http://nutrition-news.blogspot.com/2005/02/carrots-cancer-cure.html

It has emerged that scientists at the University of Newcastle upon
Tyne and the Danish Institute of Agricultural Sciences believe from
studies that a chemical found in carrots, falcarinol, may reduce the
risk of cancer. Scientists tested food supplements containing the
chemical on rats with pre-cancerous tumours, discovering that it
reduced the development of tumours by a third. The chemical is also
present in other carrot-related vegetables, as well as ginseng.