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Stage IIIB includes: T4, N0, M0. T4: Tumor invading the main portal vein or its branches bilaterally, or the common hepatic artery; or unilateral second-order biliary radicals with contralateral portal vein or hepatic artery involvement. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.)
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