Mesothelioma is a rare but aggressive cancer affecting the lining of the lungs, heart, or abdomen. It is a stealth disease, with a latency period of between 20 to 50 years from first toxic exposure to diagnosis, by which time it is typically so well advanced that the survival prognosis is poor. A decades-long effort is gradually quantifying the mesothelioma risk to thousands of present and former taconite miners in northern Minnesota.
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