一、背景长期以来,日本学者和西方学者对消化道上皮肿瘤的分类和命名、特别是癌瘤侵袭前病变的分类和命名存在着不同的看法和使用不同的术语。这种差异在我国更集中地反映出来,形成了诊断和命名上很大的紊乱。在日本,胃癌是消化道最常见的恶性肿瘤,对此癌及其前驱病变进行了深 First, the background For a long time, Japanese scholars and Western scholars on the classification and naming of gastrointestinal epithelial tumors, especially the classification and nomenclature of lesions before cancer invasion have different views and use different terms. This disparity is reflected more centrally in our country, creating a major disorder in diagnosis and nomenclature. In Japan, gastric cancer is the most common malignant tumor of the digestive tract, and this cancer and its precursor lesions were deep