Breast cancer

What is breast cancer?

Breast cancer starts in the cells of the breast. Learn about symptoms, screening, diagnosis, treatment and risks in our guide to breast cancer.

Risks for breast cancer

There are many risks for breast cancer, including a family history of cancer and having dense breasts. Learn about breast cancer risk in women.

Screening for breast cancer

Screening mammography helps find breast cancer before symptoms develop.

Symptoms of breast cancer

A lump in the breast is the most common first symptom of breast cancer. Learn about the symptoms of breast cancer.

Diagnosis of breast cancer

Diagnostic tests are done when symptoms or screening suggest a problem with the breast. Learn about tests used to diagnose and stage breast cancer.

Grading breast cancer

Grading breast cancer tumours is an important part in planning treatment and estimating prognosis. Learn about the grades of breast cancer and grading ductal carcinoma in situ (DCIS).

Stages of breast cancer

The stage of breast cancer describes the size of the tumour (T), if cancer is in the lymph nodes (N) and if it has spread or metastasized (M).

If breast cancer spreads

Cancer can spread from the breast to other parts of the body. This is called metastasis. Learn about common sites where breast cancer spreads.

Prognosis and survival for breast cancer

Prognosis estimates the outcome for breast cancer. Prognosis and survival depend on many factors, including the stage and grade of the cancer.

Treatments for breast cancer

Breast cancer can be treated with surgery, radiation therapy, hormone therapy, targeted therapy, immunotherapy and chemotherapy.

Breast reconstruction, prostheses and remaining flat

Breast reconstruction, breast prostheses and choosing to "remain flat" are all options once you've had surgery to remove breast cancer.

Supportive care for breast cancer

Supportive care helps people meet the physical, practical, emotional and spiritual challenges of breast cancer. It is an important part of cancer care. There are many programs and services available to help meet the needs and improve the quality of life of people living with cancer and their loved ones.

Breast cancer statistics

Cancer statistics tell us how many people in Canada are diagnosed with and die from breast cancer in a certain time frame.

Medical disclaimer

The information that the Canadian Cancer Society provides does not replace your relationship with your doctor. The information is for your general use, so be sure to talk to a qualified healthcare professional before making medical decisions or if you have questions about your health.

We do our best to make sure that the information we provide is accurate and reliable but cannot guarantee that it is error-free or complete.

The Canadian Cancer Society is not responsible for the quality of the information or services provided by other organizations and mentioned on, nor do we endorse any service, product, treatment or therapy.

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