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Kaplan‐Meier curves of tumor location (superior/inferior mediastinum) on disease‐free survival (DFS) outcomes in thymoma. The mean DFS in superior and inferior mediastinum of thymoma were (149.3 ± 24.5) months and (330.4 ± 13.5) months. The differences of DFS between two groups were significant (P < 0.001). Of the 176 patients, the DFS was (308.1 ± 13.9) months.
