Efudex (Fluorouracil) Skin Cancer Treatment

http://www.washingtonpost.com/wp-srv/artsandliving/fashionandbeauty/features/2006/skin-sense/may08.html

This story is the second place I have read that actinic keratosis is pre-cancer to Squamous Cell Carcinoma, specifically. I had thought that AK’s could turn into Basal Cell Carcinoma (BCC) as well as SCC,  but this article suggests otherwise.