Ro52 Abs in idiopathic inflammatory myopathies (IIM). From 2,126 IIM China/Japan pts, Ro52 positivity was common (46%), esp in MDA5+ DM & anti-synthetase syndr (ASyS) & was assoc w/ high freq of ILD, rapidly progressive ILD, and poor prognosis. https://t.co/may6ZTJkvt https://t.co/EuinNbZUm7