© 1989 Oxford University Press
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Gallstone Growth, Size, and Risk of Gallbladder Cancer: An Interracial Study
*Department of Surgery, New York Medical College Valhalla, New York, 10595 USA.
**Department of Epidemiology, Harvard University School of Public Health Boston, Massachusetts, USA.
Department of Pathology, Phoenix Indian Medical Center Phoenix, Arizona, USA.
Department of Pathology, Louisiana State University Medical Center New Orleans, Louisiana, USA.
$Department of Surgery, University of Umeå Umeå, Sweden.
Lowenfels A B (Department of Surgery, New York Medical College, Valhalla, New York 10595, USA), Walker A M, Althaus D P, Townsend G and Domellöf L. Gallstone growth, size and risk of gallbladder cancer: An interracial study. International Journal of Epidemiology 1989, 18: 50–54.
To investigate gallstone size, growth, and the relation between stone size and gallbladder cancer we have used cholecystectomy reports from 1676 female subjects (169 Whites, 531 Blacks, and 976 Native American Indians). Although the prevalence of gallstones differs markedly in these groups it appears that the estimated growth rate of gallstones in younger subjects, 2.0 mm per year (95% confidence interval: 1.7–2.3 mm) is homogeneous for all three groups. In both Indian and non-Indian populations the proportion of small stones diminished and the proportion of large stones increased over time. We found a strong relationship between gallstone size and gallbladder cancer. Large stones (
3 cm) were found in 40% of patients with gallbladder cancer but in only 12% of all subjects of similar age. The relative risk for gallbladder cancer in subjects with stones 3 cm was 9.2 compared with subjects with stones <1 cm. (95% confidence interval: 2.3–37). We estimate that one-third of all gallbladder cancers in subjects with calculi will be associated with large (3 cm) stones. We believe that stone size might be used to determine the risk of gallbladder cancer in patients with gallstones.
Revised 1 July 1988
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