Without high diagnostic efficacy of endoscopic forceps biopsy (EFB) and with low diagnostic efficacy of narrow band imaging (NBI) in novice endoscopists and endoscopists of community hospitals in China, it is urgent to improve diagnostic efficacy for gastric cancerous lesions.The investigators will conduct a study to develop and validate a diagnostic model based on NBI for early gastric cancerous lesions under endoscopic observation.
Suspected of having a cancerous lesions
The age of patients is from 40-80 years
Patients must undergo esophagogastroduodenoscopy
Clinical diagnosis of advanced gastric cancer
Acute upper gastrointestinal bleeding
Severe systemic diseases
Refuse to attend the study
Shanghai Jiao Tong University School of Medicine
Lead sponsor
Shanghai Putuo District Center Hospital
Collaborator
Shanghai MCC worker hospital
Collaborator