Rretroperitoneal fibrosis Tx is fraut-steroids, tamoxifen, MMF, B cell therapy? OL trial in 8 RPF pts used steroids & mTOR inhibitor sirolimus (2mg/d x 3d; 1mg/d); 12 & 48wks - decr in fibrous tissue 50%, ESR 70%, IgG4 50% w/ normalized renal funct. https://t.co/9BJchCctDi