Systematic review of plasma exchange (PE) in myositis (IIM) - 35 studies (mostly observational), 473 IIM pts (361 Rx w/ PE). Many reported improvements (publication bias). 7 comparative RCTs show no mortality benefit (severe ILD) (RR 0.41, 95% CI 0.16–1.06, I2 = 70%) https://t.co/ox0pdUL3Ek