Marj Plumb, DrPH, looks back on research presented in an earlier session regarding Korenman's suggestion in 1980 that puberty and perimenopause were two "windows" of maximum breast cancer inducibility by environmental carcinogens. The previous session focused on several exposures that are of particular relevance to peri- and postmenopausal women including obesity, postmenopausal hormone use, and environmental chemicals. The potential connections between the different windows of susceptibility are also addressed. (#25030)