metastatic anaplastic carcinomaanaplastic carcinoma thyroid treatmentanaplastic carcinoma pancreasanaplastic carcinoma in dogssmall cell anaplastic carcinomaanaplastic squamous cell carcinomaanaplastic adenocarcinomaanaplastic neoplasmanaplastic tumorundifferentiated thyroid carcinomaanaplastic pancreatic canceranaplastic thyroid cancer metastasis