Efectiveness of belimumab in the treatment of lupus nephritis: analysis of 8 cases. / Efectividad de belimumab en el tratamiento de la nefritis lúpica: análisis de 8 casos.

ABSTRACT

INTRODUCTION AND OBJECTIVE: Belimumab is a monoclonal antibody targeting BLyS approved for Systemic Lupus Erythematosus (SLE), with recent indication for lupus nephritis (LN). To analyze effectiveness of Belimumab in LN patients. METHODS: Retrospective and cross-sectional study including SLE patients (SLICC/ACR 2012 criteria) with LN demonstrated by kidney biopsy, treated with Belimumab. A clinical history review was made and serological data, kidney function and urine sediment were collected. RESULTS: Eight patients with LN demonstrated by kidney biopsy were included. Median age was 37.56 (7.03) years, with 15.13 (8.71) years since SLE diagnosis was made and 4.61 (2.64) years since onset of belimumab. Proteinuria was reduced to normal values in 6 patients, and renal function was stable from the beginning of treatment in all cases. There was a reduction in the anti-DNA level and normalization of complement in those cases in which it was reduced. One patient presented an increase in anti-DNA titer, with normal complement. CONCLUSIONS: In clinical practice, belimumab can improve LN in terms of serological activity, kidney function and urine sediment.