http://tru-faith-lost.livejournal.com/tag/living+out+loud. Gen, not death.

I second this one. I LOVE that fic. It's smart, and awesome, and I cannot rec it enough!

I don't know of any based on the book, but tru_faith_lost wrote
'C'hange or "How the Guitar Hero Gets His Bitch" (http://tru-faith-lost.livejournal.com/57835.html), which is Jared/Jensen and Jensen has cancer. There's also Spirit Fall (http://www.fanfiction.net/s/2964361/1/Spirit_Fall), which is teen!Dean with cancer, neither of these are deathfics.

I second this rec. I love "...Guitar Hero..."

Since I don't know My Sister's Keeper I don't know what exactly you're looking for, but if it's Cancer!Fic, Nocturniquette has just finished her J2 Both Sides Now

http://nocturniquette1.livejournal.com/tag/both+sides+now

This is an amazing story.

Scriptcat is up to chapter 16 of her J2 cancer WIP As a Good Thing

http://scriptcat.livejournal.com/27933.html
I encourage you to read all the warnings.

I second Both Sides Now. Amazing, moving story.

I don't know the movie but in I Stole Away and Cried (http://mindclutter.dreamingincolour.net/viewstory.php?sid=70) Jared has a cancer. That page doesn't have warnings on it so be aware :)

i was actually thinking about if someone had done that before. because the book is amazing. I look forward to the movie. And i am glad you asked for this.