‘Important study’
“This important study supports that the presence of cortical lesions at the time of diagnosis is associated with long-term disability and transition to a secondary progressive disease course,” said Elias S. Sotirchos, MD, assistant professor of neurology at Johns Hopkins University, Baltimore. The study size and long duration of follow-up are important strengths of the findings, he added.
Still, further research is needed to validate cortical lesions as a biomarker in clinical practice. Aside from technical validation issues relating to the identification of cortical lesions, whether cortical lesion burden can be used to guide therapeutic decision-making in MS is not clear, said Dr. Sotirchos.
“Notably, these patients were diagnosed and enrolled in this study 20 years ago, prior to the availability of newer disease-modifying therapies [DMTs] that are more effective at preventing inflammatory disease activity in MS,” he said, referring to the participants in the current study.
While recent observational studies have suggested that early initiation of higher-efficacy disease-modifying therapies (DMTs) may reduce long-term disability and risk for transition to secondary progressive MS, the optimal approach to treatment in patients with a new diagnosis remains unclear, said Dr. Sotirchos.
Furthermore, it is unknown whether use of higher-efficacy DMTs may affect the risk of future disability in patients with high cortical lesion burden at baseline, said Dr. Sotirchos. “Or is it too late, especially considering the modest effects of DMTs in progressive patients and that cortical lesion burden was higher in patients that are progressive?”
One additional question to be addressed is how baseline cortical lesion burden adds to other factors that neurologists use in clinical practice to stratify patients’ risk of future disability, such as spinal cord involvement, motor or sphincter symptoms at onset, poor recovery from attacks, and white matter lesion burden, said Dr. Sotirchos.
The source of funding for this study was not reported. Dr. Schiavi and Dr. Sotirchos have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.