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4% (95% CI 79.2-85.6%), respectively. The 5- and 10-year overall survival (OS) rates were 96% (95% CI 95.1-96.9%) and 92.7% (95% CI 91.1-94.3%), respectively. Multivariate analysis revealed that the risk factors for recurrence were an age of ≥ 70 years, T2 or larger tumors, clinically detected lymph node metastasis, histological tumor diameter of 1 cm, histologically detected lymph node metastasis (≥ n2), and the implementation of preoperative treatment. The 5-year recurrence rate under the standard treatment was estimated to be 1