P626: FUNCTIONAL SCREENING OF PI3K INHIBITORS STRATIFIES RESPONDERS TO IDELALISIB AND INDICATES DRUG CLASS ACTIVITY IN IDELALISIB-REFRACTORY CLL oleh S. Skånland, Y. Yanping, P. Athanasiadis, L. Karlsen, A. Urban, I. Murali, S. Fernandes, A. Hilli, K. Taskén, F. Bertoni, A. Mato, E. Normant, J. Brown, G. Tjønnfjord, T. Aittokallio