Predictors of Long‐Term Renal Outcome in Lupus Nephritis Trials: Lessons Learned from the Euro‐Lupus Nephritis Cohort

This study demonstrates that the level of proteinuria at 12 months is the individual best predictor of long-term renal outcome in patients with lupus nephritis. Inclusion of urinary RBCs as part of a composite outcome measure actually undermined the predictive value of the trial data. We therefore suggest that urinary RBCs should not be included as a component of clinical trial response criteria in lupus nephritis.