OL study of 60 pts w/ new idiopathic retroperitoneal fibrosis (GFR >30) Rx w/ low dose MTX+pred VS Pred only. @ 9 mos remission: 90% MTX+Pred vs 81% Pred (noninferior). Time-to-remission, RPF thickness & relapses were same; but pred use was lower w/ MTX+pred (p < 0.001) https://t.co/13cjnl4Ke4