University of Michigan Oct 30 2025 Doctors may be able to spare patients unnecessarily aggressive breast cancer treatments by collecting and testing cancer cells in patients' blood, research from the University of Michigan and the University of Kansas suggests. Of the 2.3 million women with breast cancer today, around a quarter are diagnosed at an early stage where cancer hasn't spread, called ductal carcinoma in situ, or DCIS. While these patients tend to have a good prognosis, the cancer can