MPO and rapidly progressive glomerulonephritis: In terms of the initial treatment data for MPO-ANCA-positive RPGN, the rates of GC (100% vs. 97.5%) and GC pulse (57.4% vs. 61.3%) were similar between CS2 and the questionnaire survey, while the rates of IVCY (3.2% vs. 14.4%) and RTX (3.2% vs. 9.5%) were statistically significant lower in CS2.