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Stage III includes: IIIA (T2a/b, N2, M0); (T3, N1, M0); (T4, N0, M0). IIIB: (T3, N2, M0). N0: No regional lymph node metastasis. N1: Metastasis in 1 to 6 regional lymph nodes. N2: Metastasis in 7 to 15 regional lymph nodes. T2a: Tumor invades muscularis propria. T2b: Tumor invades subserosa. T3: Tumor penetrates serosa (visceral peritoneum) without invasion of adjacent structures. T4: Tumor invades adjacent structures. M0: No distant metastasis. (AJCC 6th ed.)
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