
This study investigated the effects of occupational and hobby exposures to silica, solvents, and heavy metals on idiopathic inflammatory myopathy (IIM) phenotypes, including dermatomyositis (DM), polymyositis (PM), inclusion body myositis (IBM), lung disease plus fever or arthritis (LD+), and overlap myositis (OM). Data from 1,390 patients revealed that high silica exposure was associated with increased odds of DM, LD+, and OM. Moderate to high heavy metals exposure was linked to greater odds of LD+ and OM. Smokers with high silica exposure had significantly higher odds of LD+, indicating joint effects. These findings emphasize the role of environmental exposures in influencing IIM phenotypes.
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