The known risk factors for breast cancer development (including family history, genetics, and prolonged exposure to estrogen) account for only 30 % of women diagnosed with breast cancer. (proactive-healthcare.com)
DNA extracts from peripheral blood specimens were obtained from a population - based case - control study of risk factors for breast cancer in women 21 to 45 years old. (journals.plos.org)
«Our study suggests that breast density alone might not be strong independent risk factor for breast cancer,» she said. (sciencedaily.com)