News | July 06, 2012

Breast Cancer Risk Can Be Lowered by Avoiding Unnecessary Medical Imaging

UCSF analysis of IOM report on environmental causes of breast cancer suggests way to reduce risk

July 6, 2012 — A report issued by the Institute of Medicine (IOM) last December reviewed all the available scientific data compiled to date about potential environmental risks of breast cancer—factors such as pesticides, beauty products, household chemicals and the plastics used to make water bottles.

Commissioned by the breast cancer foundation Susan G. Komen for the Cure, the IOM report concluded that there was not enough data to confirm or rule out that exposure to most of these factors caused breast cancer. However, the report did identify two factors that definitely increased risk: post-menopausal hormone replacement therapy and radiation exposure from medical imaging.

Now, a special article in the journal Archives of Internal Medicine details the findings of the IOM report as they relate to medical imaging, and what women can do to minimize their risk of breast cancer.

“The single thing that the IOM highlighted that a woman can do to lower her risk of breast cancer is to avoid unnecessary medical imaging,” said Rebecca Smith-Bindman, M.D., professor of radiology and biomedical imaging, epidemiology and biostatistics at UCSF, who wrote the article and contributed to the IOM report.

What a Woman Should Know to Ask Her Doctor
While CT (computed tomography) scans and other forms of medical imaging have revolutionized medicine and can be life-saving, said Smith-Bindman, women need to engage their doctors in the decision-making process and insist on the necessity and safety of all radiological scans they undergo.

"They should understand the risks and benefits and ask their doctor to explain the risks and benefits as well as the radiation burden from the scan,” said Smith-Bindman.

Questions patients should ask their doctors questions include:

  • Is this scan absolutely necessary or can we make decisions about my care without it?
  • Is it necessary to do it now?
  • Are there other alternative tests?
  • How can I be sure the test will be done in the safest way possible?
  • Will having the scan information change the management of my disease in a positive way that cannot happen without the scan?
  • Can I wait until after seeing a specialist before getting the scan?


The article, “Environmental Causes of Breast Cancer and Radiation from Medical Imaging/Findings from the Institute of Medicine Report,” appears in the Archives of Internal Medicine on June 11, 2012.

For more information: www.archinte.jamanetwork.com

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