In ANCA-associated vasculitis, does reverse seroconverting (ANCA+➡️ANCA-) make a difference? relapse - no ESRD - no death - no Don't measure serial ANCAs for prognosis (no diff MPO/PR3, RTX/CYC) target trial emulation @BrighamWomens @MGHrheumatology #ACR21 ABST0419 @RheumNow https://t.co/rLkTY0ul8f