Cornelius A. Thiels, D.O., M.B.A.

  1. Hepatobiliary and Pancreas Surgeon
  2. Surgical Oncologist


Specialty Groups


  1. Rochester, Minnesota



Dr. Thiels is a cancer surgeon and researcher who specializes in the surgical management of patients with sarcomas, pancreatic cancer, and metastatic colon cancer. He also has extensive training and experience in the treatment of appendiceal cancers, neuroendocrine tumors, pancreatic cysts, gastric cancer, and GIST. Dr. Thiels has special expertise in multimodality treatment of advanced or metastatic cancers, in which surgery is combined with radiation, chemotherapy, or immunotherapy.

Dr. Thiels utilizes minimally invasive techniques to perform a variety of operations (including robotic surgery) and is trained in the placement and management of Hepatic Artery Infusion Pump Chemotherapy for the management of unresectable liver tumors.

Dr. Thiels' lab focuses on improving outcomes for patients undergoing surgery and those with rare and advanced cancers.

  1. Appendix cancer
  2. Carcinoid tumor
  3. Carcinomatosis
  4. Gallbladder cancer
  5. Liver cyst
  6. Liver tumor
  7. Metastatic colorectal cancer
  8. Neuroendocrine carcinoma
  9. Pancreatic cancer
  10. Pancreatic cyst
  11. Pancreatic neuroendocrine tumor
  12. Recurrent cancer
  13. Retroperitoneal sarcoma
  14. Sarcoma
  15. Stomach cancer
  1. Abdominal surgery
  2. Cancer treatment
  3. Cholecystectomy
  4. Cytoreductive surgery
  5. Gastrectomy
  6. HIPEC
  7. Irreversible electroporation
  8. Laparoscopic surgery
  9. Liver resection
  10. Microwave ablation for cancer
  11. Minimally invasive cancer surgery
  12. Minimally invasive liver surgery
  13. Minimally invasive pancreas surgery
  14. Pancreatectomy
  15. Pancreatic enucleation
  16. Robotic surgery
  17. Splenectomy
  18. Whipple procedure

Rochester, Minnesota

  1. 2021
    Chief Fellow - Complex General Surgical Oncology Fellowshp Memorial Sloan-Kettering Cancer Center
  2. 2019
    Chief ResidentMayo Clinic
  3. 2016
    Research Scholar - Surgical Outcomes Research FellowshipMayo Clinic
  4. 2014
    Internship - General SurgeryMayo Clinic
  5. 2013
    Doctor of Osteopathic MedicineKansas City University of Medicine and Biosciences
  6. 2013
    MBA - Healthcare AdministrationRockhurst University


  1. 2019
    General SurgeryAmerican Board of Surgery

Awards and honors

  1. 2020
    Dr. Murray F. Brennan/David and Monica Gorin Sarcoma FellowMemorial Sloan-Kettering Cancer Center/Weil Cornell New York Presbyterian
  2. 2018
    Mayo Brother Distinguished Fellowship AwardMayo Clinic
  3. 2018
    H.K. Gray Travel Award Mayo Clinic
  4. 2017
    Nygaard AwardMayo Clinic
  5. 2017
    Inlow AwardMayo Clinic
  6. 2016
    Mayo International Health Program (MIHP) Scholarship Mayo Graduate School of Medicine, Mayo Clinic College of Medicine and Science, Department of Education Administration
  7. 2014
    Balfour AwardMayo Clinic
  8. 2013
    Robert B. Cotter Award in SurgeryKansas City University of Medicine and Biosciences
  9. 2010
    Dr. Vernon Hayes Physicians Hall of Sponsors ScholarshipKansas City University of Medicine and Biosciences