Prospective Gastric Cancer Screening With Fecal Multi-target DNA Analysis

Inclusion Criteria: 1. Age ≥40 years, male or female. 2. No contraindications to endoscopy and able to cooperate with endoscopy. 3. Patients must be able to fully understand the informed consent form and be able to sign the informed consent form in person. Exclusion Criteria: 1. A history of diagnosed gastric cancer or other malignant tumors of the digestive tract. 2. Comorbid severe underlying conditions (e.g., severe cardiopulmonary insufficiency, liver or renal failure, etc.) that are likely to result in a short life expectancy or render long-term follow-up impractical. 3. Severe mental illness or incapacity to participate in the study due to lack of civil behavior. 4. Pregnant or breastfeeding women. 5. Other conditions that the investigator deems inappropriate for participation in the study.