Hi Karen,
If you do a search for 'raspberries' on the OCF site, you will find a number of articles in the news section about the potential for black raspberries. There was one posted in 2001, see
http://www.oralcancerfoundation.org/news/story.asp?newsId=58
An update on January 10th, 2005, see
http://www.oralcancerfoundation.org/news/story.asp?newsId=536
Seems like some of these articles get recycled by various newspapers over time.
Nonetheless, the early results on the black raspberry gel look very promising. Hopefully, a clinical trial will prove their effectiveness. - Sheldon