Objective: To conduct a population-based study of incidence and screening rates for secondary breast and colorectal cancers after endometrial cancer and to assess implications for follow-up.
Methods: This was a retrospective population-based study from administrative databases. The inception cohort included all women diagnosed with endometrial cancer in Ontario, Canada from 1996 to 2000, without a previous history of breast or colorectal cancer. We ascertained 5-year recurrence and overall survival rates and practitioner type during follow-up. Primary outcomes were age-standardized incidence and screening rates of breast and colorectal cancer during follow-up compared with the general female population.
Results: There were 3,473 women in the cohort. The 5-year recurrence rate was 15.0% and overall survival was 79.3%. Family physicians were most often involved in follow-up care. Age-standardized incidence rates of breast and colorectal cancer were 0.5% and 0.7%, respectively, compared with 0.5% (P=.76) and 0.2% (P<.001) in the general population. Age-standardized screening rates for these cancers were 64.0% and 30.0%, respectively, compared with 31.0% (P<.008) and 15.0% (P<.001) in the general population. Women aged older than 70 years and those with the lowest income were least likely to have secondary cancer screening.
Conclusion: Women with endometrial cancer have a comparable risk of breast cancer but higher risk of colorectal cancer compared with the general population. Follow-up after endometrial cancer should include counseling and uptake of secondary cancer prevention strategies, which will contribute to maximizing long-term survivorship for these women.
Level of evidence: II.