Most breast cancers are sporadic, not linked to heredity or a known genetic risk. A new Institute of Medicine report tries to answer the question of what women can do to lower their risk. Medical oncologist Aruna Padmanabhan of Temple University Health System says experts are fairly certain that consumer hair dyes, for instance, are no problem, although the research isn't definitive. "But there are many other factors that we can counsel our patients about, as in not using birth control pills if they have a high risk for breast cancer or losing weight, or increasing physical activity, these are things that we can guide our patients with."