Real-world Experience of ICIs Plus Chemotherapy for Advanced ESCC.

Inclusion Criteria: Age \> 18, had an Eastern Cooperative Oncology Group performance status score of 0-3; Patients had unresectable or recurrent disease that precluded esophagectomy or definitive chemoradiation, or distant metastatic disease; Patients had received no previous systemic therapy (patients who had progressed ≥6 months after \[neo\]adjuvant therapy or definitive chemoradiation were eligible); Patients accepted at least one cycle of anti-PD-1 immunotherapy as 1st line treatment, combined chemotherapy was allowed. Patients who provided informed consent by appropriate methods. In dead case, optout will be applicable. Exclusion Criteria: Patients who are prior exposure to immune-mediated therapy.