For all tumours considered together, we found a strong association between FGFR3 and TP53 mutations (OR = 0.49 [0.33, 0.72], p = 0.001), such that the odds of a given FGFR3-mutated tumour having a TP53 mutation were half those for FGFR3 wild-type tumours. The gene discussed is TP53; the disease is neoplasm.