Google Dr. Tullio Simoncini - He uses Iodine tincture to treat skin cancers.
Dr. Simoncini believes that cancer is a fungus (as do I) and has great success with treating internal cancers with baking soda...but I've read that he treats skin cancers with Iodine topically (not sure if it's Iodine alone or in conjunction with other ingredients but based on the link below it looks like it's just Iodine)
I did find this:http://www.topicalinfo.org/forum/topic.asp?TOPIC_ID=1007
Iodine causes apoptosis of cancer cells.
Iodine is antiparasitic, antifungal, antiviral, antibacterial