Black Raspberries are being researched at several institutions across the country, including here at the James Cancer Hospital/Solove Research Institute in Columbus. They have been found to have a high concentration of anitoxidants, and specifically, ellagic acid, which has been observed to be a cancer retardant in animals. LSU is also doing similar research.

So far, most of the work has focused on esophageal and colon cancer, thought some studies have shown an impact in oral cancer as well. As Brian said, there are several articles on the site dealing with this.

I think our own EZJim was part of a study on the impact of black raspberries on recurrence in oral cancer, but I'll let him chime in on that. ;-)