New questions raised about the value of mammograms

Study warns of mammogram over-diagnosis

WASHINGTON (WUSA9) - New questions being raised about the value of routine screening mammograms.

Instead of reducing the incidence of advanced cancers, Danish researchers find breast screenings lead to a substantial over diagnosis of small breast tumors that may never affect the patient’s health during a life time.

A mammogram does not prevent breast cancer, but it can help find breast tumors at the earliest most treatable stage. However, new research finds that leads to over dianosis.

Data from two comprehensive Danish registries find that screenings equaled a substantial increase, about one-in-three, in the detection of small tumors that might never affect a patient's health over a lifetime. But screening was not associated with a reduction in advanced tumors.

Dr. Sara Bruce is a breast surgeon at INOVA Alexandria.

"The problem is we don't have any way to detect at this point whose early cancer is worse than someone else who's more in need  of treatment and so we really end up treating everyone to prevent those that could potentially become worse," said Dr. Bruce. 

The problem with over diagnosis of non-advanced tumors is it unnecessarily exposes patients to the potential harms of surgery, chemotherapy and radiation without any clinical benefit.

Dr. Otis Brawley is the Chief Medical Officer of the American Cancer Society. He believes the focus should be on preventing breast cancer through diet, weight control, exercise and knowing your own personal risk factors. But the findings do not mean that screening should be abandoned.

"If we are aware of the limitations of mammography, it helps us to use mammography better so that we can help the most people.  It also stimulates support for research which can find something better than mammography," said Brawley. 

Dr. Brawley adds the 21st century screening approach will involve genomics along with biopsy, instead of biopsy alone.

© 2018 WUSA-TV


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