'Personalized medicine' reads DNA for effective treatments

Experts say that most drugs, whatever the disease, work for only about half the people who take them. Not only is much of the nation's approximately $300 billion annual drug spending wasted, but countless patients are being exposed unnecessarily to side effects. No wonder so much hope is riding on the promise of "personalized medicine," in which genetic screening and other tests give doctors more evidence for tailoring treatments to patients, potentially improving care and saving money.