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We read with interest the study by Fois and colleagues, showing no change in the risk of cancer in multiple sclerosis (MS) patients compared with the normal population.1 However, we note that a previous study published this year suggested that MS patients are at lower risk of cancer than the normal population.2 Resolving this controversy is of huge importance for patients and perhaps also for assessing potential adverse effects of immunomodulatory therapies for MS.3
These recent reports, utilising powerful population-based registries, have both shown a decreased risk for all cancers in MS patients, with statistical significance achieved in one study2 but not in …
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