Sigrid, I'm in remission for 6 years and doing fine.

I attend a writing critique group, 8-10 people, every Thursday. It's "our turn" about once a month. My book is a collection of essays and poetry, much of which was written at the time I was going through treatment. Last week I got to read, and all in attendance knew my story except for one new guy. When it was his turn to critique me, he said, "No offense, but I hate stories about sick people."

You could hear the jaws drop.

Not one to miss a beat, I said, "Well, I guess you won't be buying my book then!"

The point is, whatever you write, someone won't like it. Don't worry about pleasing everybody, because you can't. Worry about your craft, your story, your creativity, your presentation, etc. If you try to make your book all things for all people, you'll end up with gray nothing.