Results 198 patients were diagnosed by endoscopy and biopsy, including 20 gastric cancer, 22 gastric precancerosis, 156 gastrelcoma and chronic superficial gastritis.

• 结果20例经病理检查诊断为胃癌的患者中，16例可检测到肿瘤特征峰，符合率为80.；0%25；