Detailed text transcripts for TV channel - CNN - 20110508:00:50:00
And for now, the brain scan is only effective on people over age 60. doctors are not ready to use these tests as screening tools like, say, a mammogram, just yet. ron reagan watched me take the tests on this day, decided he didn't want to take any of his own. >> you don't want to know if you'll get it? >> until they come up with a cure or a real definite treatment, i'd just as soon remain blissfully ignorant. >> how well is our understanding of it improving? >> i think we've made enormous strides in terms of understanding alzheimer's disease. we know that there are several proteins involved. w...