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Chemical in Veggies Fights Cancer

Mice Experiments Suggest Broccoli Curbs Growth of Prostate, Colon Cancers
WebMD Health News
Reviewed by Louise Chang, MD

April 5, 2006 (Washington) -- A chemical found in broccoli, cabbage, cauliflower, and other cruciferous vegetables can curb the growth of prostate tumors, new research in mice shows.

"Men with prostate cancer should listen to their mothers -- eat your veggies," says researcher Stanley W. Marynowski Jr., MS, of the University of Pittsburgh Cancer Institute.

The new study, presented at the annual meeting of the American Association for Cancer Research, offers news insights into how vegetables protect the body against cancer, he says.

The research focused on a substance found in cruciferous vegetables called phenethyl-ITC, or PEITC, that is formed when vegetables are either cut or chewed. In lab experiments, PEITC killed off cancer cells through a process known as apoptosis. Advances Against Colon CancerAdvances Against Colon Cancer

"Since we knew PEITC can kill cancer cells, we wanted to see what would happen to established tumors when mice were treated with this compound," Marynowski tells WebMD.

For the study, mice were grafted with human prostate tumors. Then they were fed small amounts of PEITC daily.

The compound slowed the growth of tumors, Marynowski reports. "After 31 days of treatment, the size of the tumors in the treated animals was about half that of the untreated animals."

The researchers now hope to do human studies testing PEITC for prostate cancer prevention in men.

Crunchy Veggies Also Fight Colon Cancer

Tim Oo Khor, PhD, a researcher at Rutgers University in Piscataway, N.J., who is also studying the role of cruciferous vegetables in cancer prevention, says the results are very promising.

"You can significantly decrease tumor volume and effects start to be seen as soon as 16 days after treatment," he tells WebMD.

Khor's study, also presented at the cancer meeting, focused on the role of an antioxidant called sulforaphane in colon cancer prevention. Like PEITC, sulforaphane is released when you chew on broccoli and certain other crunchy vegetables.

For the study, the researchers used mice engineered to be a model for an inherited colon polyp condition seen in people, called familial adenomatous polyposis. People with the condition develop polyps in the colon and are at high risk for the development of colon cancer; left untreated, there's almost a 100% chance cancer will develop.

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