4.3 Article

Cancer related mortality in multiple sclerosis. A population based cohort study

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ELSEVIER SCI LTD
DOI: 10.1016/j.msard.2022.104417

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Multiple sclerosis; Cancer; Mortality; Cohort study

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This study aims to determine the differences in all-cause mortality and mortality following a cancer diagnosis between multiple sclerosis (MS) patients and matched population controls. The study found that the all-cause mortality among MS patients was five times higher than that of the controls, and the mortality following a cancer diagnosis was two times higher. In addition, MS patients had higher mortality rates following urinary system, colorectal, hematological, ovarian, and breast cancer diagnoses. High education was inversely associated with mortality among MS patients.
Background: Cancer is a major cause of death, but how cancer influences mortality risk in Multiple Sclerosis (MS) is unclear. Objectives: Determine all-cause mortality and mortality following a cancer diagnosis among MS patients compared with matched population controls. Methods: Norwegian MS patients born 1930 - 1979 (n= 6950) followed-up 1953 - 2016, were matched with 37 922 controls. We compared incident cancer diagnosis from the Cancer Registry of Norway, date of death from the Cause of Death Registry, education from the National Education Database, by multivariate Cox proportional hazard regression.Results: Hazard ratio (HR) and 95% confidence interval (CI) for all-cause mortality among MS patients was 4.97 (4.64 - 5.33), and 2.61 (2.29 - 2.98) for mortality following a cancer diagnosis. Mortality in MS was highest following urinary- (2.53: 1.55 - 4.14), colorectal- (2.14: 1.47 - 3.11), hematological- (1.76: 1.08 - 2.88), ovarian - 2.30 (1.73-3.06) and breast cancer diagnosis (2.61: 1.85 - 3.68), compared to controls. High education was inversely associated with mortality among MS patients.Conclusions: All-cause mortality was five- fold and mortality following a cancer diagnosis was two- fold increased among MS patients. Mortality following specific cancers raises the possibility of diagnostic neglect.

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