Current surgical treatment of esophagogastric junction adenocarcinoma

Table 1 Different classification of esophagogastric junction cancer

System	Classification	Description
Siewert classification	Type I	1-5 cm above the EGJ
	Type II	Within 1 cm above and 2 cm below the EGJ
	Type III	2-5 cm below the EGJ
AJCC/UICC TNM	Esophageal adenocarcinomas	Within 2 cm proximal or distal to the EGJ
	Gastric cancer	More than 2 cm distal from the EGJ
Japanese classification	-	A tumor (≤ 4 cm diameter) with an epicenter locating within 2 cm of the EGJ, whether adenocarcinoma or squamous cell carcinoma

EGJ: Esophagogastric junction; AJCC: American Joint Committee on Cancer; UICC: Union for International Cancer Control.