Glioblastoma multiforme in the corpus collosum and spreads into the right and left hemispheres. Called a butterfly tumor

My Dad is 74 and was just diagnosed with a glioblastoma multiforme in the corpus collosum. They said it spreads into the left and right hemisphere and is called a "butterfly tumor". They have given him 5 more weeks to live. They said it is inoperable. They said any treatments they could give would not really help enough and would make him very miserable. He also has diabetes and high blood pressure.

I don't want to accept yet that there is nothing they can do for him. Does anyone know anything about this type of tumor and anyone who can do anything about it?

Thanks,
Stinkerpot - nickname from Daddy :)