CC-671 is a dual TTK protein kinase (IC50: 0.005 μM) /CLK2 (IC50: 0.006 μM) inhibitor.

CLK2:0.006 μM, TTK:0.005 μM

The kinase selectivity profile of CC-671 is assessed. The screen is conducted with the concentration of CC-671 held constant at 3 μM. The TTK binding affinity is measured using the kinase binding assays. The kinase binding assays are based on the binding and displacement of a proprietary, Alexa Fluor 647-labeled, ATP-competitive kinase inhibitor scaffold[1].

Female SCID mice are inoculated subcutaneously with 5×106 Cal-51 cells. Mice with tumours of approximately 125 mm3 are randomized and treated intravenously at various doses and schedules of CC-671 (n=8 to10/group). Tumours are measured twice a week for the duration of the study. The long and short axes of each a tumour are measured using a digital calliper in millimetres and the tumour volumes are calculated[1].