— Since 1975 there has been a 400% increase in “in situ” breast cancer among pre-menopausal women under 50 years old. This mirrors the increased use of birth control over these same years. (“In situ” is a medical term which means “at the location” .
— A Mayo Clinic study confirms that any young girl or woman who is on hormonal birth control for 4 years prior to their first full term pregnancy increases their breast cancer risk by 52%. 
 Kahlenborn et al., “Oral Contraceptive Use — as a risk factor for pre-menopausal breast cancer: a meta analysis,” Mayo Clinic proceedings 2006 pp. 1290-1320, 2006
If you want more information, go to http://jenngiroux.com/2012/02/14/deadly-health-risks-for-women-the-unspoken-side-of-the-obama-birth-control-mandate/