Follow-up
tumor
EVENT, METASTASIS, TUMOR
All patients were interviewed by telephone from discharge to February 1st, 2021. Disease-free survival (DFS) was selected for assessing patients’ prognoses. DFS was defined as the period between surgery to the event that first recorded tumor relapse or metastasis. The patients with follow-up time longer than 1 year, or who had an event within 1 year were divided into the 1-year cohort. The patients with follow-up time longer than 5 years, or who had an event within 5 years were divided into the 5-year cohort.