Presented by Bayer
Breast density – and its implication for breast cancer screening – is a topic garnering major attention today. About half of all women over 40 who get mammograms are found to have dense breasts, which can obstruct tumour detection on a mammogram.1 Furthermore, women with dense breasts are at an increased risk for breast cancer.1

Here’s a snapshot of the information found on MyRadiologyScan.ca:
- Breast density is the ratio of fibrous tissue to fat within the breast; more fibrous tissue makes a denser breast
- Individuals with dense breasts have a greater risk of developing breast cancer vs. those with fatty breasts2
- X-ray mammography (for breast cancer detection) is less effective in women with dense breasts
- Hence, cancer is more often missed or found later in advanced stages in women with dense breasts3
- Supplemental imaging methods include contrast-enhanced mammography, contrast-enhanced MRI, tomosynthesis and ultrasound
- Certain factors can affect breast density, including:4-6
- Age: Breast tissue tends to become less dense after menopause
- Body Mass Index: Women with less body fat are more likely to have dense breast tissue
- Hormones: Women on combo hormone therapy for menopause are more likely to have dense breast tissue
- Genes: Breast density is influenced by heredity
It’s a heavy discussion, but it’s a critical discussion. And we encourage you to leverage our website for support.
References
- Dense Breasts: Answers to Commonly Asked Questions. https://www.cancer.gov/types/breast/breast-changes/dense-breasts, Accessed August 2021
- Impact of breast density on the presenting features of malignancy. https://www.ncbi.nlm.nih.gov/pubmed/20853035, Accessed September 2021.
- Dense Breasts: Answers to Commonly Asked Questions. https://www.cancer.gov/types/breast/breast-changes/dense-breasts, Accessed September 2021.
- Dense breast tissue: What it means to have dense breasts. https://www.mayoclinic.org/tests-procedures/mammogram/in-depth/dense-breast-tissue/art-20123968, Accessed September 2021.
- What does it mean to have dense breasts? https://www.webmd.com/breast-cancer/densebreasts#1, Accessed September 2021.
- Common variants in ZNF365 are associated with both mammographic density and breast cancer risk. https://www.nature.com/articles/ng.760, Accessed September 2021.