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Mark Douglas Duncan, M.D.

Photo of Dr. Mark Douglas Duncan, M.D.
  • Vice chair, Department of Surgery
  • Associate Professor of Surgery


Abdominal Surgery, Colon Cancer, Colon Tumors, Esophageal Cancer, Gallbladder Cancer, Gallbladder Tumors, Gastric Cancer, Gastroesophageal Cancer, Gastroesophageal Junction Cancer, Gastrointestinal Cancers, Gastrointestinal Stromal Tumors (GIST), Gastrointestinal Tumors, General Surgery, Hereditary Diffuse Gastric Cancer (HDGC), Intestinal Cancer, Intestinal Tumors, Laparoscopic and Minimally Invasive Surgery, Pancreatic Cancer, Sarcoma, Stomach Cancer, Stomach Tumors, Surgery more

Research Interests

CDH1 mutation gastric cancers; HDGC; Tumorigenesis in esophagogastric cancer; and colorectal cancer

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Johns Hopkins Bayview Medical Center

Appointment Phone: 410-550-1226
4940 Eastern Avenue
Baltimore, MD 21224 map
Phone: 410-550-1226 | Fax: 410-550-2011

The Johns Hopkins Hospital (Main Entrance)

Appointment Phone: 410-550-1226
1800 Orleans St.
Sheikh Zayed Tower
Baltimore, MD 21287 map
Phone: 410-550-1226 | Fax: 410-550-2011


Dr. Duncan specializes in gastrointestinal surgery and surgical oncology, including surgery of the esophagus, stomach, intestine, colon and rectum, gallbladder and pancreas, adrenal and retroperitoneal sarcoma.  He co-directs the Gastric Cancer MultidisciplinaryClinic, and wrote the Johns Hopkins Patient Guide for Cancer of the Stomach and Esophagus.  He chairs the cancer committee and directs the tumor board at Johns Hopkins Bayview Medical Center.  Dr. Duncan gives lectures and presentations nationally and internationally on Gastric and GI cancer surgery and works with Johns Hopkins International on cancer programs and centers overseas. more


  • Vice chair, Department of Surgery
  • Associate Professor of Surgery
  • Associate Professor of Oncology

Departments / Divisions

Centers & Institutes



  • MD, Mayo Clinic School of Medicine (1987)


  • MedStar Georgetown University Medical Center / General Surgery (1994)


  • Veterans Affairs Medical Center / Surgery (1992)

Board Certifications

  • American Board of Surgery / General Surgery (1997)

Research & Publications

Activities & Honors


  • Richard S. Ross Clinician Scientist Award
  • Golden Apple Teaching Award, Johns Hopkins Medical School, 2008 - 2009
  • Keith Lillemoe Faculty Teacher of the Year, 2009 - 2010
  • Keith Lillemoe Faculty Teacher of the Year, 2012 - 2013
  • Elected A.O.A, Johns Hopkins, 2013
  • Outstanding Care Award for 2013, Sarcoma Alliance, 2013
  • Elected to Miller-Coulson Academy of Clinical Excellence, 2010
  • Fred Eckhauser Mentorship Award of the Year, 2013 - 2014


  • American College of Surgeons
  • American Society of Clinical Oncology
  • Association of Academic Surgeons
  • Society of Surgical Oncology
  • Society of University Surgeons
  • Southern Surgical Society

Professional Activities

  • Chair, Cancer Committee Johns Hopkins Bayview
  • Chief of Surgical Oncology, Johns Hopkins Bayview

Videos & Media

Johns Hopkins Surgical Oncologists Get Personal

Gastric Cancer | Minan's Story

Gastric Cancer | Stephanie's Story

Recent News Articles and Media Coverage

Stomach Cancer: Know Your Risks & Treatment Options, Johns Hopkins Surgery (4/26/2017)

Patient Ratings & Comments

The Patient Rating score is an average of all responses to physician related questions on the national CG-CAHPS Medical Practice patient experience survey through Press Ganey. Responses are measured on a scale of 1 to 5, with 5 being the best score. Comments are also gathered from our CG-CAHPS Medical Practice Survey through Press Ganey and displayed in their entirety. Patients are de-identified for confidentiality and patient privacy.

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