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Cancer | Calcium, Vitamin D Prevent Colon Cancer Recurrence Together

Calcium and Vitamin D Act Together to Prevent Colon Cancer Recurrence

Calcium prevents recurrence of colon cancer more effectively in people with higher levels of vitamin D than in people with lower levels, reports a new study published in the Journal of the National Cancer Institute (2003;95:1765–71).

Vitamin D is a fat-soluble vitamin produced in skin exposed to sunlight and activated in the liver and kidney. It is also obtained through the consumption of foods such as fortified dairy foods, eggs, and fish. Vitamin D increases the intestinal absorption of calcium, and decreases its output in the urine, leaving more calcium available to the bones and possibly other tissues of the body. The results of some animal and human studies have suggested that vitamin D might protect against colon and other cancers, but other studies have found no such effect. A number of studies have demonstrated that high intake of calcium reduces the risk of colon cancer. There is some evidence that vitamin D and calcium might have a synergistic cancer-preventive effect in the colon, but the interactions between these two nutrients in the colon are not well understood.

The current study examined the effect of calcium supplementation and vitamin D levels on the risk of recurrence of colon cancer. The 803 participants had all had colon cancer in the past, but had no detectable cancer at the beginning of the study. Participants were randomly assigned to receive either 1,200 mg of calcium per day or a placebo. They were monitored for recurrence of colon cancer over a four-year period. Vitamin D levels in the blood were measured at the beginning and end of the study and a median vitamin D level was calculated. The risk of recurrence of colon cancer was evaluated separately for those whose vitamin D levels were at or below the median and for those whose levels were above the median.

In people with higher vitamin D levels, those receiving calcium had a significantly lower risk of recurrence than those receiving placebo, but in those with lower vitamin D levels, calcium showed no significant protective effect. Similarly, in people taking calcium, those with higher vitamin D levels had a significantly lower risk of recurrence than those with lower vitamin D levels, but in people receiving placebo, vitamin D levels had no significant effect on risk.

The results of this study suggest that calcium supplementation and higher vitamin D levels together, but not independently, protect against recurrence of colon cancer. Future studies are needed to evaluate the joint effect of calcium and vitamin D on colon cancer risk in people who have never had colon cancer. The effect of vitamin D supplementation and optimal levels of calcium and vitamin D intake remain to be determined.

Maureen Williams, ND, received her bachelor’s degree from the University of Pennsylvania and her Doctorate of Naturopathic Medicine from Bastyr University in Seattle, WA. She has a private practice in Quechee, Vermont, and does extensive work with traditional herbal medicine in Guatemala and Honduras. Dr. Williams is a regular contributor to Healthnotes Newswire.

Copyright © 2004 Healthnotes, Inc. All rights reserved. Republication or redistribution of the Healthnotes® content is expressly prohibited without the prior written consent of Healthnotes, Inc. Healthnotes Newswire is for educational or informational purposes only, and is not intended to diagnose or provide treatment for any condition. If you have any concerns about your own health, you should always consult with a healthcare professional. Healthnotes, Inc. shall not be liable for any errors or delays in the content, or for any actions taken in reliance thereon. Healthnotes and the Healthnotes logo are registered trademarks of Healthnotes, Inc.

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The health information contained in this site is not intended as medical advice and should not be considered a substitute for appropriate medical care. Any products mentioned in studies cited in Healthnotes articles are not necessarily endorsed by Bastyr. As with any product, consult with a natural health practitioner to discuss what may be best for you.

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