Abstract
Background
Epidemiological, pathological and radiological studies suggest that inflammatory demyelination in MS is an age-dependent process, and that the formation of focal inflammatory demyelinating lesions decreases with age. Gadolinium-enhancing lesions are a biomarker of inflammatory disease activity in MS, but little is known about the relation of age and gadolinium enhancement on cranial MRI scans in people with MS. In this study, we investigated the association of age and other risk factors with gadolinium enhancement on cranial MRI in a retrospective cross-sectional clinical MS cohort.
Methods
In a cohort including 1543 people with CIS and MS, we investigated the association of the risk factors age, sex, disease course, immunomodulatory drug (IMD) treatment, and disability with gadolinium enhancement on cranial MRI scans using a binary logistic regression model.
Results
Age was the most important factor associated with gadolinium enhancement, with the odds of gadolinium enhancement decreasing with advancing age. Participants with CIS had lower odds of gadolinium enhancement (odds ratio of 0.42, 95% confidence interval of 0.24–0.72 compared to RRMS). Sex, disease course and IMD treatment were not significantly associated with gadolinium enhancement in our cohort.
Conclusions
Our investigation shows that gadolinium enhancement is strongly associated with age. Since gadolinium enhancement is a marker of inflammatory disease activity, our findings suggest that inflammatory disease activity declines with age, and that IMD treatment may be more beneficial in younger and less useful in older people with MS.
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Data availability
The longitudinal study we used for these analyses began in 2001, before it was common to share de-identified data. Therefore, unfortunately, we do not have patient consent or approval from our institutional research ethics board to share individual patient level data. Processes are underway to change this for future data collected.
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Dr. Koch reports personal fees and non-financial support from Biogen Idec, personal fees and non-financial support from EMD Serono, personal fees and non-financial support from Novartis, personal fees and non-financial support from Roche, and personal fees and non-financial support from Sanofi Genzyme. Dr. Mostert has nothing to disclose. Ms. Greenfield has nothing to disclose. Dr. Liu reports personal fees from EMD Serono, personal fees from Novartis, and personal fees from Sanofi Genzyme. Prof. Metz has nothing to disclose.
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All participants included in these analyses have given their written informed consent to participate in an ongoing longitudinal study of outcomes and predictors of MS, or a waiver of consent was provided by the University of Calgary’s Conjoint Health Research Ethics Board (CHREB). Ethical approval was granted by CHREB.
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Koch, M.W., Mostert, J., Greenfield, J. et al. Gadolinium enhancement on cranial MRI in multiple sclerosis is age dependent. J Neurol 267, 2619–2624 (2020). https://doi.org/10.1007/s00415-020-09895-0
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DOI: https://doi.org/10.1007/s00415-020-09895-0