Phase 3 RCT shows that SC Abatacept was not effective in treating Active Idiopathic Inflammatory Myopathy: 148 (double-blind) & 133 (OL) pts Rx for 24wks with similar improvement 56% ABA vs 42.5% PBO (P = 0.083); NS at 52 wks & w/ dermatomyositis. https://t.co/InlHJSmiKn https://t.co/mtFQWp3vlb