The absolute and relative numbers ( percentages ) of CD@ + B cells ( explanatory variables ) were measured longitudinally during @ months in @ patients randomized to receive either rituximab ( RTX ) or cyclophosphamide ( CYC ) followed by azathioprine ( AZA ) for the treatment of AAV ( Rituximab in ANCA-Associated Vasculitis -LSB- RAVE -RSB- trial ) .