This prospective clinical observational study aims to construct a metabolite database specifically for gastric cancer patients using metabolomics technology. It seeks to develop and validate metabolic biomarkers for early diagnosis, prognosis, and prediction of recurrence and metastasis in gastric cancer, thereby a establishing safe, convenient, and highly sensitive method for early screening and prognostic prediction.
**Healthy Controls:**
Age > 18 years;
Signed informed consent and willingness to participate in the project.
Age ≥ 18 years;
**Healthy Controls:**
Individuals at high risk for hereditary colorectal adenocarcinoma, including family members of the following diseases: family history of gastrointestinal tumors, familial adenomatous polyposis (FAP), hereditary nonpolyposis colorectal cancer (HNPCC/LS), and Peutz-Jeghers syndrome (P-J syndrome);
History of chronic metabolic or inflammatory diseases that are difficult to control, such as hypertension, diabetes, chronic viral hepatitis, and inflammatory bowel disease;
Known history of other malignancies that have progressed or required treatment within the past 5 years, except for skin basal cell carcinoma and squamous cell carcinoma that have been cured;