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Stage IIB includes: (T1, N1, M0); (T2, N1, M0); (T3, N1, M0). T1: Tumor limited to ampulla of Vater or sphincter of Oddi. T2: Tumor invades the duodenal wall. T3: Tumor invades the pancreas. N1: Regional lymph node metastasis. M0: No distant metastasis. (from AJCC 7th Ed.)
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