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Stage IIIB includes: T4, N0, M0. T4: Tumor with invasion into any of the following: aorta (ascending, arch, or descending), arch vessels, intrapericardial pulmonary artery, myocardium, trachea, esophagus. N0: No regional lymph node metastasis. M0: No distant metastasis. (AJCC 8th ed.)
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