Jodi Picoult wrote a novel encompassing a lot of these issues, called "My Sister's Keeper", about a child intentionally conceived/ designed thru assistive reproduction to be an ongoing blood and tissue donor for her older sister's cancer treatment. The story is about the issues surrounding each of the sisters rights to refuse medical care-- in the case of the younger-- to refuse to be forced to be a donor. (The movie version significantly changed the ending from the book-- book was better, IMO.)
http://www.amazon.com/My-Sisters-Ke...=1420833833&sr=1-1&keywords=my+sisters+keeper
I haven't read this book (yet)' but here's a link to an actual story which may have inspired the book. And it's a wonderful story with a happy ending.
http://www.dailymail.co.uk/news/art...cancer-stricken-sister--said-looked-back.html