Print Departments and specialties Mayo Clinic has one of the largest and most experienced practices in the United States, with campuses in Arizona, Florida and Minnesota. Staff skilled in dozens of specialties work together to ensure quality care and successful recovery. Departments that treat this condition Cancer Care at Mayo Clinic Gastroenterology and Hepatology Gastrointestinal Neoplasia Clinic Hepatobiliary and Pancreas Surgery in Jacksonville Hepatobiliary and Pancreas Surgery in Rochester Oncology (Medical) Pediatric Hematology/Oncology Radiation Oncology Radiology Surgical Oncology and Endocrine Surgery in Arizona Areas that research this condition Radiology Research Doctors who treat this condition Edit search filters close Narrow your search By location Rochester, MN By last name Find a doctor whose last name begins with the letter A A Find a doctor whose last name begins with the letter B B There are no doctors whose last name begins with the letter C C Find a doctor whose last name begins with the letter D D There are no doctors whose last name begins with the letter E E There are no doctors whose last name begins with the letter F F Find a doctor whose last name begins with the letter G G active Find a doctor whose last name begins with the letter H H There are no doctors whose last name begins with the letter I I There are no doctors whose last name begins with the letter J J Find a doctor whose last name begins with the letter K K Find a doctor whose last name begins with the letter L L There are no doctors whose last name begins with the letter M M There are no doctors whose last name begins with the letter N N There are no doctors whose last name begins with the letter O O There are no doctors whose last name begins with the letter P P There are no doctors whose last name begins with the letter Q Q Find a doctor whose last name begins with the letter R R Find a doctor whose last name begins with the letter S S Find a doctor whose last name begins with the letter T T There are no doctors whose last name begins with the letter U U There are no doctors whose last name begins with the letter V V Find a doctor whose last name begins with the letter W W There are no doctors whose last name begins with the letter X X There are no doctors whose last name begins with the letter Y Y There are no doctors whose last name begins with the letter Z Z Reset all filters Search Tips Use quotes for phrases. Even if there are no auto-suggestions within the search field, hit "Search" anyway, as you may still get results. Displaying 1-1 out of 1 doctors available Last Name Initial: H Thor R. Halfdanarson, M.D. Oncologist Hematologist Rochester, MN Areas of focus: Chemotherapy for colon cancer, Neuroendocrine tumor, Pancreatic neuroendocrine tumor, Gastrointestinal stromal tumor, C...arcinoma of unknown primary Show more areas of focus for Thor R. Halfdanarson, M.D. Research Profiles Edit search filters close Narrow your search By location Arizona Florida Minnesota View all View all physicians • Arizona Faigel, Douglas O. M.D. Arizona By Mayo Clinic Staff Request an appointment Diagnosis & treatment Feb. 25, 2025 Print Living with gastrointestinal stromal tumor (GIST)? Connect with others like you for support and answers to your questions in the Sarcoma support group on Mayo Clinic Connect, a patient community. Sarcoma Discussions GNET Sarcoma-Gastrointestinal Neuroectodermal Tumors 21 Replies Tue, Jun 10, 2025 chevron-right Diagnosed with sarcoma? Let's share 953 Replies Tue, Jun 10, 2025 chevron-right How do you, as a parent, deal with the anger? Son has sarcoma 27 Replies Sat, May 31, 2025 chevron-right See more discussions Related Associated Procedures Palliative care Products & Services A Book: Mayo Clinic Family Health Book Newsletter: Mayo Clinic Health Letter — Digital Edition Show more products and services from Mayo Clinic Gastrointestinal stromal tumor (GIST)Symptoms&causesDiagnosis&treatmentDoctors&departments Research: It's all about patients Show transcript for video Research: It's all about patients [MUSIC PLAYING] Joseph Sirven, M.D., Professor of Neurology, Mayo Clinic: Mayo's mission is about the patient. The patient comes first. So the mission and research here is to advance how we can best help the patient, how to make sure the patient comes first in care. So in many ways, it's a cycle. It can start with as simple as an idea worked on in a laboratory, brought to the patient bedside, and if everything goes right — and let's say it's helpful or beneficial — then brought on as a standard approach. And I think that is one of the unique characteristics of Mayo's approach to research — that patient-centeredness — that really helps to put it in its own spotlight. CON-20357212 Patient Care & Health Information Diseases & Conditions Gastrointestinal stromal tumor (GIST)