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Stage I includes: T1, N0, M0. T1: Stomach: tumor invades lamina propria or submucosa and is 1 cm or less in size; duodenum /jejunum/ileum: tumor invades lamina propria or submucosa and is 1 cm or less in size; ampulla: tumor 1 cm or less; colon or rectum: tumor invades lamina propria or submucosa and is 2 cm or less. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 7th ed.)
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