Effectiveness of Risk-based Sequential Screening for Esophageal and Gastric Cancer

"1. An epidemiological questionnaire-based risk assessment for UGIC conducted prior to the endoscopic examination;~2. Individuals identified as high-risk receive the upper gastrointestinal endoscopic examination with Lugol's Iodine in the esophagus and indigo carmine staining in the stomach;~3. Individualized reexamination and surveillance strategy will be given to participants diagnosed with premalignant lesions, based on evaluation of risk progression using endoscopic characteristics, pathological diagnosis, and biomarkers."

"1. A questionnaire investigation;~2. All participants undergo the upper gastrointestinal endoscopic examination with Lugol's Iodine in the esophagus and indigo carmine staining in the stomach;~3. Reexamination and surveillance will be performed according to the current guidelines for UGIC screening and clinical treatment."