PD-1 Antibody Combined With mXELIRI Versus mXELIRI in the Second-line Setting for ESCC

Inclusion criteria

• ✓. Voluntarily participate and sign the informed consent form
• ✓. Age≥ 18 years old, gender is not limited
• ✓. Estimated survival time≥ 3 months
• ✓. Physical status ECOG status score of 0 or 1
• ✓. metastatic esophageal squamous cell carcinoma, including patients with postoperative recurrence and metastasis that cannot be operated or are not suitable for radical radiotherapy, first-line chemotherapy combined with PD-1 antibody therapy is unsuccessful or intolerable (first-line chemotherapy does not use fluorouracils and irinotecan)
• ✓. If metastatic esophageal cancer has serious clinical symptoms due to lesions, palliative radiotherapy is required first, and radiotherapy is required to be completed for more than 4 weeks (radiotherapy lesions include but are not limited to primary lesions, bones, and lymph nodes)
• ✓. Bone marrow hematopoietic function: hemoglobin ≥ 9.0g/dL, white blood cell ≥ 4.0×109/L, neutrophil ≥ 1.5×109/L, platelet ≥ 90×109/L
• ✓. Liver and kidney function: total bilirubin ≤ 1.5 × ULN, creatinine ≤ 1.0 × ULN, AST/ALT ≤ 2.5 ULN, ALP 5.0 ULN, creatinine clearance ≥ 60mL/min, subjects with liver metastases: AST/ALT ≤5.0 ULN

Exclusion criteria