Response to the letter to the editor: 1q gain is a frequent finding in preoperatively treated Wilms tumors, but of limited prognostic value for risk satisfaction in the SIOP2009/Gesellschaft für Pädiatrische Onkologie und Hämatologie (GPOH) trial. Issue 6 (28th March 2015) - Pritchard‐Jones, Kathy; Williams, Richard; Segers, Heidi; van den Heuvel‐Eibrink, Marry; Pieters, Rob; van Tinteren, Harm; Vujanic, Gordan; Bown, Nick