Reply to Andrea Minervini, Sergio Serni, Marco Carini and Claudio Di Cristofano's Letter to the Editor re: Anders Lidgren, Ylva Hedberg, Kjell Grankvist, Torgny Rasmuson, Anders Bergh and Börje Ljungberg. Hypoxia-Inducible Factor 1α Expression in Renal Cell Carcinoma Analyzed by Tissue Microarray. Eur Urol 2006;50:1272–7