Publication of a landmark government study probing whether diesel engine exhaust causes lung cancer in miners — already 20 years in the making — has been delayed by industry and congressional insistence on seeing study data and documents before the public does.
A federal judge has affirmed the right of an industry group and a House committee to review the materials and has held the Department of Health and Human Services in contempt for not producing all of them.
The much-anticipated study of 12,000 miners exposed to diesel fumes carries broad implications. If the research suggests a strong link between the fumes and cancer, regulation and litigation could ramp up — with consequences not only for underground mining, but also for industries such as trucking, rail and shipping.
Exposure isn't limited to workers; people who live near ports, rail yards and highways also are subjected to diesel exhaust laced with carcinogens such as benzene, arsenic and formaldehyde.
But for the time being, at least, the results of an $11.5 million investigation by the National Cancer Institute and the National Institute for Occupational Safety and Health are under lock and key.
Richard Clapp, emeritus professor of environmental health at Boston University, is among several public health experts who called the situation unusual.
"I've never heard of an industry group demanding manuscripts from a government agency before a study has been accepted for publication," Clapp said. “My guess is it would give the industry a chance to prepare their rejoinder early. They want to delay anything that’s going to implicate them in liability for lung cancer.”