title: The synchronous prevalence of colorectal neoplasms in patients with stomach cancer.
abstract: OBJECTIVE
  The association between stomach cancer and colorectal cancer is controversial. The purpose of this study was to determine the synchronous prevalence of colorectal neoplasms in patients with stomach cancer.
  
  
  METHODS
  A total of 123 patients with stomach cancer (86 male) and 246 consecutive, age- and sex-matched persons without stomach cancer were analyzed from July 2005 to June 2010. All of them underwent colonoscopy within 6 months after undergoing gastroscopy.
  
  
  RESULTS
  The prevalence of colorectal neoplasms was significantly higher in the stomach cancer group (35.8%) than in the control group (17.9%) (P < 0.001). Colorectal neoplasms were more prevalent in the patients with stomach cancer (odds ratio [OR], 3.10; 95% confidence interval [CI], 1.71 to 5.63). In particular, the difference in the prevalence of colorectal neoplasms was more prominent in the patients above 50 years old (OR, 3.54; 95% CI, 1.80 to 6.98).
  
  
  CONCLUSIONS
  The results showed that the synchronous prevalence of colorectal neoplasms was higher in patients with stomach cancer than in those without stomach cancer. Therefore, patients with stomach cancer should be regarded as a high-risk group for colorectal neoplasms, and colonoscopy should be recommended for screening.
authors: Department of Internal Medicine and Institute of Health Science, Gyeongsang National University School of Medicine, Jinju, Korea.
authors: Sang Su
authors: SS
authors: Lee
authors: Woon Tae
authors: WT
authors: Jung
authors: Cha Young
authors: CY
authors: Kim
authors: Chang Yoon
authors: CY
authors: Ha
authors: Hyun Ju
authors: HJ
authors: Min
authors: Hyun Jin
authors: HJ
authors: Kim
authors: Tae Hyo
authors: TH
authors: Kim