Is There an Anticancer Diet?
Eating Certain Fruits and Vegetables May Decrease Cancer Risk and Even Stop Its Growth
Black Raspberries May Reduce Esophageal Cancer Risk continued...
"At the end of the study, 58% of the patients had marked declines in the 8-Isoprostane," reflecting less oxidative stress.
The researchers also looked at tissue levels of an enzyme called GSTpi, which helps detoxify carcinogens. They found that 37% of patients had an increase in this protective enzyme.
The fruit "appears protective," Kresty tells WebMD, although the study did not include long-term follow-up to see if fewer people actually got cancer.
Black raspberries, she says, are found in some grocery stores. "More commonly they are the type you pick," she says.
Vegetables for Bladder Cancer Prevention
Raw cruciferous vegetables such as broccoli, broccoli sprouts, cabbage, and cauliflower seem to reduce bladder cancer risk by about 40%, researchers from Roswell Park Cancer Institute in Buffalo, N.Y., reported at the meeting. That's due to compounds they contain called isothiocyanates or ITCs, thought to be protective against bladder cancer.
"Raw cruciferous vegetables are better than the cooked vegetables because cooking time reduces the amount of isothiocyanates by 60% to 90%," says Li Tang, MD, PhD, a postdoctoral fellow at Roswell Park who led one of the studies.
Her team surveyed the eating habits of 275 people with a diagnosis of bladder cancer and 825 healthy people. They asked them about pre-diagnosis intakes of raw and cooked vegetables, their cigarette smoking habits, and other risk factors.
Nonsmokers who ate at least three servings a month were about 73% less likely to develop bladder cancer than those who smoked and ate less than three servings a month.
Broccoli sprouts may be even better to ward off bladder cancer, says Yuesheng Zhang, MD, PhD, professor of oncology at Roswell Park Cancer Institute, who studied the effect of broccoli sprouts in animals. His team studied four groups of animals. One group drank a solution known to cause bladder cancer and ate freeze-dried extracts of broccoli sprouts; other groups just ate the broccoli extract or just drank the carcinogen. Another group did nothing, serving as the comparison group.
"Of those who took the carcinogen [only], 96% had a tumor" after 10 months, he says. Of those who drank the carcinogen and also ate the broccoli extract, only 37 developed cancer.
Again, it's the ITCs that are thought to be protective. Broccoli sprouts seem to work, he says, by activating two enzymes important in detoxifying carcinogens.