Anaplastic Thyroid Carcinoma
Epidemiology
- male:female 1.5:2
- typically >60yo
- 30% have long-standing goiter, then rapid progression
- IVa - localized - 10%
- IVb - locally advanced - 35%
- IVc - metastatic - 55% (lung, bone, liver, brain)
- Differentiated thyroid cancer (DTC) component or hx of DTC in 58-90% of cases