Study on Adjuvant Chemotherapy After Total Two-field Lymph Node Dissection of Thoracic Esophageal Squamous Cell Carcinoma

Inclusion Criteria: 1. Patients with esophageal squamous cell carcinoma who received radical surgical resection and total two-field lymph node dissection did not receive neoadjuvant therapy before surgery, and didn't suffer serious complications after surgery. 2. T≥3 or N≥1, and more than 15 lymph nodes were dissected. 3. Age ≥18 years and ≤75 years. 4. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1. 5. Adequate hematological function: absolute neutrophil count (ANC) ≥ 1.5×109/L, and blood platelet count (PLT) ≥ 1.5×109/L, and hemoglobin ≥ 9g/dL. 6. Adequate hepatic function: total bilirubin ≤1.5 times the upper limit of normal (ULN), aspartate aminotransferase, alanine aminotransferase, and alkaline phosphatase ≤2.5 × ULN. 7. Adequate renal function: serum creatinine ≤1.5 × ULN and creatinine clearance ≥50 ml/min. 8. Subjects could understand and comply with study and follow-up procedures, and voluntarily signed written informed consent Exclusion Criteria: 1. Suffering from previous primary malignancy or co-existing serious illness of other organs, which will affect the judgment of the end point of this study. 2. Serious postoperative complications that will affect progress of chemotherapy. 3. Patients with chemotherapy contraindications. 4. Women who are pregnant or breast-feeding or who are planning for pregnancy. 5. Unable to complete the follow-up as planned. 6. Without informed consent due to psychological, family, social and other factors.