12 minutes past the hour right now. a simple blood test could be a powerful new weapon in the fight against cancer. in fact, it's said to be so precise, it can detect a single cancer cell among a billion healthy ones it could be five or ten years before this is available, but experts are calling it a major break through in cancer treatment and diagnosis. dr. rawle joins us from atlanta. >> good morning. thank you for having me. >> a test that could detect a single cancer cell, it sounds amazing. why is this such a big deal? >> early detection is very important for a cure this helps us follow people that have been treated so we can see if the treatment is actually working or not working, save them from getting a needless treatment. this also could be a great