cnn. new guide lines for breast cancer screenings muddy iing th waters. today the most influential cancer groups in the country changing its tune when it comes to it mammograms. they used to suggest to begin at age 40. now they are instead saying women can start five years later at age 45. this is coming from the american cancer society. another big change, breast exams for years and years women have been told to get their doctor to check their breasts for lumps. the american cancer society went back on that saying breast. exams with your doctor were no. longer necessary. so joining me now is a doctor with a breast clinic. thank you for joining me. for a lot of women listening to this, it's a bit confusing. why would you not want to start a mammogram at 40? what's your response to that? >> well, we agree that women