Correlation Between the Efficacy of Neoadjuvant Chemotherapy Combined With Immunotherapy of Operable Thoracic Esophageal Squamous Cell Carcinoma and the Metabolites of Intestinal Flora

Exclusion Criteria

• •1. Refuse to participate;
• •2. Patients who have a higher risk of bleeding or perforation due to the tumor's obvious invasion of the adjacent organs (aorta or trachea) of the esophageal lesion, or patients who have formed a fistula;
• •3. Have previously received anti-PD-1, anti-PD-L1, anti-PD-L2, anti-CD137 or anti-CTLA-4 antibody therapy, or any other antibodies targeting T cell costimulation or checkpoint pathways as specific targets or drug;
• •4. Participate in another interventional clinical study at the same time, unless participating in an observational (non-interventional) clinical study or in the follow-up phase of an interventional study;
• •5. Have received systemic systemic treatment with anti-tumor indications Chinese herbal medicine or immunomodulatory drugs (including thymosin, interferon, interleukin, etc.) within 2 weeks before the first administration;
• •6. Have used immunosuppressive drugs within 1 week before enrollment, excluding nasal spray, inhalation or other local glucocorticoids or physiological doses of systemic glucocorticoids (ie no more than 10mg/day prednisone Or equivalent doses of other glucocorticoids), or use hormones to prevent allergy to contrast agents.