Overall
By Age Group
Cancer incidence data are derived from the Ontario Cancer Registry (OCR) operated by Cancer Care Ontario. The OCR contains information on Ontario residents who have been newly diagnosed with all types of malignant cancers, with the exception of basal cell and squamous cell (non-melanoma) skin cancers. Cancer sites were coded using the Third Edition of the International Classification of Diseases for Oncology (ICDO-3). Beginning in 2014, the OCR adopted the National Cancer Institute (NCI) SEER standards for counting multiple primaries for cancer cases diagnosed in 2010 and beyond. This standard is more liberal than the previously used case counting rules from the modified version of the International Association of Cancer Registries (IACR). Cancer incidence data presented on this and other HealthSTATS pages reflect the new rules for counting multiple primary cancers. To ensure consistent interpretation of trends, cancer incidence data will only be presented from 2010 onward on all HealthSTATS pages.
Overall
The rate of new cancer cases (also called the incidence rate) provides a measure of the risk of developing cancer over a given period of time. In 2018 among female residents of Simcoe Muskoka, there were close to 500 new cases of breast cancer diagnosed for an age-standardized incidence rate of 143 (130.5, 156.7) new cases per 100,000. This was similar to the Ontario female breast cancer incidence rate of 147 (144.7, 150.1) new cases per 100,000. Breast cancer is the leading cause of new cancer cases among females in both Simcoe Muskoka and Ontario. The female breast cancer incidence rates both in Simcoe Muskoka and Ontario did not change significantly from 2010 to 2018.
By Age Group
The risk of being diagnosed with breast cancer for a female increases significantly with age. The age-specific breast cancer incidence rates between 2010 and 2018 (combined) in Simcoe Muskoka were highest among seniors 65 years of age and older. The age-specific female breast cancer incidence rates in Simcoe Muskoka were not significantly different from the comparable provincial rates for all age groups among adults 20 years of age and older.
