YALE UNIVERSITY New Haven, Conn. — Older women with a very early, non-invasive breast cancer known as ductal carcinoma in situ (DCIS) gain no long-term benefit from undergoing a sentinel lymph node biopsy to see if the cancer has spread, new research by the Yale School of Public Health has found. The study, believed to be the first to examine the long-term impact of sentinel lymph node biopsies on thousands of older women, found...