title: Effectiveness of gastric cancer screening programs in South Korea: organized vs opportunistic models.
abstract: OBJECTIVE
  To investigate the outcome and effectiveness of two screening programs, National Cancer Screening Program (NCSP) and opportunistic screening (OS), for the detection of gastric cancer.
  
  
  METHODS
  A total of 45  654 subjects underwent upper endoscopy as part of the NCSP or OS at the Chung-Ang University Healthcare System in Korea between January 2007 and December 2010. The study population was comprised of subjects over the age of 40 years. More specifically, subjects who took part in the NCSP were Medicaid recipients and beneficiaries of the National Health Insurance Corporation. Still photographs from the endoscopies diagnosed as gastric cancer were reviewed by two experienced endoscopists.
  
  
  RESULTS
  The mean age of the screened subjects was 55 years for men and 54 years for women. A total of 126 cases (0.28%) of gastric cancer were detected from both screening programs; 100 cases (0.3%) from NCSP and in 26 cases (0.2%) from OS. The proportion of early gastric cancer (EGC) detected in NCSP was higher than that in OS (74.0% vs 53.8%, P = 0.046). Among the 34  416 screenees in NCSP, 6585 (19.1%) underwent upper endoscopy every other year as scheduled. Among the 11  238 screenees in OS, 3050 (27.1%) underwent upper endoscopy at least once every two years during the study period. The detection rate of gastric cancer was found to be significantly higher during irregular follow-up than during regular follow-up in both screening programs (0.3% vs 0.2%, P = 0.036). A higher incidence of EGC than advanced gastric cancer was observed during regular follow-up compared with irregular follow-up.
  
  
  CONCLUSIONS
  Compliance to the screening program is more important than the type of screening system used.
authors: Department of Internal Medicine, Chung-Ang University College of Medicine, Heukseok-dong, Dongjak-gu, Seoul 156-755, South Korea.
authors: Beom Jin
authors: BJ
authors: Kim
authors: Chae
authors: C
authors: Heo
authors: Byoung Kwon
authors: BK
authors: Kim
authors: Jae Yeol
authors: JY
authors: Kim
authors: Jae Gyu
authors: JG
authors: Kim
mesh_terms: D000328:Adult; D000368:Aged; D016009:Chi-Square Distribution; D055088:Early Detection of Cancer; D005260:Female; D005773:Gastroscopy; D019983:Guideline Adherence; D006801:Humans; D015994:Incidence; D008297:Male; D008403:Mass Screening / Q000379:methods / Q000458:organization & administration*; D008875:Middle Aged; D017146:Models, Organizational; D010349:Patient Compliance; D017410:Practice Guidelines as Topic; D011237:Predictive Value of Tests; D056910:Republic of Korea / Q000453:epidemiology; D013274:Stomach Neoplasms / Q000175:diagnosis* / Q000453:epidemiology; D013997:Time Factors
keywords: Early gastric cancer; Gastric cancer; National Cancer Screening Program; Opportunistic screening