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Ontario Cancer Facts

Ovarian Cancer Survival Has Increased in Ontario among Most Age Groups

Sep 2016

Highlights

  • In Ontario, the 5-year relative survival ratio for women ages 15 to 74 improved significantly from 1983–1987 to 2008–2012.
  • Age is an important predictor of ovarian cancer survival because treatment plans and outcomes are different for each age group.
  • Women diagnosed with ovarian cancer have a better chance of surviving than ever before as a result of improved detection and treatment practices.

From 1983–1987 to 2008–2012, there was a significant increase in the 5-year relative survival ratio (RSR) for women ages 15 to 74 diagnosed with ovarian cancer. The greatest improvement was seen in women ages 45 to 54. Their RSR rose from 46.1% in 1983–1987 to 64.3% in 2008–2012, which means that they were estimated to be 64.3% as likely to survive for another 5 years as women of a similar age in the general population.

 

 

* Significantly higher five-year RSR in 2008–2012 than in 1983–1987.
Source: Ontario Cancer Registry, 2015 (Cancer Care Ontario)
Notes: Complete survival was used for the 2008–2012 time period, the cohort method was used for the 1983–1987 time period.

Ovarian cancer five-year relative survival ratios (RSR), by age goup, Ontario, 1983–1987 and 2008–2012
Age group 1983-1987: RSR (%) 1983-1987: 95% LCL 1983-1987: 95% UCL 2008-2012: RSR (%) 2008-2012: 95% LCL 2008-2012: 95% UCL
15-44 69.6 65.2 74.5 78.2* 73.9 81.9
45-54 46.1 41.6 50.5 64.3* 60.4 68
55-64 35.1 31.8 38.4 51.1* 47.4 54.7
65-74 24.5 21.4 27.7 37.3* 33.3 41.4
75-99 16.9 13.7 20.1 21.5 18.3 24.9

Relative survival also significantly increased in women ages 15 to 44 diagnosed with ovarian cancer (by 8 percentage points), as well as in women ages 55 to 64 (by 16 percentage points) and in women ages 65 to 74 (by 12 percentage points). Women ages 75 to 99 had the lowest 5-year RSR in 2008–2012; although their RSR increased, it did not change significantly from 1983–1987.

 

It is important to understand ovarian cancer survival by age group because age guides appropriate treatment plans and remains a strong predictor of survival.Younger women are more likely to be diagnosed early and respond well to treatment, while older women are more likely to have other health conditions (e.g., heart disease, diabetes) that affect their treatment plan and likelihood of treatment complications.

 

Although ovarian cancer is often diagnosed at advanced stages, particularly in older women, new detection and treatments of this disease, including chemotherapy regimens and delivery, genetic screening and advanced surgical techniques, have led to an increase in ovarian cancer survival. However, the overall age-standardized 5-year RSR for ovarian cancer is still relatively low at 42.0% (2008–2012).

 

Ovarian cancer is the 8th most common cancer among women in Ontario and poses a unique burden because most cases are found at advanced stages when they are harder to treat. Common risk factors for ovarian cancer include family history of the disease, never being pregnant, personal history of breast cancer, tobacco use, obesity and use of hormone replacement therapy. Approximately 1 in 60 women living in Ontario will be diagnosed with ovarian cancer in their lifetime.