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Stage IIA includes: (T1, N1, M0); (T2, N0, M0). T1: Tumor invading the bile duct wall with a depth less than 5 mm. T2: Tumor invading the bile duct wall with a depth of 5-12 mm. N0: No regional lymph node metastasis. N1: Metastasis in one to three regional lymph nodes. M0: No distant metastasis. (AJCC 8th ed.)
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