NCRI phase II study of CHOP in combination with ofatumumab in induction and maintenance in newly diagnosed Richter syndrome by Eyre, T, Clifford, R, Bloor, A, Boyle, L, Roberts, C, Cabes, M, Collins, G, Devereux, S, Follows, G, Fox, C, Gribben, J, Hillmen, P, Hatton, C, Littlewood, T, Mccarthy, H, Murray, J, Pettitt, A, Soilleux, E, Stamatopoulos, B, Love, S, Wotherspoon, A, Schuh, A