[HPV-associated oropharyngeal carcinomas in the 9th edition of the TNM classification - Clinical classification and consequences].

The 9th edition of the TNM classification represents a refinement of the staging system for oropharyngeal carcinoma. Based on the distinction between HPV-associated and HPV-negative tumors introduced with the TNM-8 classification system, TNM-9 aims to capture the prognostically relevant heterogeneity within the HPV-associated subgroup more precisely. In particular, greater emphasis is placed on nodal disease characteristics, including extranodal extension, to improve prognostic discrimination. This CME article reviews the key factors of the TNM-9 classification for HPV-associated oropharyngeal carcinomas and critically discusses their clinical implication. In addition to formal aspects of staging, diagnostic work-up, the role of imaging, the significance of p16 immunohistochemistry as a surrogate marker, and the impact of smoking and comorbidity are addressed. Cervical carcinoma of unknown primary and nasopharyngeal carcinoma are highlighted as paradigmatic models of biologically integrated staging. The aim of this article is to clarify the prognostic role of TNM-9 while outlining its limitations. Appropriate application requires standardized diagnostic procedures and interdisciplinary interpretation; therapeutic decisions should not be derived from TNM stage alone.