Environmental and lifestyle factors relationships with MS not unique to relapsing-onset MS: 'factors affecting the risk of relapsing and progressive onset multiple sclerosis, by Hedstrom and colleagues

Here, Hedstrom and colleagues show that lifestyle/environmental/genetic relationships seen for relapsing-onset multiple sclerosis (MS) are also seen for progressive-onset MS

The aetiology of multiple sclerosis (MS) reflects a complicated interrelationship of environmental, lifestyle and genetic risk factors, each comprising a unique causal pie to realise disease in each patient. Of these factors, there is variable evidence in support of each, though some of the strongest and most consistent have been tobacco smoke,1 Epstein-Barr virus (EBV) exposure2 and the major histocompatibility locus, particularly the HLA-DRB1*15:01 allele,3 while less consistent evidence exists for factors including sun exposure/vitamin D,4 5 alcohol intake6 and BMI.7 In addition to exploring direct effects of these risk factors, the interaction between them, particularly gene–environment interaction, is of great interest as well as highly biologically plausible. A seminal publication by van der Mei et…

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