NVP-TAE684 repressed ALK-activated signalling pathways and induced apoptosis of LM1 DLBCL cells. Inhibition of ALK-activity resulted in sustained tumor regression in the xenotransplant tumor model. Molecular cytogenetics as well as RT-PCR for CLTC-ALK transcripts revealed t(2;17) (p23;q23) with expression of CLTC-ALK in the cells of the relapsed tumor (Figure 2A).