BUFFALO N.Y. -- Geographers and epidemiologists from the University at Buffalo using life-course data from a cohort of breast cancer patients and controls in Western New York and geographic information systems (GIS) technology have shown that women who developed breast cancer before menopause tend to cluster based on where they were born and where they lived at their menarche (start of menstruation). The clustering indicates that these women may have been exposed to something in the environment at those times in their lives that increased their risk of developing premenopausal breast cancer...