Introduction to European comments on "Medullary Thyroid Cancer: management guidelines of the American Thyroid Association".

Guest Editors of Thyroid Research supplement devoted to medullary thyroid cancer present the history on how the discussion about "Medullary Thyroid Cancer: management guidelines of the American Thyroid Association" was initiated and subsequently widely commented before and during European Thyroid Association - Cancer Research Network Meeting in Lisbon. It is explained why it has been decided to publish the manuscripts within the supplement - to document voices from the discussion and popularize them.