11.   Doctors put an anesthetic on the nipple and insert a threadlike catheter to flush milk ducts with fluid that dislodges and draws out cells.

12.   Nearly all breast cancers start in the milk ducts.

13.   Options might include anticancer drugs, having part of the milk duct removed, or more frequent checks to see if they progress to cancer, he said.

14.   Younger women have more milk ducts for DCIS to infiltrate, Vicini noted.