Safe Effective Therapy With Low-Dose Glucocorticoid in ANCA-Associated Vasculitis (SAFE-LOW)

ANCA-associated vasculitis (AAV) is an auto-immune disease which often involves the kidneys. It is a serious condition as it can lead to severe kidney impairment, often kidney failure, and may even be life-threatening. Current treatments, typically cyclophosphamide (CYC) or rituximab (RTX) with a tapering course of glucocorticoids (GC), allow most patients to achieve control of their disease (remission). Glucocorticoids are most often used initially at high doses, and then gradually decreased to low doses over at least 6 months. This leads to major treatment toxicities, notably infections and GC-related adverse events, major contributors to patient morbidity and mortality. Recent research has focused on finding ways to reduce treatment-related toxicities without compromising efficacy for controlling disease manifestations. This includes a reduced-dose GC taper for severe AAV from the Plasma Exchange and Glucocorticoids in Severe ANCA-Associated Vasculitis (PEXIVAS) trial, an even more reduced-dose GC taper in patients with moderate severity AAV from the Effect of Reduced-Dose vs High-Dose Glucocorticoids Added to Rituximab on Remission Induction in ANCA-Associated Vasculitis (LOVAS) trial, and a novel GC-sparing agent examined in the Avacopan for the Treatment of ANCA-Associated Vasculitis (ADVOCATE) trial. Despite these advances, patients still experience high rates of infections, one of the major causes of death in the first year after diagnosis, particularly in patients with most severe forms of disease. Also, novel GC-sparing drugs are costly and have limited availability throughout the world; patients who cannot access this get exposed to significant amounts of GC and must suffer their dreaded side effects. This study addresses the unresolved issues of unacceptably high infection risk and of providing a widely available means of reducing GC exposure to minimise treatment side effects. The investigators will examine an induction treatment regimen for severe AAV consisting of 2 doses of IV CYC in combination with 4 weeks of GC and standard RTX. The control arm will be the current standard of care treatment for severe AAV. Non-controlled studies suggest the use of short duration CYC with RTX allows for minimisation of up-front GC use, as little as 1-2 weeks, but this needs to be tested in a prospective, controlled manner. The investigators hypothesize that the combination of CYC with standard RTX will allow less GC to be used for AAV. This study will begin as a pilot to examine the feasibility of the conducting the study, adherence to the intervention regimen, and of recruiting patients. If feasibility is demonstrated, the study will be extended to a full-scale trial.