Association of mammographic density with risk of ipsilateral breast tumor recurrence and contralateral breast cancer

Mammographic density (MD), which is the reflection of the proportion of fibroglandular tissue in the breast, is a well-known risk factor for breast cancer development. There are conflicting data regarding the association of MD in breast cancer patients with risk of ipsilateral breast tumor recurrence and contralateral breast cancer. A retrospective study in South Korea found that among breast cancer patients undergoing unilateral breast conserving surgery, high MD was associated with increased risk of contralateral breast cancer development but not of ipsilateral breast tumor recurrence.