When the going gets tough, grape seed extract gets going: A University of Colorado Cancer Center study recently published in the journal Cancer Letters shows that the more advanced are colorectal cancer cells, the more GSE inhibits their growth and survival. On the other end of the disease spectrum, GSE leaves healthy cells alone entirely.
"We've known for quite a while that the bioactive compounds in grape seed extract selectively target many types of cancer cells. This study shows that many of the same mutations that allow colorectal cancer cells to metastasize and survive traditional therapies make them especially sensitive to treatment with GSE," says Molly Derry, doctoral candidate in the lab of Rajesh Agarwal, PhD, investigator at the CU Cancer Center and professor at the Skaggs School of Pharmacy and Pharmaceutical Sciences.
Derry notes this is an especially important finding in light of increasing colorectal cancer rates (due in part to increasingly high-fat diets and sedentary lifestyles) and a low screening rate; that means 60 percent of patients diagnosed have already reached the advanced stage of the disease.
"Finding a way to selectively target advanced colorectal cancer cells could have major clinical importance," Derry says.
The group performed their experiments on colorectal cancer cell lines representing various stages of the disease. Whereas it generally takes much more chemotherapy to kill a stage IV cancer cell than a stage II cancer cell, Derry saw that the reverse was true with grape seed extract.
"It required less than half the concentration of GSE to suppress cell growth and kill 50 percent of stage IV cells than it did to achieve similar results in the stage II cells," Derry says.