NCI is collaborating with investigators in the Chinese University of Hong Kong to collect frozen and formalin-fixed paraffin-embedded (FFPE) tissues from Chinese women in Hong Kong who are participating in an ongoing breast cancer case-controls study. Detailed questionnaire and clinical data as well as blood and/or saliva are also being collected from up to 2,000 study participants. The goal of this study is to comprehensively characterize the molecular/genetic/epigenetic profile of breast cancer among Asian women.