BOSTON -- The American Cancer Society recommends yearly mammograms for all women 40 and older, but are the guidelines that are set up enough to protect all women?

Some radiologists admit that screening women over 40 will catch no more than 95 percent of breast cancers.

"There are 5 percent of women who are between the ages of 35 and 40 that we know will have breast cancer, and I believe, personally, that we should start screening women at 35," Beth Israel Deaconess Medical Center's Dr. Valerie Fein-Zachary said.

NewsCenter 5's Kelley Tuthill falls into this category of women. She was diagnosed at age 36.

Should all women start getting mammograms at age 35? Medical editor Dr. Timothy Johnson answered some questions many women have.

"There are many radiologists who believe that, but in fact, there are no studies to prove that that would really make a difference, and I checked with one of the most prominent radiologists in the country and he said they are not recommending it, but what they do recommend is that a woman who comes from a very high-risk family may need to start mammograms at a much earlier age."

Some women should start mammograms at 10 years younger than the age that your mother or sister got breast cancer, Johnson said.

"If your sister was diagnosed at 40, you'd start them at age 30," Johnson said. "That probably is a rule worth following. We do not recommend routine mammograms starting at 35."