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International Journal of Epidemiology, Vol 22, S22-S28, Copyright © 1993 by International Epidemiological Association

ARTICLES

Development and use of a welding process exposure matrix in a historical prospective study of lung cancer risk in European welders

M Gerin, AC Fletcher, C Gray, R Winkelmann, P Boffetta and L Simonato
Departement de Medecine Succursale du Travail et d'Hygiene du Milieu, Universite de Montreal, Quebec, Canada.

A welding process exposure matrix has been developed relating 13 welding process-welded metal combinations to average exposure levels for total welding fumes, total chromium, chromium (VI) and nickel. Quantitative estimates were derived from consultation of literature sources and of some company data. This matrix was applied to the welding histories of 11,092 welders in the framework of an IARC multicentre study. When detailed welding history was not available at the individual level the average company welding practice profile was applied. No dose-response relationship emerged for lung cancer risk with cumulative dose of the carcinogens chromium (VI) and nickel for stainless steel welders. Dilution of the dose-response relationship could result from between-plant and within-plant variability, and exposure in jobs not accounted for in the study, but not from the partial use of company versus individual data. It is also possible that there is no increased risk related to chromium and nickel exposure in this group of workers. Matrix exposure estimates would need to be validated and the matrix possibly refined by comparison with a variety of comprehensive welding exposure data sets.
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