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Breast density, outcomes of supplemental breast cancer screening

Date:
April 26, 2016
Source:
The JAMA Network Journals
Summary:
The screening performance of digital mammography combined with tomosynthesis (a type of imaging) has been compared to digital mammography alone for women with varying levels of breast density.
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In a study appearing in the April 26 issue of JAMA, Elizabeth A. Rafferty, M.D., formerly of Massachusetts General Hospital, Boston, and colleagues evaluated the screening performance of digital mammography combined with tomosynthesis (a type of imaging) compared with digital mammography alone for women with varying levels of breast density.

Breast density is associated with reduced mammographic sensitivity and specificity, and increased tumor size and worsened prognosis are associated with increased breast density. Currently, 24 states have laws mandating that women be notified of the implications of breast density, thereby encouraging discussions between patients and physicians regarding the need for supplemental screening. However, which, if any, additional testing should be recommended for women with dense breasts is not known.

This study included data from screening performance metrics from 13 U.S. institutions, which were reported for 12 months using digital mammography alone and from the date of introduction of tomosynthesis. Subgroups included the 4 breast density categories used for clinical reporting. Overall and invasive cancer detection rates and recall rate with and without tomosynthesis were analyzed in patients with both nondense and dense breasts.

Of 452,320 examinations, 278,906 were digital mammography alone and 173,414 digital mammography plus tomosynthesis; 2,157 cancers were diagnosed. The researchers found that the addition of tomosynthesis to digital mammography for screening was associated with an increase in cancer detection rate and a reduction in recall rate for women with both dense and nondense breast tissue. "These combined gains were largest for women with heterogeneously dense breasts, potentially addressing limitations in cancer detection seen with digital mammography alone in this group, but were not significant in women with extremely dense breasts."

The authors note that for women classified as having dense breast tissue, most have heterogeneously dense breasts, mandating caution in drawing conclusions regarding the performance of tomosynthesis for the small proportion of women with extremely dense breasts.


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Materials provided by The JAMA Network Journals. Note: Content may be edited for style and length.


Journal Reference:

  1. Elizabeth A. Rafferty, Melissa A. Durand, Emily F. Conant, Debra Somers Copit, Sarah M. Friedewald, Donna M. Plecha, Dave P. Miller. Breast Cancer Screening Using Tomosynthesis and Digital Mammography in Dense and Nondense Breasts. JAMA, 2016; 315 (16): 1784 DOI: 10.1001/jama.2016.1708

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The JAMA Network Journals. "Breast density, outcomes of supplemental breast cancer screening." ScienceDaily. ScienceDaily, 26 April 2016. <www.sciencedaily.com/releases/2016/04/160426115514.htm>.
The JAMA Network Journals. (2016, April 26). Breast density, outcomes of supplemental breast cancer screening. ScienceDaily. Retrieved May 23, 2017 from www.sciencedaily.com/releases/2016/04/160426115514.htm
The JAMA Network Journals. "Breast density, outcomes of supplemental breast cancer screening." ScienceDaily. www.sciencedaily.com/releases/2016/04/160426115514.htm (accessed May 23, 2017).

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