I can start and then I'll turn it over to Jennie Dale.
Dense breasts absolutely are an issue. For us, it means that our mammograms are not as effective at diagnosing breast cancer. We know that, overall, about 40% of women have dense breasts, and under the age of 50, about 50% of women have dense breasts. That means 50% of women have non-dense breasts, and the mammogram works beautifully in those women. For women with dense breasts, we recommend additional screening. You have to start with a mammogram because it's the only way that's been shown to reduce breast cancer mortality, but we need to add other screening tests. Very strong evidence exists to add either a breast MRI every two years or a breast ultrasound every year. That's the best way to identify early-stage breast cancer.
I'll let Jennie Dale add to that.