My father was diagnosed with the exact same in January 2020 and lasted 4 months.

I'm guessing its late stage III if George Perez has refused treatment and I can't blame him. Radiotherapy is seriously debilitating and would likely ruin whatever time he has left, I know because my girlfriend unfortunately went through it this year and there wasn't a happy ending to that story either.

Mother-f***ing cancer is a cold hearted son of a b****.

Best of luck George. You have a fantastic legacy and people will still be marvelling over your books a hundred years from now.