MAPK1 and urinary bladder cancer: FGFR3 upregulates ETS translocation variant 5 (ETV5) via the MAPK/ERK pathway, leading to elevated transcriptional coactivator with PDZ‐binding motif (TAZ), a cotranscriptional regulator of the Hippo signaling pathway involved in cell contact inhibition, which promotes the proliferation of bladder cancer cells.255