Thorvardur R. Halfdanarson, M.D., is a medical oncologist focusing on gastrointestinal malignancies, especially neuroendocrine tumors and hepatobiliary tumors. His clinical focus includes:

Management of neuroendocrine malignancies (carcinoid tumors included) of all types and origins
Treatment of hepatobiliary and pancreatic cancers, especially in the setting of multidisciplinary care
Management of patients with colorectal cancer including locally recurrent rectal cancer
Diagnosis and management of patients with cancers of unknown primary site
Thoracic malignancies, especially neuroendocrine tumors (lung carcinoid tumors)
In addition to his clinical activities, Dr. Halfdanarson is active in both research and education. His research focus is primarily on neuroendocrine tumors ranging from epidemiology to therapy including novel therapeutics in clinical trials. Dr. Halfdanarson is an assistant program director for the Hematology/Oncology fellowship program at Mayo Clinic. He has received numerous awards for teaching residents and fellows.