For the current analysis, they wanted to assess treatment effect on heavy fatigue, a common occurrence in MS. In fact, fatigue is reported by up to 92% of patients with MS, "with over half of them saying it's one of their worst symptoms, in addition to motor disability," said Dr Bose.
"Fatigue is something that isn't as well measured, so we wanted to see if this type of transplant, which has such astounding impact on patient inflammation and lesions on MRI, has any role in patient fatigue as well," he added.
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When asked for comment, ACTRIMS President-Elect Jeffrey A. Cohen, MD, Cleveland Clinic Neurological Institute–Mellen Center, Ohio, told Medscape Medical News that "there's been an increasing interest" in aHSCT as a treatment for aggressive MS that hasn't responded to other therapies.
"This group previously reported very potent efficacy. There were some significant safety concerns but mostly they were front-loaded and decreased over time," he said.
"People are not going to pursue transplant to treat fatigue in MS, but this is a useful observation and underscores the potential efficacy," added Dr Cohen. "And it might give us some insights into the mechanisms that cause fatigue in MS."
He noted that one theory has been that fatigue is caused by ongoing, overactive inflammation. "So suppression of that could lead to less fatigue."
Or it could be caused by the increased work of carrying out activities of daily living. "So a functional benefit of the transplant, improving disability, may be what decreases fatigue," he speculated.