Black raspberries previously have been shown to reduce the risk of oral, esophageal and colon cancer in animal models, according to the researchers, who called for further study in humans.
Dietitian Wendy Demark-Wahnefried, a professor of behavioral science at M.D. Anderson Cancer Center at the University of Texas in Houston, said she would feel comfortable advising people with Barrett's to eat black raspberries. "It couldn't hurt," she said, but added that further studies need to find out if the berries really do prevent cancer.
In other research presented at the meeting, broccoli sprouts and cruciferous vegetables both showed promise in the fight against bladder cancer, according to two separate teams from the Roswell Park Cancer Institute in Buffalo, N.Y.
Using a rat model, a team lead by Dr. Yuesheng Zhang, a professor of oncology, demonstrated that a broccoli sprout extract reduced bladder cancer in rats by 70 percent.
"Our present study shows that broccoli sprout extracts fed to rats in the diet inhibits bladder cancer development induced by a carcinogen. We don't yet know if the extracts inhibit the growth of a existing bladder cancer," said Zhang, who explained that broccoli sprouts are a rich source of a well-known cancer preventive agent known as sulforaphane.
"We next plan to find out if broccoli sprout extracts can fight bladder cancer in humans," Zhang noted.
A second team at the institute found that people who ate three or more servings of raw, cruciferous vegetables per month reduced their risk of bladder cancer by 40 percent. Cruciferous vegetables include broccoli, cabbage and cauliflower.
The team analyzed the dietary habits of 275 people with early bladder cancer and 825 people who were cancer-free. The researchers specifically asked how many servings of raw or cooked cruciferous vegetables they at
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