Eli, check this out!

First go here: http://www.oralcancerfoundation.org/news1.htm and scroll down to the article on Photodynamic Therapy.

Then search the Internet for information about Foscan. I did this some while back, thinking it will be a good thing to know if I have a reoccurrence. Maybe this could be the answer for your sister.

I have my fingers crossed.

Joanna