FGFR3 and renal pelvis/ureter urothelial carcinoma: The EpiC-high cluster was enriched in SWI/SNF gene somatic mutations, more often associated with a muscle-invasive type of UTUC (69%) resulting in a shorter overall survival, while EpiC-low was enriched in FGFR3 mutations associated with non-MI disease (92%) [48].