Can Breast Cancer Surgery Nurture New Tumors?
Controversial Theory: Tumor Removal Unleashes Cancer Growth Factors in Younger Women
Breast Cancer Screening Paradox continued...
"We don't have all the answers," Retsky says. "We think our work has pointed out that the mammography paradox is real. We are confident we understand what causes it. We have identified a problem -- a mechanism that is testable. We have not found a solution. But identifying the problem is a major step in the right direction."
Retsky and colleagues report their findings in the current issue of the International Journal of Surgery.
American Cancer Society Says It Isn't So
Don't believe any of this, says Robert A. Smith, PhD, director of cancer screening for the American Cancer Society.
"The data don't add up to Dr. Retsky's conclusion," Smith tells WebMD. "The idea that surgical interruption of the tumor bed will cause death this rapidly just does not make sense."
Smith, a strong proponent of early and regular breast cancer screening, says the apparent screening paradox does not exist.
"You do not expect mammograms to be instantly beneficial," he says. "When you first invite women to screening, you get some with tumors that are already advanced. And not all of the women will respond to the invitation to screening. They may die next year or the year after, and because they were invited, they will be counted as a death in the screening group. So you really can't look at this pattern and make any sense out of it."
Young women, Smith says, tend to get more aggressive breast cancers.
"So the idea these women became worse after surgery may stem from the fact that their prognosis may have been poorer to begin with," he says.
And Smith notes that Retsky's data are based on observations from long ago, when breast cancer screening was in its infancy.
"The interesting thing is how beneficial modern, high-quality mammography can be," he says. "Mammograms are quite a bit better today than in the clinical trials that proved they saved lives."