In general, ILC is detected in patients at an older age and at a more advanced stage than IDC 9 levitra et alcool A genome wide association study looking at nearly 600, 000 single nucleotide polymorphisms SNPs for each breast cancer and matched controls from postmenopausal women in the first breast cancer prevention trials P 1 and P 2 to determine their relationship to invasive and non invasive breast cancers; An analysis of the SNP CYP2D6, which affects tamoxifen metabolism to change the drug to its active form, to determine if it has an effect on prevention; An exploration of mammogram density as a risk factor for breast cancer, so that the measure may augment the Gail model risk score to better define breast cancer risk; and A study of sera from BCPT to look at Vitamin D, insulin, and related markers as breast cancer risk factors