Cool talk by P Grayson - how to design ANCA vasculitis RCTs with biomarkers, umbrella/basket RCT designs to treat pts MORE likely to respond. Also for an individual, following ANCA is not that helpful for altering Rx Take a look at this session GS401 #ACR21 #ACRBest @RheumNow https://t.co/nrapO9i4gw