World Trade Center (WTC)-exposed rescue/recovery workers have an elevated risk of thyroid cancer compared with the general United States population but to-date none of the compounds found at the WTC disaster site has been proven to be associated with thyroid cancer. Instead the elevated rate might be the result of incidental detection due to increased medical surveillance provided to the WTC-exposed rescue/recovery workers. This study will investigate the method of detection of thyroid cancer among WTC-exposed rescue/recovery workers and a non-WTC exposed reference population to determine the rate of thyroid cancer cases diagnosed incidentally and to identify reasons for the elevated risk of thyroid cancer among WTC-exposed populations.
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