Cancer Treatment Centers of America

Stage IV anaplastic thyroid cancer

Anaplastic/undifferentiated thyroid cancers are much more aggressive than the other subtypes and are all considered stage IV:

  • Stage IVA: The primary tumor is contained within the thyroid gland, although it may or may not have spread to nearby lymph nodes. It has not spread to distant organs.
  • Stage IVB: The tumor has spread outside of the thyroid gland, and cancer cells may or may not have been found in regional lymph nodes, but have not reached distant sites.
  • Stage IVC: The cancer cells have spread beyond the thyroid gland to more distant parts of the body.

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