摘要目的:探讨胃癌群体性筛查联合机会性筛查的新模式对胃癌诊治的价值。方法:利用群体性筛查联合机会性筛查进行胃癌普查。（1）群体性筛查：采用整群抽样法，2017年7月—2020年12月对威海市农村居民中的高危人群（年龄40~<70岁）进行内镜普查，必要时进行活检并送组织病理学检查。主要采集指标：进展期胃癌、早期胃癌、高级别上皮内瘤变（high grade intraepithelial neoplasia，HGIN）的检出率。（2）机会性筛查：同步观察2017年7月—2020年12月威海市两家区县级医院机会性筛查早期胃癌检出率的变化。结果:（1）群体性筛查：2017年7月—2020年12月，首批完成8 000例胃癌筛查。进展期胃癌、早期胃癌、HGIN分别检出36、28、62例，胃癌总例数为64例，胃癌检出率、早期胃癌检出占比分别为0.80%（64/8 000）、43.75%（28/64）。早期胃癌+HGIN患者接受内镜黏膜下剥离术治疗者占77.78%（70/90），治愈性切除率100.00%（70/70）。（2）机会性筛查：2017年7月—2020年12月，文登区中西医结合医院机会性筛查中每年早期胃癌检出占比分别16.67%（1/6）、20.00%（3/15）、23.53%（4/17）、33.33%（6/18），乳山市人民医院机会性筛查中每年早期胃癌检出占比分别14.74%（14/95）、23.80%（60/252）、25.49%（65/255）、24.04%（50/208）。威海市医院机会性筛查早期胃癌检出占比呈逐年上升趋势。结论:在胃癌高发区，一定规模的群体性筛查可进一步带动更广泛的机会性筛查，从而提高早期胃癌检出率，该胃癌诊治新模式值得推广。

abstractsObjective:To evaluate the new model of group screening combined with opportunistic screening for the diagnosis and treatment of gastric cancer.Methods:Group screening combined with opportunistic screening was used for gastric cancer screening. (1) Group screening. Cluster sampling was used to screen gastric cancer by endoscopy in high-risk population (aged 40-<70 years) of rural residents in Weihai from July 2017 to December 2020, and biopsy was obtained for histopathology if necessary. Main collection parameters included the detection rate of advanced gastric cancer, early gastric cancer and high-grade intraepithelial neoplasia (HGIN). (2) Opportunistic screening. The changes of the detection rates of early gastric cancer in opportunistic screening in 2 hospitals in Weihai area were observed during the same period of time.Results:(1) In group screening, from July 2017 to December 2020, the first batch of 8 000 cases of gastric cancer screening were completed. The cases of advanced gastric cancer, early gastric cancer and HGIN were 36, 28, and 62, respectively. The detection rates of gastric cancer and early gastric cancer were 0.80% (64/8 000) and 43.75% (28/64), respectively. The proportion of early gastric cancer+HGIN who received endoscopic submucosal dissection (ESD) was 77.78% (70/90), and the rate of curative resection was 100.00%(70/70). (2) Opportunistic screening: from July 2017 to December 2020, the annual early gastric cancer detection rates in opportunistic screening in Wendeng District Traditional Chinese and Western Medicine Hospital were 16.67% (1/6), 20.00% (3/15), 23.53% (4/17), and 33.33% (6/18) in the consecutive 4 years, respectively. The annual detection rates of early gastric cancer in opportunistic screening in Ru Shan Peoples Hospital were 14.74% (14/95), 23.80% (60/252), 25.49% (65/255), and 24.04% (50/208), respectively. The detection rates of opportunistic screening for early gastric cancer in hospitals in Weihai city increased year by year.Conclusion:In areas with high incidence of gastric cancer, a certain scale of group screening can lead to a wider range of opportunistic screening, resulting in the increase of the detection rate of early gastric cancer. The new model of diagnosis and treatment of gastric cancer is worth recommendation.