In reply to: Lawless et al. Stalk versus base invasion in pT1 papillary cancers of the bladder: improved substaging system predicting the risk of progression. Issue 2 (27th October 2017) - Patriarca, Carlo; Hurle, Rodolfo; Colombo, Piergiuseppe; Colecchia, Maurizio; Freschi, Massimo; Conti, Giario; Petracco, Guido; Colombo, Renzo