FGFR3 and neoplasm: These results indicate that the acute inflammatory response to carcinogen treatment, particularly the recruitment of neutrophils to the bladder, was transiently suppressed in the presence of FGFR3 S249C mutation at the pre‐tumour stage (2 weeks), while at 20 weeks, FGFR3S249C bladders were mildly more inflamed than wild‐type.