Inclusion Criteria:  confirmed pathological esophageal squamous cell carcinoma ≥18 years old the Eastern Cooperative Oncology Group Performance Status (ECOG PS) 0-1 no previous anti-tumor treatment no esophageal bleeding or fistula adequate hemocyte count, normal hepatic and renal functions Esophageal obstruction classified as grade 2 or grade 3 according to CTCAE 5.0  Exclusion Criteria:  lactating or pregnant women known hypersensitivity or allergy to any kind green tea extract placement of small intestinal feeding tube or endoscopic stent treatment