CORRESPONDENCE Re: Biomarker Risk Assessment and Bladder Cancer Detection in a Cohort Exposed to

I studied with great interest the paper by Hemstreet et al. (1). However, I dis-agree with the authors on several points. First, I disagree that “... approximately 20%–25 % (of bladder cancers) are re-lated to occupational exposure to chemi-cals, such as benzo[a]pyrene, benzidine, and -naphthyamine... ” (1), because benzo[a]pyrene is not a recognized hu-man bladder carcinogen (2,3). Second, the authors cited articles [references 43–45 in (1)] that stated that genetic changes in chromosomes 9 and 17 may play a role in bladder cancer development. However, there are sev