Work exposure to diesel fumes tied to lung cancer

The study has a number of key limitations, one being a lack of data on the subjects' actual exposure to diesel exhaust. Moreover, case-control studies can offer only limited evidence of an association between two variables (in this case, diesel-exhaust exposure and lung cancer risk). And they cannot establish the extent to which diesel exhaust might affect any one worker's absolute risk of developing lung cancer.
Studies that follow a population of initially healthy people over time offer stronger evidence of whether a particular exposure is related to a disease risk.
Straif noted that results from a long-term U.S. government study of diesel-exhaust exposure and lung cancer among miners are expected to be released soon.
He said that study "will be very influential for the overall assessment of the carcinogenicity of diesel motor exhaust."

Source : http://www.reuters.com/article/idUSTRE6A858X20101109?pageNumber=2

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