Background and Objectives — We tested the hypothesis that overall and cancer-specific survival following colorectal cancer diagnosis is lower in persons with multiple sclerosis (MS) than without MS, using a retrospective matched cohort design.
Methods — Using population-based administrative data in Manitoba and Ontario we identified persons with MS using a validated case definition, and linked these cohorts to cancer registries to identify those with colorectal cancer. We selected persons with colorectal cancer and without MS matching 4:1 on birth year, sex, cancer diagnosis year and region. We used Cox proportional hazards regression to compare all-cause survival between cohorts adjusting for age at cancer diagnosis, cancer diagnosis year, income, region, and Elixhauser comorbidity score. We compared cancer-specific survival between cohorts using a cause-specific hazards model. We pooled findings across provinces using random-effects meta-analysis. Complementary analyses using a subcohort from Ontario adjusted for cancer stage and disability status, as measured based on the use of home care or long-term care services.
Results — We included 338 MS cases and 1352 controls with colorectal cancer. The mean (SD) age at cancer diagnosis was 64.7 (11.1) years. After adjustment, MS was associated with an increased hazard for all-cause death which was highest six months post-diagnosis (hazard ratio [HR] 1.45; 95%CI: 1.19-1.76), then declined over time (HR [95%CI] 1 year: 1.34 [1.09-1.63], 2 years: 1.24 [0.99-1.56]; 5 years: 1.10 [0.80-1.50]). MS was associated with increased cancer-specific death at 6 months post-diagnosis only (HR 1.29; 95%CI: 1.04-1.61). After adjusting for cancer stage, MS was associated with an increased hazard of death due to any cause (1.60; 95%CI: 1.16, 2.21) and with cancer-specific death (HR 1.47; 95%CI: 1.02, 2.12). The association of MS and all cause death was partially attenuated after adjustment for disability status (HR 1.37; 95%CI: 0.97, 1.92), as was the association with cancer-specific death (HR 1.34; 95%CI: 0.91, 1.97).
Discussion — Overall and cancer-specific survival was lower in persons with than without MS in the early period following colorectal cancer diagnosis. Further study is warranted to determine what factors underlie these worse outcomes.
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