Similarly, quercetin -- a member of a group of plant-derived polyphenolic anti-oxidant substances known as flavanoids (found in a variety of foods including onions, green tea and red wine) -- has been shown to inhibit growth of colon cancer cell lines in humans and abnormal colorectal cells in rodents.

Although these substances were administered together, due to relative dose levels it is Giardiello's belief that curcumin is the key agent.

"The amount of quercetin we administered was similar to what many people consume daily; however, the amount of curcumin is many times what a person might ingest in a typical diet, since turmeric only contains on average 3 percent to 5 percent curcumin by weight," says Giardiello. Because of this, he cautions that simply consuming curry and onions may not have the same effect as was produced in this study.

In the trial, five patients were selected from the Cleveland Clinic in Weston Fla. All patients had previously had their colons surgically removed. Four of the five patients retained the rectums, whereas the remaining patient had both colon and rectum removed and part of the small intestine adapted to serve as colon and rectum. All patients had five or more adenomas in their lower intestinal tract. None of the patients had taken NSAIDS for more than one week during the three months leading up to the study.

Participants were examined using a flexible sigmoidoscope before treatment was initiated and at three month intervals (range three to nine months) during treatment. Number and size of polyps were examined at each visit.

Each patient received 480 milligrams of curcumin and 20 milligrams of quercetin orally three times a day for six months and was told not to use NSAIDs for the duration of the study. Three patients followed treatment as prescribed. One patient did not follow the scheduled treatment doses between months three and six and was continued on therapy until the ninth month. A second patient dropped out of the study after the third month.

A decrease in polyp number was observed in four of the five patients at three months and four of the four patients at six months.

Side effects were minimal. One patient reported slight nausea and sour taste within a couple of hours of taking the pill, which went away within three days, and a second patient had mild diarrhea for five days.

"This study showed for the first time that curcumin treatment was efficacious in decreasing the number of polyps in patients with FAP, similarly to what has been seen with the use of synthetic NSAID agents, but with minimal side effects. Furthermore, we saw that adenomas found in the small intestine of our patients also responded to curcumin," says Cruz-Correa. She says a randomized clinical trial will be conducted between Johns Hopkins and University of Puerto Rico Comprehensive Cancer Center involving more patients. No date has been set for this trial.

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This study was supported by a grant from the National Institutes of Health. Additional researchers who contributed to this study include Daniel A. Shoskes, M.D.; Patricia Sanchez, M.D.; Rhongua Zhao, M.D., Ph.D., and Steven D. Wexner, M. D., of the Cleveland Clinic, Weston, Fla.; and Linda M. Hylind of The Johns Hopkins University School of Medicine.