Best of luck to your son and you.
This is a company doing clinical trials of a new drug derived from a scorpion venom that seems to be attacking only the cancerous cells in the brain. I am sure you have already heard about it, but just in case you havent:
http://neurophilosophy.wordpress.com...t-for-gliomas/
http://www.transmolecular.com/patien...al_trials.html