Ongoing risk of bladder cancer among former workers at the last benzidine manufacturing facility in the USA

Occup Environ Med. 2021 Sep;78(9):625-631. doi: 10.1136/oemed-2020-106431. Epub 2021 May 10.

Abstract

Objective: To determine whether there is an ongoing risk of developing bladder cancer in a previously studied cohort of workers exposed to both benzidine and dichlorobenzidine or dichlorobenzidine only in the last benzidine manufacturing plant in the USA.

Methods: Workers (n=488) were identified from the quarterly 941 forms the employer was required to submit to the Social Security Administration from 1960 to 1977. Exposures were assigned based on dates worked and known benzidine/dichlorobenzidine production schedules. Incidence, vital status and cause of death were determined through 2014. Analyses were restricted to white men.

Results: Bladder cancer incidence and mortality were significantly increased (25 incident cases, standardised incidence ratio (SIR) 2.19, 95% CI 1.42 to 3.23, and 5 deaths, standardised mortality ratio (SMR) 3.79, 95% CI 1.23 to 8.84). There were significant increases in incidence and mortality in those exposed to both benzidine and dichlorobenzidine (SIR 3.11, 95% CI 1.97 to 4.67, SMR 4.10, 95% CI 1.12 to 10.50), but not among workers exposed to dichlorobenzidine only (two incident cases, SIR 0.89, 95% CI 0.11 to 3.23 and one death, SMR 2.90, 95% CI 0.07 to 16.15). Bladder cancer incidence and mortality were increased in individuals with >20 years since last exposure with >5 years worked (six observed, SIR 5.94, 95% CI 2.18 to 12.92 and two deaths, SMR 7.93, 95% CI 0.96 to 28.65).

Conclusions: Incidence and mortality due to bladder cancer increased among workers exposed to benzidine but not among workers exposed only to dichlorobenzidine. The risk of incidence and death from bladder cancer remain elevated more than 20 years after last exposure to benzidine in those who worked >5 years.

Keywords: cancer; retrospective exposure assessment.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Benzidines / toxicity*
  • Chemical Industry*
  • Humans
  • Incidence
  • Male
  • Middle Aged
  • Occupational Diseases / chemically induced*
  • Occupational Diseases / epidemiology
  • Occupational Diseases / mortality
  • Occupational Exposure / adverse effects
  • Risk Factors
  • Urinary Bladder Neoplasms / chemically induced*
  • Urinary Bladder Neoplasms / epidemiology
  • Urinary Bladder Neoplasms / mortality

Substances

  • Benzidines
  • benzidine