Briefly, the Breast and Prostate Cancer Cohort Consortium(BPC3) is a consortium of breast cancer case-control sets nested in seven cohorts: the American Cancer Society Cancer Prevention Study II (CPS-II), the European Prospective Investigation into Cancer and Nutrition Cohort (EPIC), the Multiethnic Cohort (MEC), the Nurses’ Health Study I and II (NHS and NHSII), the Prostate, Lung, Colorectal, and Ovarian Cancer Screening Trial (PLCO), and the Women’s Health Study (WHS). But how to access this dataset.