Association Between Screen-detected Gallstone Disease and Cancer in a Cohort Study.Shabanzadeh DM, Sørensen LT, Jørgensen T.Gastroenterology. 2017 Feb 23. pii: S0016-5085(17)30177-4.

BACKGROUND & AIMS:Knowledge of temporal associations between screen-detected gallstone disease and specific cancers is limited. The objective of this study was to determine if screen-detected gallstones or cholecystectomy is associated with occurrence of gastrointestinal and non-gastrointestinal cancers.

METHODS:We performed a cohort study of 3 randomly selected groups from the general population of Copenhagen. Participants (n=5928) were examined from 1982 through 1992 and underwent abdominal ultrasound examination to detect gallstone disease, but were not informed of their gallstone status. Participants were followed for the occurrence of cancers through national registers until December 2014. We performed multivariable Cox regression analyses to identify factors associated with development of cancer.RESULTS:Gallstone disease was identified in 10% of participants (591/5928); of these, 6.8% had gallstones and 3.2% had cholecystectomy at baseline. The population was followed for median 24.7 years (interquartile range, 18.9-32.4 years) with 1% lost. Pooled gastrointestinal cancers were associated with gallstone disease (11.2% of patients with gallstone disease vs 6.64% without; hazard ratio [HR], 1.50; 95% CI, 1.12-2.01). Right-side colon cancer was also associated with gallstone disease (2.57% of patients with gallstone disease vs 0.96% without; HR, 2.04; 95% CI, 1.10-3.78). Pancreatic, esophageal, gastric, pooled colorectal, left-side colon, sigmoid colon, and rectal cancers were not associated with gallstone disease. Breast cancer had a weak association with gallstone disease depending on other factors (10.6% of patients with gallstone disease vs 7.41% without; HR, 1.44; 95% CI, 0.99-2.11). Pooled non-gastrointestinal and prostate cancers were not associated with gallstone disease.CONCLUSIONS:Screen-detected gallstone disease in the general population is associated with pooled gastrointestinal and right-side colon cancers. These associations are not due to detection bias or cholecystectomy. Further studies are needed to determine the mechanism of this association.

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