J Hopkins study of 524 myositis-specific Ab positive pts shows that while 91% met 2017 EULAR/ACR criteria for Dx of myositis, 20% of HMGCR+ & 50% anti-PL7 did not classify as myositis; ~10% anti-SRP & HMGCR were dx as inclusion body myositis https://t.co/jcIn6SzbGG