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Thyroid cancer (TC) incidence, in France, has dramatically increased over the last two decades. In order to try and account for this observation, the French Department of Health requested the Public Health Agency to coordinate a multidisciplinary Thyroid Cancer Committee (TCC). The TCC analysed the temporal incidence trend in France, evaluated the contribution of changes in diagnostic practices of thyroid diseases to the observed increase of TC, and set up guidelines to improve the national surveillance system of TC.

The increased incidence of TC is real (8.1% and 6.2% per year in women and in men, respectively), mainly due to papillary type with an epidemic of microcarcinomas (43% of operated cancers, period 1998-2001) associated to the extensiveness of thyroidectomies. Multicentric studies showed a significant increase, from 1980 to 2000, in ultrasonographic (3 to 84.8%) and cytological procedures …