Gastric cancer screening in selected population of Moscow region: retrospective evaluation

Abstract

The aim of the study was to evaluate the efficacy of photofluorographic gastric cancer screening in selected population of Moscow Region (Russia) during a 15-year period. Thirty-five thousand patients were examined annually with photofluorography (tight filling and double contrast) of the stomach. Gastroscopy with multiple biopsies was performed in suspicious or inconclusive cases. Dynamic CT scan with air distention of the stomach was made before the operation for precise determination of tumor size as well as in some inconclusive cases. The final diagnosis was made by histologic examination of resected stomach. A total of 4286 patients dropped out of the study. In 25,392 patients no pathology was found. Gastric cancer was diagnosed in 680 (1.94%) of patients. In the study 170 (25%) "early" gastric cancers and 510 (75%) advanced gastric cancers were found. Among 170 early gastric cancers 120 (70%) were type-IIb (flat carcinoma) lesions in which endoscopy had low positive predictive value due to nonspecific picture and negative biopsy. On the contrary, dynamic CT scan with air distention of the stomach revealed local thickening of stomach wall in 118 of 120 (98.3%) of the tumors and correctly determined their sizes in 106 of 120 (89.9%). Gastric cancer screening by means of photofluorography in selected groups of patients is efficient and cost-effective. In doubtful cases with negative biopsies and nonspecific endoscopic image, dynamic CT scan with air distention of the stomach can be a method of choice.

Duration of lead time in screening for gastric cancer

“…The number of these prevalence cases equals the annual incidence of the disease in the same population multiplied by the lead time in years, and therefore, its duration may be derived from the prevalence/incidence ratios (23). The prevalence/incidence ratios of GCs detected by mass screening (Table 1) suggest a lead time of 3.4 (24), 1.9 (25) and 4.3 (26) years in Japan, 1.9 -2.3 years in Russia (27), and 1.8 -4.0 years in Korea (28,29).…”