CDKN1A and urinary bladder cancer: Some years ago, Lacombe et al.12 reported a single bladder cancer, out of 27 analysed, with a protein-truncating CDKN1A mutation, and we additionally note that contemporaneous TCGA bladder cancer exome sequencing data (January 2014) show 18 CDKN1A-mutant bladder cancers of a total of 130 analysed13.