Association between screening and the thyroid cancer “epidemic” in South Korea: evidence from a nationwide study

To investigate whether screening for thyroid cancer led to the current "epidemic" in South Korea. Review of the medical records of nationally representative samples of patients with a diagnosis of thyroid cancer in 1999, 2005, and 2008. Sample cases were randomly selected from South Korea's nationwide cancer registry, using a systematic sampling method after stratification by region. 5796 patients with thyroid cancer were included (891 in 1999,...