Compounds in cranberries may help improve the effectiveness of platinum drugs that are used in chemotherapy to fight ovarian cancer, researchers have found in a laboratory study that will be reported at the 234 th national meeting of the American Chemical Society.
The scientists demonstrated in cell culture studies that human ovarian cancer cells resistant to platinum drugs became up to 6 times more sensitized to the drugs after exposure to the cranberry compounds in comparison to cells that were not exposed to the compounds, which were obtained from juice extracts.
Although preliminary, the findings have the potential to save lives and reduce the harmful side effects associated with using high doses of platinum drugs for the treatment of ovarian cancer, the researchers say, adding that human studies are still needed. The new study adds to a growing number of potential health benefits linked to cranberries.
"For the first time, we have shown in our in vitro studies that cranberry extracts can sensitize resistant human ovarian cancer cell lines," say study co-presenters Ajay P. Singh, Ph.D., and Nicholi Vorsa, Ph.D., natural products chemists at Rutgers University. "This has opened up exciting possibilities for therapeutic intervention associated with platinum therapy," add Singh and Vorsa, who collaborated with colleagues Laurent Brard, M.D., Ph.D, Rakesh K. Singh, and K.S.Satyan, Ph.D., of Brown University.
But the researchers caution that the study is experimental and that patients with ovarian cancer should always consult with their physicians before trying any type of anti-cancer therapy. Ovarian cancer is the seventh most common cancer and the fifth leading cause of cancer death among women in the United States, according to the Centers for Disease Control and Prevention.
Chemotherapy using platinum drugs, including cisplatin and paraplatin, is a mainstay treatment for ovarian cancer. However, cancer cells tend to develop resistance to platinum therapy and higher doses of the drugs can cause unwanted side-effects, including nerve damage and kidney failure.
The new study focused on cranberry juice because of past research suggesting that the juice has a wide range of potential health benefits, including the ability to fight urinary tract infections, stomach ulcers, and cancer. Singh and his associates obtained ovarian cancer cells that were relatively resistant to platinum. They treated the cells with various doses of a purified extract of commercially available cranberry drink (containing 27 percent pure juice), exposed the cells to the platinum drug paraplatin and compared them to cells that were not exposed to the extract.