Tis inculdes cancer cells confined within the glandular basement membrane( intraepithelial) or lamina propria(intra-mucosal) with no extension through the muscularis mucosae into the submucosa.

• 肿瘤细胞局限在腺体基底膜(上皮内癌)或固有层(粘膜内)；没有超过粘膜肌层侵及至粘膜下层.