AXL and B-cell chronic lymphocytic leukemia: In contrast, we detected a robust activation of AXL upon treatment of CLL cells with H2O2 at 8–30-fold lower dose suggesting that AXL may be highly sensitive to ROS elevation and that, activation of FGFR in CLL cells in response to H2O2 is likely to be a consequence of AXL activation; not a direct effect of H2O2 on FGFR.