PO.6.126 Anti-rituximab antibodies demonstrate neutralising capacity, associate with lower circulating drug levels and early relapse in patients undergoing treatment for systemic l... oleh N Kharlamova, D Isenberg, N Dunn, A Fogdell-Hahn, C Wincup, E Jury, C Ciurtin, C Ruetsch-Chelli, A Manouchehrinia, M Naja, B Seitz-Polski