possible underestimation in N1-categorized p16-positive oropharyngeal carcinomas in the 8th edition. The gene discussed is CDKN2A; the disease is oropharyngeal carcinoma.