has a voice in the book? if the cancer left from my brain surgery has an active voice until it is fully eliminated by radiation and chemotherapy treatments, what style would the living cancer be classified under, narrative or what?

That sounds like an interesting story. I'd like to read it and I know a brain tumor survivor who would too. How far along is the book? If possible I'd like to know the title and date I can get a copy.

Yes, narrative certainly. You have to choose what point of view you want to give the cancer: omniscient (all-knowing of all characters in the book), first-person (observations from the cancer's point of view), or third-person-limited (outside narration focusing on one character's point of view, perhaps the cancer.)...The final death scene of the cancer will be great, huh? kind of like when the astronaut unplugged HAL...

Writing sounds complicated, but I bet it's coming easily to you anyway right about now. The cancer will tell the story in its own insistent style, and you'll find it.

Anyway, so very happy to read you survived brain cancer! Friends with bad diagnoses have also survived... they have great oral stories, too. I hope your book gets written and published! Hang in there...

Wouldn't the cancer start getting older, sicker, and close to dying itself? I am a survivor myself, and I kept telling myself that no matter how sick I am from the chemo, the cancer was even more sick. I still heard it keep trying, but I tried harder.
I kept telling myself that I was stronger than the cancer and it would die first. I guess that constitutes a narrative dialogue.

I guess it did as I'm six years post-op.

Probably narration, quotes.

Interesting, it'd be the same as a person with MPD, before integration!!

See:
The Three Faces of Eve
Sybil