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. 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 data presented on this and other HealthSTATS pages only includes cases captured using the more conservative IACR definition for all years in order to maintain comparability over time. As a result, figures presented on HealthSTATS may be lower than those reported by Cancer Care Ontario as they are using the revised counting methodology.
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 2012 among Simcoe Muskoka female residents, there were over 400 new cases of breast cancer diagnosed with an age-standardized incidence rate for females of all ages of 110 (98.9, 121.6) per 100,000 population. This was not significantly different from the Ontario female breast cancer incidence rate of 99 (97.1, 101.4) per 100,000. Breast cancer is the leading cause of new cancer cases among females in both Simcoe Muskoka and Ontario.
Figure one below shows the trend in breast cancer incidence in both Simcoe Muskoka and Ontario over the twenty-seven year period from 1986 to 2012. The female breast cancer incidence rates both in Simcoe Muskoka and Ontario have not changed significantly over this time period.
By Age Group
The risk of being diagnosed with breast cancer for a female increases significantly with age (see figure two). The age-specific breast cancer incidence rates between 2007 and 2012 (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. Figure Two