....it does not work that way. If the ratio of healing factor to cancer was raised, he would simply LOOK NORMAL and not hideous. We've ESTABLISHED this.
Come ON, Norman. What the hell do you think a tumor is? An abnormal GROWTH of cells. Are you saying that cancer exclusively wastes you away? And that a REGENERATIVE healing factor will do anything other than REGENERATE?
That's why his healing factor is so goddamn confused. The cancer's growing and his healing factor is trying to cut it out. He ends up with a nice, shifting array of lesions and tumors and other such nastiness on his skin. Tada. IT'S THE BASIS OF THE CHARACTER. If you're gonna do fake science, DO IT CONSISTENTLY.
I hope that they hit him with this and he gets up and goes "Woo, I look normal! Thanks, guys!" and skips away. With Bob.