How not to solicit a review:
The digital galley proofs of my new biothriller XYZ are now ready for review. […]I am not requesting a complete review, just one to three sentences giving your general opinion of the novel. You probably won't need to read the entire book, just enough of it to to form some general impressions. Of course, if you prefer reading it all the way through in order to write a more complete review, please do.