The combination of two plant compounds that have medicinal properties — curcumin and silymarin — holds promise in treating colon cancer, according to Saint Louis University research published this week in the Journal of Cancer.
Curcumin is the active ingredient in the spice turmeric, which is present in spicy curry dishes, and silymarin is a component of milk thistle, which has been used to treat liver disease.
The researchers and their students studied a line of colon cancer cells in a laboratory model. They found treating the cells initially with curcumin, then with silymarin was more effective in fighting cancer than treating the cells with either phytochemical alone, said Uthayashanker Ezekiel, PhD, corresponding author and associate professor of biomedical laboratory science at Saint Louis University.
"The combination of phytochemicals inhibited colon cancer cells from multiplying and spreading. In addition, when the colon cancer cells were pre-exposed to curcumin and then treated with silymarin, the cells underwent a high amount of cell death," Ezekiel said. "Phytochemicals may offer alternate therapeutic approaches to cancer treatments and avoid toxicity problems and side effects that chemotherapy can cause."
Ezekiel noted the research is a preliminary cell study, with more research ahead before scientists know if the compounds are an effective treatment for people who have colon cancer. He saw promise in using the phytochemicals to help prevent colon cancer, which frequently is caused by lifestyle factors, such as diet.
Scientists will need to study how curcumin and silymarin affect the actions of molecules, such as genetic transcription and expression, that cause cells to change, Ezekiel said. The compounds would then be studied first, in an animal model and second, in humans.
So don't just start taking a bunch of supplements. It's understandable that a study like this one can offer hope to someone coping with or trying to prevent colon cancer. But Ezekiel cautioned that too much of a good thing can be bad for you.
"Concentrations of curcumin and silymarin that are too high could be harmful to people," he said. "We still have much to learn, and for now, it's so much safer to add a little spice to your diet and get your curcumin from foods that contain turmeric, such as curry, rather than taking high doses of the compound."
Please be sure to talk to your healthcare professional before taking these or any supplements.