Renal Recovery for Patients with ANCA-Associated Vasculitis and Low eGFR in the ADVOCATE Trial of Avacopan

Introduction: In the 330-patient ADVOCATE trial of avacopan for the treatment of antineutrophil cytoplasmic autoantibody (ANCA)-associated vasculitis, in which 81% of patients had renal involvement, estimated glomerular filtration rate (eGFR) increased on average 7.3 ml/min per 1.73 m² in the avacopan group and 4.1 ml/min per 1.73 m² in the prednisone group (P = 0.029) at week 52. This new analysis examines the results in the patient subgroup with severe renal insufficiency at enrollment into the trial, i.e., eGFR ≤20 ml/min per 1.73 m². Methods: eGFR was determined at baseline and over the course of the trial. Changes in eGFR were compared between the 2 treatment groups. Results: In ADVOCATE, 27 of 166 patients (16%) in the avacopan group and 23 of 164 patients (14%) in the prednisone group had a baseline eGFR ≤20 ml/min per 1.73 m². At week 52, eGFR increased on average 16.1 and 7.7 ml/min per 1.73 m² in the avacopan and prednisone groups, respectively (P = 0.003). The last eGFR value measured during the 52-week treatment period was ≥2-fold higher than baseline in 41% of patients in the avacopan group compared to 13% in the prednisone group (P = 0.030). More patients in the avacopan group versus prednisone group had increases in eGFR above 20, 30, and 45 ml/min per 1.73 m², respectively. Serious adverse events occurred in 13 of 27 patients (48%) in the avacopan group and 16 of 23 patients (70%) in the prednisone group. Conclusion: Among patients with baseline eGFR ≤20 ml/min per 1.73 m² in the ADVOCATE trial, eGFR improved more in the avacopan group than in the prednisone group.