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Increased bladder cancer risk among workers exposed to o-toluidine and aniline: a reanalysis.
Carreón T; Hein MJ; Viet SM; Hanley KW; Ruder AM; Ward EM
Occup Environ Med 2010 May; 66(5):348-350
Introduction: In 1991, the U.S. National Institute for Occupational Safety and Health (NIOSH) reported an increased bladder cancer risk in a cohort of 1749 workers potentially exposed to o-toluidine and aniline at a chemical manufacturing plant. Additional information showed that workers in certain departments had been misclassified regarding o-toluidine exposure; therefore, we conducted a reanalysis of the data using updated exposure categories. Methods: We updated exposure categories based on information ascertained during a plant walkthrough, documents on file at the plant, interviews with current and former employees, and answers provided by company and union officials on specific questions. Bladder cancer incidence was determined through 31 December 1988 and mortality through 31 December 1994. Results: Thirteen cases of bladder cancer were observed, versus 3.57 expected (New York State rates excluding New York City) [standardized incidence ratio (SIR) 3.64, 95% confidence interval (CI) 1.94-6.23]. Among workers classified as definitely exposed, increasing risks were observed for longer duration of employment [for .10 years, standardized rate ratio (SRR) 6.07, 95% CI 0.77-48.17] and time since first employment in the exposed departments (for .20 years, SRR 3.39, 95% CI 0.40-29.03). One bladder cancer death was observed among those definitely exposed. Conclusions: These findings are comparable to the results reported earlier by NIOSH, and confirm that workers in this plant have an increased risk of bladder cancer.
Bladder-cancer; Bladder-disorders; Chemical-factory-workers; Chemical-industry-workers; Chemical-manufacturing-industry; Mortality-data; Occupational-diseases; Occupational-exposure; Risk-factors; Risk-analysis; Statistical-analysis; Work-practices; Work-environment; Work-performance; Worker-health; Workplace-studies; Author Keywords: o-toluidine; bladder cancer; occupational exposure; NIOSH; chemical industry
Tania Carreón, National Institute for Occupational Safety and Health, DSHEFS, Mail Stop R15, 4676 Columbia Parkway, Cincinnati, OH 45226
Issue of Publication
Occupational and Environmental Medicine
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division