Using RT112 and MGH‐U3 xenograft models treated for 9 days with a pan‐FGFR inhibitor, PD173074, which delayed tumor growth (Appendix Fig S6A), we also showed in vivo that FGFR3 and MYC were involved in a positive feedback circuit inducing bladder tumor growth. This evidence concerns the gene MYC and urinary bladder neoplasm.