Treatment of CLL cells with the ant-ROR1 antibody cirmtuzumab could block the capacity of Wnt5a to induce cortactin to complex with ROR1, as assessed in immunoblot analysis of ip generated from treated CLL cells using an anti-ROR1 mAb (4A5) specific for a different epitope than that recognized by cirmtuzumab (Fig. 2d). Here, ROR1 is linked to B-cell chronic lymphocytic leukemia.