Incidence of cancer and exposure to toluene diisocyanate and methylene diphenyldiisocyanate: a cohort based case-referent study in the polyurethane foam manufacturing industry.
OBJECTIVE
To assess the association between occupational exposure to toluene diisocyanate or methylene diphenyldiisocyanate and risk of cancer.


METHODS
A cohort based case-referent study. STUDY BASE: 7023 subjects employed during the period 1958 to 1987 in nine Swedish polyurethane foam manufacturing plants.


METHODS
Odds ratios adjusted with respect to the matching factors (age at risk, calendar year at risk, sex, and plant), calculated from the conditional logistic regression model.


RESULTS
A non-significant association was found between high exposure to isocyanates and prostate cancer (OR 2.66, 90% confidence interval (90% CI) 0.39-18.1), which was not enhanced when an induction latency period of 10 years was applied. An association between isocyanate exposure and colon cancer was even weaker. No associations were seen for non-Hodgkin's lymphoma and rectal cancer.


CONCLUSIONS
The tentative associations, derived from a previous cohort study, between isocyanate exposure and excess risk for non-Hodgkin's lymphoma and rectal cancer were not supported. Instead, non-significant associations with prostate cancer, and possibly colon cancer, were seen.
Hagmar
L
L
Department of Occupational and Environmental Medicine, University Hospital, Lund, Sweden.
Strömberg
U
U
Welinder
H
H
Mikoczy
Z
Z
D016022:Case-Control Studies; D015331:Cohort Studies; D006801:Humans; D015994:Incidence; D017953:Isocyanates / Q000009:adverse effects*; D008297:Male; D009369:Neoplasms / Q000139:chemically induced* / Q000453:epidemiology; D009784:Occupational Diseases / Q000139:chemically induced* / Q000453:epidemiology; D016273:Occupational Exposure; D011140:Polyurethanes / Q000138:chemical synthesis*; D011471:Prostatic Neoplasms / Q000139:chemically induced / Q000453:epidemiology; D013548:Sweden / Q000453:epidemiology; D014051:Toluene 2,4-Diisocyanate / Q000009:adverse effects*; D001559:Benzhydryl Compounds
D017953:Isocyanates; D011140:Polyurethanes; D014051:Toluene 2,4-Diisocyanate; C005969:4,4'-diphenylmethane diisocyanate; D001559:Benzhydryl Compounds