RT Journal Article
SR Electronic
T1 Occupational exposures to leaded and unleaded gasoline engine emissions and lung cancer risk
JF Occupational and Environmental Medicine
JO Occup Environ Med
FD BMJ Publishing Group Ltd
SP oemed-2017-104801
DO 10.1136/oemed-2017-104801
A1 Mengting Xu
A1 Jack Siemiatycki
A1 Jérôme Lavoué
A1 Romain Pasquet
A1 Javier Pintos
A1 Marie-Claude Rousseau
A1 Lesley Richardson
A1 Vikki Ho
YR 2017
UL http://oem.bmj.com/content/early/2017/12/21/oemed-2017-104801.abstract
AB Objectives To determine whether occupational exposure to gasoline engine emissions (GEE) increased the risk of lung cancer and more specifically whether leaded or unleaded GEE increased the risk.Methods Two population-based case–control studies were conducted in Montreal, Canada. The first was conducted in the early 1980s and included many types of cancer including lung cancer. The second was conducted in the late 1990s and focused on lung cancer. Population controls were used in both studies. Altogether, there were 1595 cases and 1432 population controls. A comprehensive expert-based exposure assessment procedure was implemented and exposure was assessed for 294 agents, including unleaded GEE, leaded GEE and diesel engine emissions (DEE). Logistic regression analyses were conducted to estimate ORs between various metrics of GEE exposure and lung cancer, adjusting for smoking, DEE and other potential confounders.Results About half of all controls were occupationally exposed to GEE. Irrespective of the metrics of exposure (any exposure, duration of exposure and cumulative exposure) and the type of lung cancer, and the covariates included in models, none of the point estimates of the ORs between occupational exposure to leaded or unleaded GEE and lung cancer were above 1.0. Pooling two studies, the OR for any exposure to leaded GEE was 0.82 (0.68–1.00).Conclusions Our results do not support the hypothesis that occupational exposure to GEE increases the risk of lung cancer.