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Faculty & Staff

Gregory E. Idos, M.D.

Gregory E. Idos, M.D.
Assistant Professor of Clinical Medicine
Department of Surgery / Division of Colorectal Surgery

Keck School of Medicine of USC

USC Norris Cancer Center and Hospital
1441 Eastlake Avenue, Suite 7418
Los Angeles, CA 90033-4612
Tel: (323) 865-3690
Fax: (323) 865-3671




Areas of Treatment

  • Gastroenterology
  • Cancer Screening and Prevention
  • Diagnosis and Management of Hereditary/Familial Cancer Syndromes
  • Gastrointestinal Cancer


  • Gastroenterology
  • Internal Medicine
  • Genetics


Dr. Gregory Idos is a gastroenterologist with specialized training in hereditary cancer syndromes. Having trained in Boston at Brigham and Women's Hospital and Dana Farber Cancer Center under the direction of national experts, Dr. Idos has an extensive background in caring for patients with hereditary colorectal cancer syndromes, notably Lynch Syndrome and familial adenomatous polyposis (FAP). Currently, he works with Stephen Gruber, Director of USC Norris Comprehensive Cancer Center, as part of the USC Norris Cancer Genetics Program. The USC Norris Cancer Genetics Program specializes in care for persons with a personal or family history of cancer who may benefit from genetic testing and counseling to understand and manage their risk of cancer. In addition, Dr. Idos' research interest is focused on the study of gastrointestinal cancer and cancer chemoprevention. Currently, he directs studies aimed at understanding the use of genetic information for the overall risk reduction and prevention of cancer.

For further information about genetic cancer risk assessment services at the USC Norris Comprehensive Cancer Center, please go to the following link.


  • Doctor of Medicine, University of Vermont College of Medicine, 2006


  • LAC+USC Medical Center, Internal Medicine, 2006 - 2007


  • LAC+USC Medical Center, Internal Medicine, 2006 - 2009


  • Harvard Medical School, Brigham and Women's Hospital, Clinical and Research Fellow in Gastroenterology, Hepatology and Endoscopy, 2009 - 2012

Professional Society Memberships

  • American College of Physicians
  • American Gastroenterological Association
  • American College of Gastroenterology
  • American Association for Cancer Research


  • Top Doctor, Pasadena Magazine
  • Howard Hughes Undergraduate Research Fellow
  • Intern of the Year, LAC+USC Medical Center
  • Senior Resident of the Year, LAC+USC Medical Center
  • Fellowship Teaching Award, Brigham and Women's Hospital, Harvard Medical School    

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Appointments (323) 865-3690


USC Colorectal Surgery
1450 San Pablo Street
Healthcare Consultation Center 4
Suite 6200
Los Angeles, CA 90089

Phone: (323) 865-3690
Fax: (323) 865-3671

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