This is the largest long-term study of women who carry a mutation in one of the two breast cancer genes (BRCA1/BRCA2). This study was started in 1995 by Dr. Steven Narod and now has upwards of 9,000 participants from across Canada, the United States, Europe, and Asia. Its purpose is to better understand the prevention and treatment of hereditary breast and ovarian cancers. We hope to gain a better understanding of the interaction between various hormonal, reproductive, and lifestyle factors that may be associated with the development of breast and ovarian cancer in high-risk families. Click here to view the Investigators Brochure.

Learn more about some of the important findings that have come from Dr. Narod's studies.

Who Can Participate?

• Participation in this study is completely voluntary.
• Women who have learned that they have a mutation in either the BRCA1 or BRCA2 gene are eligible to participate in this study, whether or not they have a personal history of cancer.
• Participants must be 25 years of age or older.

Why Should You Participate?

The risk of breast and ovarian cancer in carriers of BRCA1 or BRCA2 mutations is believed to be influenced by several genetic and non-genetic factors. A bigger study population will produce more accurate results, giving you an opportunity to make better decisions regarding your health.

What Does Participation Entail?

To participate, all we need you to do is to fill a questionnaire that asks questions about your health, menstrual cycle, lifestyle, etc. every two years. You may stop participation at any time. We estimate that the questionnaire could take about 30 minutes to complete.