Through in vitro drug screening, we identified navitoclax as an agent with potent activity against GBM cell lines with high DKK3 expression....Navitoclax (ABT-263) reduced the growth of cancer cell lines with high DKK3 expression (r = −0.338, p = 0.018 [Pearson’s correlation] and 0.023 [Student’s t test]) (Fig. 4D).