printemailclick to share buttonfacebooktwitterlinkedin
OBSP Screening for Women at High Risk

The Ontario Breast Screening Program (OBSP) screens women at high risk for breast cancer. There is evidence that annual screening with breast magnetic resonance imaging (MRI) in addition to mammography (MM) benefits women at high risk.

The introduction of combined MM/MRI screening into the OBSP for women aged 30 to 69 who are at high risk for breast cancer will improve their quality of care, ensuring that they receive the benefits of screening and promoting the early detection of breast cancer.

Who is eligible for high risk breast cancer screening?

Quick Facts

Less than 1% of women in the general population are estimated to be at high risk for breast cancer.

Women at high risk have a greater estimated lifetime risk of developing breast cancer (up to 85%) than the general population (10-12%).

Women at high risk develop breast cancer at an earlier age and their breast cancers tend to be more aggressive than breast cancers diagnosed in women at average risk.

Women are eligible for the OBSP's high risk screening program if they have no acute breast symptoms, are 30 to 69 years of age and meet one of the following risk criteria:

  • Are known to be carriers of a deleterious gene mutation (e.g., BRCA1, BRCA2)
  • Are the first degree relative of a mutation carrier (e.g., BRCA1, BRCA2) and have declined genetic testing
  • Are determined to be at ≥ 25% lifetime risk of breast cancer -- must have been assessed using either the IBIS or BOADICEA risk assessment tools, at a genetics clinic
  • Have received chest radiation treatment (not chest x-ray) before age 30 and at least 8 years previously.

Where to get high risk breast cancer screening

OBSP High Risk Screening Sites

Local Health Integration Network (LHIN)
Referral Contact
Fax Partner Testing Sites
Erie-St. Clair

Chatham-Kent Health Alliance 519-352-6400 x 6563 519-437-6040 Chatham-Kent Health Alliance (Chatham)

Erie-St. Clair

Windsor Regional Hospital
519-253-3191 x 52546 519-255-8688 Windsor Regional Hospital, Metropolitan site
Windsor Regional Hospital, Ouellette Campus
South West

South West Regional Cancer Program 519-685-8600 x 54926
1 800-461-0640
519-432-0271 St. Joseph’s Health Care (London)

South West

Grey Bruce Health Services
519-376-2121 x 2116
Grey Bruce Health Services (Owen Sound)
Waterloo Wellington Waterloo Wellington Cancer Program
519-749-4300 x 3544 519-749-4232 Grand River Hospital (Kitchener)
Hamilton Niagara Haldimand Brant Hamilton Health Sciences Corporation - Juravinski Hospital 905-521-2100 x 42497 905-575-6316 Hamilton Health Sciences Corporation, Juravinski Hospital
St Joseph’s Healthcare Hamilton, Charlton Site
Niagara Health System, St. Catharines General Hospital
Central West William Osler Health Centre 905-494-6628 905-494-6524 William Osler Health Centre – Brampton
William Osler Health Centre – Etobicoke
Mississauga Halton Trillium Health Partners; Credit Valley Hospital 905-813-4154 905-813-4155 Trillium Health Partners; Credit Valley Hospital (Mississauga)
Toronto Central
St Michael's Hospital (Toronto)
416-864-6040 416-864-5788 St. Michael’s Hospital (Toronto)
Toronto Central
Sunnybrook Health Sciences Centre 416-480-5000 x 7938 416-480 4676 Sunnybrook Health Sciences Centre (Toronto)
Toronto Central
Princess Margaret Hospital 416-946-4501 x 6313 416-946-4500 Princess Margaret Hospital (Toronto)
Toronto Central
Women’s College Hospital 416-323-6358 416-323-6370 Women’s College Hospital (Toronto)
Toronto Central
Mount Sinai Hospital 416-586-4422 416-586-4714 Mount Sinai Hospital (Toronto)
Central Markham Stouffville Hospital 905-472-7373 x 6881 905-472-7613 Markham Stouffville Hospital (Markham)
Central North York General Hospital, Branson Division
416-632-8748 416-635-2538 North York General Hospital, Branson Division
Central East Lakeridge Health Corporation 905-576-8711 x 6413 905-721-4802 Lakeridge Health Corporation, Oshawa site
Central East Peterborough Regional Health Centre
705-740-8166 x 2691 705-740-8167 Peterborough Regional Health Centre
Central East Rouge Valley Health System - Centenary
416-284-8131 x 5329 (416) 284-3101 Rouge Valley Health System - Centenary (Toronto)
Central East Ross Memorial Hospital 705-324-6111 x 4433 705-328-6188 Ross Memorial Hospital (Kawartha Lakes)
South East High Risk OBSP Program South East Regional Cancer Program (613) 549-6666 x 7336 (613) 548-1302 Kingston General Hospital
Champlain The Ottawa Hospital Regional OBSP High Risk Centre 613-761-4552 613-728-6333 The Ottawa Hospital, Civic Campus
North Simcoe Muskoka Royal Victoria Regional Health Centre
705-728-9090 x 43422 705-719-4935 Royal Victoria Regional Health Centre (Barrie)
North East Timmins & District Hospital 705-360-6012 705-360-6681 Timmins and District Hospital
North East Sault Area Hospitall
705-759-3434 x 4278 705-759-3663 Sault Area Hospital (Sault Ste. Marie)
North East

Health Sciences North

705-523-7100 x 2410


Health Sciences North (Sudbury)

North West
Thunder Bay Regional Health Sciences Centre 807-684-7777 807-345-6602 Thunder Bay Regional Health Sciences Centre
Last modified: Thu, Mar 23, 2017
cancer care ontario | action cancer ontario   620 University Avenue Toronto Ontario, Canada M5G 2L7   Phone: 416.971.9800 Fax: 416.971.6888

Please help improve the quality of our website by answering 10 brief questions in our online survey. Would you like to participate?