Session Type: ACR Plenary Session
Session Time: 11:00AM-12:30PM
Once ANCA-associated vasculitis (AAV) remission was obtained, rituximab (RTX) superiority to azathioprine (AZA) to maintain remission was shown.1 In that study, at month 28, only 5% of RTX recipients vs 29% taking AZA suffered major relapses. However, at present, neither ANCA-positivity and/or titers (status) nor peripheral blood CD19 B-cell–detection are considered reliable AAV-relapse predictors. The MAINRITSAN2 trial (ClinicalTrials.gov, no. NCT01731561) was designed to evaluate RTX infusions individually tailored to ANCA status and/or circulating CD19 B-cell reappearance to maintain AAV remission.
Patients with granulomatosis with polyangiitis (GPA) or microscopic polyangiitis (MPA) in complete remission after induction therapy (glucocorticoids and cyclophosphamide, rituximab or methotrexate) were included in an open-label, multicenter, randomized–controlled trial to compare RTX regimens: given according to ANCA status and/or circulating CD19 B-cell reconstitution vs systematically infused (controls). The experimental arm received fixed, 500-mg RTX infusions on day-0 postrandomization, then every 3 months until month 18, when CD19 lymphocytes exceeded 0/mm3 or ANCA status (reappearance)/titer (higher) differed from the previous determination. Controls received 500 mg of RTX on days 0 and 14 postrandomization, then 6, 12 and 18 months after the first infusion. The primary endpoint was the number of relapses (new or reappearing symptom or worsening disease with BVAS>0) at month 28, as assessed by an independent Adjudication Committee blinded to treatment arms.
Results: The 162 patients included [117 (72.2%) GPA and 45 (27.8%) MPA] were equally allocated to the experimental (n=81; 50%) and control (n=81; 50%) groups. Prerandomization induction therapy was cyclophosphamide for 100 (61.7%) patients, RTX for 61 (37.7%) or methotrexate for 1 (0.6%). Median RTX-infusion numbers were: 3 (interquartile range (IQR) 2–4) for the experimental arm and 5 (IQR 5–5) for controls. Twenty-one (13%) patients suffered 22 relapses: 14 (17.3%) in 13 experimental arm patients and 8 (9.9%) in 8 controls (P=0.22). The relapse-free–survival rate was 83.8% (95% confidence interval [CI], 76.1–92.3%) for the experimental arm and 86.4% (95% CI, 79.2–94.2) for controls (P=0.58). Twenty-six (32.1%) experimental arm patients experienced at least 1 severe adverse event vs 31 (38.3%) controls (P=0.51). Four patients died, 1 of an infectious complication. No association between ANCA status and/or circulating CD19 B cells and relapses was observed.
Conclusion: AAV-relapse rates for patients given individually tailored or systematic RTX-infusion schedules did not differ significantly. However, ANCA and circulating CD19 B cells could be considered useful tools to decide to reinfuse because they achieved lower RTX total doses (i.e., 3 vs 5 infusions) to prevent relapses in the experimental arm.
1Guillevin L et al. N Engl J Med 2014;371:1771–80.
To cite this abstract in AMA style:Charles P, Terrier B, Perrodeau E, Cohen P, Faguer S, Huart A, Hamidou M, Agard C, Bonnotte B, Samson M, Karras A, Jourde-Chiche N, Lifermann F, Gobert P, Hanrotel-Saliou C, Godmer P, Martin Silva N, Pugnet G, Matignon M, Aumaître O, Lazaro E, Puéchal X, Ravaud P, Mouthon L, Guillevin L. Comparison of Individually Tailored Vs Systematic Rituximab Regimens to Maintain ANCA-Associated Vasculitis Remissions: Results of a Prospective, Randomized–Controlled, Phase 3 Trial [abstract]. Arthritis Rheumatol. 2017; 69 (suppl 10). https://acrabstracts.org/abstract/comparison-of-individually-tailored-vs-systematic-rituximab-regimens-to-maintain-anca-associated-vasculitis-remissions-results-of-a-prospective-randomized-controlled-phase-3-trial/. Accessed June 3, 2020.
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