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  • Stage IB includes: For squamous cell carcinoma: (T1, N0, M0, G2-3, Tumor location: Any); (T2-3, N0, M0, G1, GX, Tumor location: Lower, X). T1: Tumor invades lamina propria, muscularis mucosae, or submucosa. T2: Tumor invades muscularis propria. T3: Tumor invades adventitia. N0: No regional lymph node metastasis. M0: No distant metastasis. G1: Well differentiated. GX: Grade cannot be assessed-stage grouping as G1. G2: Moderately differentiated. G3: Poorly differentiated. Tumor location: Location of the primary cancer site is defined by the position of the upper (proximal) edge of the tumor in the esophagus. For adenocarcinoma: (T1, N0, M0, G3); (T2, N0, M0, G1-2, GX). T1: Tumor invades lamina propria, muscularis mucosae, or submucosa. T2: Tumor invades muscularis propria. N0: No regional lymph node metastasis. M0: No distant metastasis. G1: Well differentiated. G2: Moderately differentiated. G3: Poorly differentiated. GX: Grade cannot be assessed-stage grouping as G1. (AJCC 7th ed.)
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