and that's the age where all women should be starting regular, annual mamography, assuming they have started before age 45. >> woodruff: so what is the new information that has come in, in the last six years, since the american cancer society said it was most comfortable telling women to start at age 40? what makes you now comfortable to say that it's 45? >> well, actually, our last full guideline for average risk was written way back if 2003. so back then, there was no expectation that guideline groups would balance the benefits and the drawbacks of screening. that now is a standard. we also have some new data about the interval for screening before menopause, and after menopause, and there are also some new observational trials that actually tell us just how valuable mamography is. the goal of this new guideline is to highlight the populations who are at most likely to benefit, most likely to have the greatest benefit, but at the same time, giving women a choice to begin screening earlier and to continue screening more regularly beyond menopause based on her personal values and her

and also important for women to understand that only one, 2% of all women who undergo screening mamography year will have a recommendation for a procedure such as -- >> only one or 2%. >> are you concerned it might be confuse for women to think okay, my doctor says i have to do there is the american cancer society says no i should wait? >> somewhat confusing but we are are at fox chase, recommending that women continue screening beginning at age 40. >> about no danger is it radiation? >> there is a very tiny amount of radiation involved, it is well below the fda limits for this type of test. >> do it anyway just in case, because always better to be safe. >> right. you know, many women that i see every day, who are, for example, called back for additional imaging, are actually quite thankful that we've been simarre tull with their health. >> how it affect some of the results? >> in terms of their age and ongoing -- >> correlation between that. >> between screening mammograms, at a young age, then going on? >> yes. >> why wouldn't you start at like 25? why to wait until 40? >> that's what th

and what i would say is, some of the newer technologies that we have, for example, 3d mamography, reduce we're already heading in the direction of better technology that take the wind out of the sails for the people who are worried about some of the false positives. >> so this is so confusing for women, because you have the american college of obstetricians and gynecologists saying one thing, the american cancer society saying something else. 40, 45, 50, in terms of when to start getting mammograms. what's your best advice? what is a woman to do? >> most of the professional societies, the doctors, the nurses, the caregivers, who -- and oncologists taking care of women with breast cancer every day have, since the beginning, since we've had data available, that shows that starting at age 40, there's a reduction in risk of dying from breast cancer. those are the recommendations that we stick to. and that's what we say. and in addition, switching to every other year mammogram, in the older age groups, doesn't make a lot of sense to us either. considering those are the age groups where the pr