To evaluate the efficacy and safety profile of endoscopic submucosal tunnel dissection for superficial esophageal squamous cell carcinoma.

This multicenter, prospective, randomized, controlled study aims to evaluate the efficacy and safety of the tunnel technique in ESD of superficial esophageal squamous cell carcinoma (ESCC). Specifically the tunnel technique would be compared to conventional method on the procedure time and the muscular layer injury rate in patients scheduled for ESD with indication of ESCC.

Inclusion Criteria:

• ≥18 years;
• Biopsy confirmed early esophageal cancer and high-grade intraepithelial neoplasia (HGIN)which were eligible for conventional ESD indications;
• Suspected localized mucosal lesions detected by endoscopy.

Exclusion Criteria:

• Malignancy or other advanced disease with a life expectancy of < 6 months as judged by the investigator.
• The ASA classification of physical status ≥ 4 as judged by the investigator.
• Severe hepatic disease or renal disease
• Ability to understand and the willingness to sign a written informed consent document.
• Major cardiovascular event at enrollment or within 3 months prior to enrollment such as stroke, myocardial infarction, or hospitalization for treatment of unstable angina pectoris as judged by the investigator.
• Haemorrhagic disorder.
• Patients who had a history of esophagectomy or a recurrent lesion.
• Planned treatment with: warfarin (including other vitamin K antagonists), cisapride,phenytoin, atazanavir, nelfinavir, digoxin, methotrexate, clopidogrel, tacrolimus,theophylline, lidocaine, nifedipine.
• Pregnancy, planned pregnancy or lactation. Women of childbearing potential must use reliable and medically accepted methods of birth control, as judged by the investigator.
• Known or suspected alcohol, drug or medication abuse.
• Any condition associated with poor compliance as judged by the investigator.
• Participation in any study involving administration of an investigational product or device within the preceding 14 days prior to enrollment.
• Involvement in the planning and conduct of the study. Previous enrollment in the present study

The operator only understands the operation method required by the patient and is unaware of the observation indicators