0年来食管和贲门癌的发病率增长较其它癌肿为快。1987年Siewert提出贲门癌的一种新分类法，并被国际胃癌学会研讨会接受。该分类法依据肿瘤的定位和解剖学特点，包括位于冒食管交接处5cm以内的所有肿瘤（肿瘤较大的以其中心计算）。Ⅰ型是位于胃食管交接处1cm以上的远端食管癌 In the past 0 years, the incidence of esophageal and cardiac cancers has increased faster than other cancers. In 1987, Siewert proposed a new classification of cardia cancer and was accepted by the International Association for Gastric Cancer. The classification is based on the location and anatomy of the tumor, including all tumors within 5 cm of the esophageal junction (larger tumors are calculated at their centers). Type I is distal esophageal cancer more than 1 cm above the junction of gastroesophageal junctions