Clinical and Therapeutic Implications of the 8th Edition TNM Classification of Adenocarcinomas of the Esophagogastric Junction.

The 8th edition of TNM cancer staging is based on data from large patient cohorts, data collected from the Worldwide Collaboration Cancer Esophageal (WECC) group, or the International Association for Gastric Cancer (IGCA), including treated patients surgically per primate or after neoadjuvant treatment. This edition redefines the esophago-gastric junction tumors and recommends different TNMs staging: Siewert type I and II should be classified according to TNM recommendations for esophageal adenocarcinoma, while for Siewert type III the TNM classification for gastric cancer should be considered. Anatomical characteristics feature type T (tumor invasion), type N (regional lymph node invasion) and type M (distant metastasis).