Screening workers exposed to 4,4'-Methylenebis(2-chloroaniline) for Bladder Cancer by Cystoscopy

Elizabeth Ward, William Halperin, Michael Thun, H. Barton Grossman, Burton Fink, Leopold Koss, Ana Maria Osorio, Paul Schulte

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


A bladder cancer incidence study was conducted among 540 workers exposed to the potential bladder carcinogen 4,4'- methylenebis(2-chloroaniline) from 1969 to 1979. Among the 385 workers who participated in a urine screening examination, none had suspicious or positive cytology. Twenty-one workers had at least one reading of atypia and 60 had either a positive dipstick for heme or greater than five red blood cells per low power field. The study protocol initially involved referral to private physicians for follow-up of any suspicious laboratory results. However, the diagnosis by cystoscopy of a bladder tumor in a nonsmoking man less than 30 years old with low-level hematuria prompted us to offer cystoscopy to all members of the cohort. A total of three tumors were identified in 200 persons who received cystoscopy. All were low-grade, papillary tumors and two occurred in men with completely normal urine screening results. These findings suggest that cystoscopy of asymptomatic persons should be considered in designing bladder cancer screening programs in high-risk cohorts.s

Original languageAmerican English
Pages (from-to)865-868
Number of pages4
JournalJournal of Occupational Medicine
Issue number9
StatePublished - Sep 1990

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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