NDLI: Pooled exposure–response analyses and risk assessment for lung cancer in 10 cohorts of silica-exposed workers: an IARC multicentre study

Content Provider	Springer Nature Link
Author	Steenland, Kyle Mannetje, Andrea Boffetta, Paolo Stayner, Leslie Attfield, Michael Chen, Jingqiong Dosemeci, Mustafa DeKlerk, Nicholas Hnizdo, Eva Koskela, Riitta Checkoway, Harvey
Copyright Year	2001
Abstract	Objectives: Silica is one of the most common occupational exposures worldwide. In 1997 the International Agency for Research on Cancer (IARC) classified inhaled crystalline silica as a human carcinogen (group 1), but acknowledged limitations in the epidemiologic data, including inconsistencies across studies and the lack of extensive exposure–response data. We have conducted a pooled exposure–response analysis of 10 silica-exposed cohorts to investigate lung cancer. Methods: The pooled cohort included 65,980 workers (44,160 miners, 21,820 nominees), and 1072 lung cancer deaths (663 miners, 409 nonminers). Follow-up has been extended for five of these cohorts beyond published data. Quantitative exposure estimates by job and calendar time were adopted, modified, or developed to permit common analyses by respirable silica (mg/m3) across cohorts. Results: The log of cumulative exposure, with a 15-year lag, was a strong predictor of lung cancer (p = 0.0001), with consistency across studies (test for heterogeneity, p = 0.34). Results for the log of cumulative exposure were consistent between underground mines and other facilities. Categorical analyses by quintile of cumulative exposure resulted in a monotonic trend with odds ratios of 1.0, 1.0, 1.3, 1.5, 1.6. Analyses using a spline curve also showed a monotonic increase in risk with increasing exposure. The estimated excess lifetime risk (through age 75) of lung cancer for a worker exposed from age 20 to 65 at 0.1 mg/m3 respirable crystalline silica (the permissible level in many countries) was 1.1–1.7%, above background risks of 3–6%. Conclusions: Our results support the decision by the IARC to classify inhaled silica in occupational settings as a carcinogen, and suggest that the current exposure limits in many countries may be inadequate. These data represent the first quantitative exposure–response analysis and risk assessment for silica using data from multiple studies.
Starting Page	773
Ending Page	784
Page Count	12
File Format	PDF
ISSN	09575243
Journal	Cancer Causes & Control
Volume Number	12
Issue Number	9
e-ISSN	15737225
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Public Health/Gesundheitswesen Hematology Oncology Epidemiology
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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