Adjuvant Hypofractionation Radiotherapy for Thymic Epithelial Tumours After Complete Resection

Inclusion Criteria: * Thymoma and Thymic carcinoma confirmed by histology or cytology * R0 resection (complete resection) * stage II and III thymic carcinoma，stage III thymoma，stage IIB B2/B3 thymomas. * Karnofsky performance status(KPS) 80, 90 or 100. * Having sufficient Pulmonary function, renal function and liver function. Neutrophile granulocyte count\>1.5×109 /L, platelet count\>80×109 /L, hemoglobin ≥10g/dL. Exclusion Criteria: * Prior thoracic radiotherapy. * Uncontrolled Comorbidities. * Pregnant or nursing mother. * Pneumonia