Re: Prognostic value of MET, RON and histoprognostic factors for urothelial carcinoma in the upper urinary tract. E. Comperat, M. Roupret, E. Chartier-Kastler, M. O. Bitker, F. Richard, P. Camparo, F. Capron and O. Cussenot. J Urol 2008; 179: 868-872.