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Breast Cancer Screening for Women at High Risk

The Ontario Breast Screening Program (OBSP) screens women ages 30 to 69 at high risk for breast cancer, with annual breast mammography and magnetic resonance imaging (MRI) (or, if MRI is not medically appropriate, screening breast ultrasound). This kind of testing is based on scientific evidence and ensures that high risk women receive the benefits of organized screening.

Who Is Eligible?

Women ages 30 to 69 are eligible for screening mammography and screening breast magnetic resonance imaging (MRI) (or, if MRI is not medically appropriate, screening breast ultrasound) every year at High Risk OBSP sites, if they have:

  • a physician referral
  • a valid Ontario Health Insurance Plan number
  • no acute breast symptoms and meet one of the following risk criteria:
    • Known to be a carrier of a gene mutation (e.g. BRCA1, BRCA2)
    • First-degree relative of a mutation carrier (e.g. BRCA1, BRCA1), has had genetic counselling and has declined genetic testing
    • Assessed by a genetic clinic (using the IBIS or BOADICEA tools) as having a ≥25% personal lifetime risk of breast cancer based on family history
    • Received radiation therapy to the chest (not X-ray) before age 30 and at least 8 years ago