The results of the study appear in this month's Cancer Epidemiology, Biomarkers and Prevention journal. Andrew Flood, Ph.D., epidemiologist with the University of Minnesota Cancer Center and School of Public Health, led the study in collaboration with the National Cancer Institute (NCI).
The study involved 45,354 women in the United States who did not have a history of colorectal cancer. The women were categorized into groups according to information they provided about their diets and lifestyles. The women averaged 61.9 years of age upon entering the study and they were followed in the study for an average of 8.5 years. This study began in 1987 and closed in 1997. During that time, 482 women in the study developed colorectal cancer.
"It is especially notable that the risk reduction was present regardless of the source of the calcium, and that simultaneously consuming high levels of calcium from both diet and supplements further reduced risk," Flood said. "These observations suggest that it was the calcium per se, and not merely dairy products or some other variable that accounted for the reduction in risk."
The findings provide further evidence in a growing body of research that indicates a link between calcium and prevention of colorectal cancer. This study is good news for women because they comprise about half of the approximately 150,000 people in the United States diagnosed annually with colorectal cancer. The cancer ranks as the second leading cause of
Contact: Mary Lawson
University of Minnesota