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Watercress extract detoxifies smokers

82 cigarette smokers were enrolled in the randomized clinical trial.

Washington D.C.: Research says watercress extract taken multiple times a day significantly inhibits the activation of a tobacco-derived carcinogen in cigarette smokers.

The trial showed that the extract detoxifies environmental carcinogens and toxicants found in cigarette smoke, and that the effect is stronger in people who lack certain genes involved in processing carcinogens.

"Cigarette smokers are at far greater risk than the general public for developing lung cancer, and helping smokers quit should be our top cancer prevention priority in these people," said researcher Jian-Min Yuan, associate director of the UPCI's Division of Cancer Control.

"But nicotine is very addictive, and quitting can take time and multiple relapses. Having a tolerable, nontoxic treatment, like watercress extract, that can protect smokers against cancer would be an incredibly valuable tool in our cancer-fighting arsenal," he added.

82 cigarette smokers were enrolled in the randomized clinical trial.

The participants either took 10 milligrams of watercress extract mixed in one milliliter of olive oil four times a day for a week or they took a placebo. Each group of participants then had a one week "wash-out" period where they didn't take anything and then switched so that those getting the placebo now received the extract. They all continued their regular smoking habits throughout the trial.

In one week, the watercress extract reduced activation of the carcinogen known as nicotine-derived nitrosamine ketone in the smokers by an average of 7.7 percent.

It increased detoxification of benzene by 24.6 percent and acrolein by 15.1 percent, but had no effect on crotonaldehyde. All the substances are found in cigarette smoke.

Participants who lacked two genes involved in a genetic pathway that helps the antioxidant glutathione remove carcinogens and toxicants from the body saw an even bigger benefit to taking the watercress extract, which increased their detoxification of benzene by 95.4 percent, acrolein by 32.7 percent and crotonaldehyde by 29.8 percent.

A phase III clinical trial in hundreds of people must be performed before the treatment could be recommended for smokers, and Dr. Yuan warned that while eating cruciferous vegetables, such as watercress and broccoli, is good for people, they are unlikely to have the same pronounced effect as the extract.

The study has been read in American meeting of Association for Cancer Research.

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