Re: Grant D. Stewart, Fiach C. O’Mahony, Alexander Laird, et al. Carbonic Anhydrase 9 Expression Increases with Vascular Endothelial Growth Factor–Targeted Therapy and Is Predictive of Outcome in Metastatic Clear Cell Renal Cancer. Eur Urol. In press. http://dx.doi.org/10.1016/j.eururo.2014.04.007