Kornelia Polyak

HSCI researchers sampled biopsies from women participating in the Nurses' Health Study. In healthy breast tissue (pictured above), the percentage of cells expressing molecular marker Ki67 (green) and p27 (red) is low. Photo courtesy of Sung Jin Huh...

An international scientific collaborative led by the Harvard Stem Cell Institute’s Kornelia Polyak, MD, PhD, has discovered why women who give birth in their early twenties are less likely to eventually develop breast cancer than women who don't...