Effectiveness and safety of belimumab in Chinese adult lupus nephritis patients: a 24-week retrospective single-center real-world study

Objective To explore the effectiveness and safety of belimumab in Chinese adult lupus nephritis (LN) patients under a real-world setting. Methods For this retrospective cohort study, 30 LN patients received belimumab plus standard of care (SoC) due to a new onset or a relapse of LN from June 2021 to December 2022. And 30 matched patients only treated with SoC after propensity score matching (PSM) at the same period were also enrolled. After 24-week follow-ups, renal complete remission (CR), disease activity index, 24 h urine protein level, dose of prednisone and incidence of adverse events were compared. Results No statistically significant differences existed in baseline demographics, complement C3/C4, anti-dsDNA autoantibody titer, 24 h urine protein level or disease activity index. At Week 24, 21/30 patients achieved renal CR and it was higher than that of SoC group (21 vs 12, P=0.037). As compared with SoC group, belimumab group had lower levels of 24 h urine protein[346.50(183.75，571.00) mg vs 611.50(360.00，1450.00) mg], SLEDAI-2K (SLE disease activity index, SLEDAI-2K) score[(3.93±2.79) vs (5.70±3.14)] and daily prednisone dose [(11.67±4.34) mg/d vs (22.42±9.23) mg/d](P＜0.05). Furthermore, the incidence of adverse events between two group was comparable (P>0.05). Conclusions Belimumab plus SoC may alleviate LN, boost the rate of renal CR, lower 24 h urine protein levels, improve disease activity and reduce the intake of prednisone.