[Comment] Supplemental ultrasound screening lowers advanced breast cancers

The goals of breast cancer screening are to detect breast cancers as early as possible to reduce both mortality and the morbidity of therapy. It is well established that mammography is less sensitive in women with dense breast tissue. These women have higher rates of interval cancers and more advanced stage diagnoses at detection,1 and they derive a smaller breast cancer mortality reduction from screening mammography compared with women with non-dense breasts.2