The purpose of this clinical trial is to determine whether screening for breast cancer with tomosynthesis mammography is superior to digital mammography. To determine that, we are studying whether women who are screened for breast cancer with tomosynthesis mammography have fewer advanced breast cancers compared with the number of such cancers found when women are screened for breast cancer with digital mammography. This study will also compare whether there is a difference in the number of additional tests recommended after tomosynthesis mammography and digital mammography.
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