35 SLE pts Rx w/ RTX x 3 ys-anti-RTX antibodies found @3 yrs in 64%, higher if previously RTX treated (vs naive). ADA+ had signif lower median RTX levels at 6 mos (P = 0.0018) and increased relapse rates. In vitro showed neutralizing capacity these Abs https://t.co/oV7nHxiS4s https://t.co/p55MvcLDFn