Chemicals in Curry and Onions May Help Stop Colon Cancer��� The newspaper of The Johns Hopkins University August 7, 2006 | Vol. 35 No. 41
Chemicals in Curry and Onions May Help Stop Colon Cancer
By Eric Vohr
Johns Hopkins Medicine
A small but informative clinical trial by Johns Hopkins investigators shows that a pill combining chemicals found in turmeric, a spice used in curries, and onions reduces both the size and number of precancerous lesions in the human intestinal tract.
In the study, published in the August issue of Clinical Gastroenterology and Hepatology, five patients with an inherited form of precancerous polyps in the lower bowel known as familial adenomatous polyposis, of FAP, were treated over an average of six months with regular doses of curcumin, the chemical found in turmeric, and quercetin, an antioxidant in onions. The average number of polyps dropped 60.4 percent, and the average size dropped by 50.9 percent, according to a team led by gastroenterologist Francis M. Giardiello, a professor at the School of Medicine, and Marcia Cruz-Correa, a visiting professor from the University of Puerto Rico School of Medicine.
"We believe this is the first proof of principle that these substances have significant effects in patients with FAP," Giardiello said.
Familial adenomatous polyposis is a disorder that runs in families and is characterized by the development of hundreds of colorectal adenomas (polyps) and eventual colon cancer. Recently, nonsteroidal anti-inflammatory drugs, known as NSAIDs, have been used to treat some patients with this condition, but these compounds often produce significant side effects, including gastrointestinal ulcerations and bleeding.
Previous observational studies in populations that consume large amounts of curry, as well as laboratory research on rodents, have strongly suggested that curcumin — a relatively innocuous yellow pigment extracted from turmeric, the powdered root of the herb curcuma longa and one of the main ingredients in Asian curries — might be effective in preventing and/or treating cancer in the lower intestine, according to Cruz-Correa. Curcumin has been given to cancer patients, she said, and previous studies have demonstrated that it is well tolerated at high doses.
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, Giardiello said that due to their relative dose levels, he believes 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," Giardiello said. 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 Florida. All had previously had their colons surgically removed; four of the five retained the rectums, whereas the remaining patient had 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. Another 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 a sour taste within a couple of hours of taking the pill, an effect that 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, similar 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," Cruz-Correa said.
A randomized clinical trial involving more patients will be conducted at Johns Hopkins and the University of Puerto Rico Comprehensive Cancer Center, she said. No date has been set for this trial.
This study was supported by a grant from the National Institutes of Health. Additional researchers who contributed to this study are Daniel A. Shoskes, Patricia Sanchez, Rhongua Zhao and Steven D. Wexner, all of the Cleveland Clinic Florida; and Linda M. Hylind, of the Johns Hopkins School of Medicine.
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