BreastScreen SA does not currently recommend additional tests for asymptomatic women with high breast density who have no other risk factors for breast cancer.
There are no randomised controlled trials that show supplemental imaging (such as MRI, ultrasound or tomosynthesis) saves additional lives in asymptomatic women with high breast density who have no other risk factors for breast cancer.
Supplemental imaging can be of benefit for women with high breast density who have other significant risk factors:
Women with BRCA 1 or 2 gene mutations are recommended to undergo annual breast MRI from the age of 30 to 50 years.
Women with a strong family history of breast cancer are recommended to undergo annual screening mammograms. Clients are eligible to screen at BreastScreen SA from the age of 40 years. Breast Screen SA’s definition of a strong family history is a:
- a first degree relative diagnosed with breast cancer before the age of 50
- a first-degree relative with cancer in both breasts (diagnosed at any age)
- 2 or more first-degree relatives with breast cancer (diagnosed at any age)
Women with previous biopsy results showing a premalignant disease are recommended to undergo annual screening mammograms.
There is some early emerging evidence that supplemental imaging of women with high breast density may detect additional cancers. However, no trials have had sufficient follow-up to show evidence of improved health outcomes or survival benefits for women.
Given this, the incremental and relative benefits of additional testing need to be balanced against the potential harms to women, including heightened anxiety, false positive results (can be as high as 8.1% with ultrasound), unnecessary biopsies and over-diagnosis.
It is important to recognise that regardless of an individual’s breast density, mammography is still the best breast cancer screening test in a population-based screening program for asymptomatic women, aged 50 to 74 years.