Hazem Hammad, MD, FASGE

Dr. Hammad is a highly respected consultant and specialist in Advanced Therapeutic Endoscopy. He currently serves as Chief of Gastroenterology and Hepatology at King Hussein Cancer Center in Amman, Jordan. Previously, he held the position of Associate Professor of Medicine in the Division of Gastroenterology and Hepatology, specializing in Advanced Therapeutic Endoscopy, at the University of Colorado from 2016 to 2024.

Dr. Hammad earned his medical degree from the University of Jordan Medical School and completed his Internal Medicine Residency at Wayne State University in Detroit, MI. He pursued his Gastroenterology and Hepatology Fellowship at the University of Missouri Hospital and Clinics, where he also served as Assistant Professor of Clinical Medicine for four years before undergoing advanced endoscopy training at the University of Colorado in Denver. Additionally, he completed specialized training in enhanced imaging, advanced endoscopic resection, and third space endoscopy techniques, such as endoscopic submucosal dissection (ESD) and peroral endoscopic myotomy (POEM), in both the United States and Japan.

Dr. Hammad’s clinical and research focus includes third space endoscopy, advanced resection techniques, enhanced imaging for early detection of gastrointestinal neoplasia, esophageal disorders, and pancreatico-biliary diseases. He has authored numerous scientific papers, reviews, and book chapters, contributing significantly to the field.

• Medical Degree: University of Jordan - School of Medicine, Amman, Jordan
• Internal Medicine Residency: Wayne State University, Detroit, MI
• Clinical Research Rotation: Mayo Medical Center, Rochester, MN
• Gastroenterology Fellowship: University of Missouri – Columbia
• Chief GI Fellow: University of Missouri – Columbia
• Advanced Endoscopic Imaging/Resection Training: Palo Alto VA Hospital (Stanford University)
• Advanced Hands-on ESD Course: Kobe University, Japan
• Therapeutic Endoscopy Fellowship: University of Colorado – Denver
• Advanced ESD Training: National Cancer Center and Keio University, Japan 

1. Bechtold ML, Hammad H, Arif M, Choudhary A, Puli SR, Antillon MR. Perforation upon Retroflexion:  An Endoscopic Complication and Repair. Endoscopy. 2009;41 Suppl 2:E155-6.

2. Bachour K , Zmily H, Kizilbash M , Awad K, Hourani R, Hammad H, Sobel JD, Ghali JK, Levine D, Afonso L. Significance of Valvular Perforation in Left-Sided Infective Endocarditis. Clin Cardiol. 2009 Dec; 32(12):E55-62.

3.  Singla A, Hammad H, Hammoud G. Uncommon Cause of Acute Drug-induced Liver Injury Following Mammoplasty. Gastroenterology Research, 2010;3(4):171-172.

4. Szary NM, Gupta R, Choudhary A, Matteson ML, Arif M, Hammad H, Bechtold ML. Erythromycin prior to endoscopy in acute upper gastrointestinal bleeding: A meta-analysis. Scand J Gastroenterol. 2011 Jul; 46(7-8):920-4.

5. Ashraf I, Choudhary A, Arif M, Matteson ML, Hammad H, Puli SR, Bechtold ML. Ursodiol use in patients with ulcerative colitis and primary sclerosing cholangitis for prevention of colon cancer: A meta-analysis. Indian J Gastroenterol. 2012 Apr;31(2):69-74.

6. Abdullah O, Pele NA, Fu Y, Ashraf I, Arif M, Bechtold ML, Grewal A, Hammad H. A Rare Cause of Massive Upper Gastrointestinal Hemorrhage in Immunocompromised Host. Gastroenterology Research. 2012;5(1):33-36.

7. Ashraf I, Paracha SR, Arif M, Choudhary A, Matteson ML, Clark RE, Godfrey JD, Hammad H, Bechtold ML. Digital rectal examination versus spontaneous passage of stool for fecal occult blood testing. South Med J. 2012 Jul;105(7):357-61.

8. Ahmad DS, Esmadi M, Hammad H. Malnutrition secondary to non-compliance with vitamin and mineral supplements after gastric bypass surgery: What can we do about it?” Am J Case Rep 2012; 13: 209-13.

9. Esmadi M, Ahmad DS, Odum B, Diaz-Arias A, Hammad H. Sarcoidosis: an extremely rare cause of granulomatous enterocolitis. J Gastrointestin Liver Dis. 2012 Dec; 21(4):423-5.

10. Hammad H, Godfrey J. A Special Valentine's day endoscopic treat. Thanks to Dr. Barrett. Image of the month. Am J Gastroenterol. February  2014.

11. Lim RG, Rawlings AL, Schultz SL, Bradley LH, Hammad H, Bechtold ML. Unusual cause of constipation: sunflower seeds bezoar. Endoscopy. 2013;45 Suppl 2 UCTN:E46.

12. Esmadi M, Ahmad D, Hammad H. Education and Imaging. Gastrointestinal: penile prosthesis reservoir appearing as a cecal submucosal mass. J Gastroenterol Hepatol. 2014 Sep;29(9):1660.

13. Hammad H, Esmadi M, Ahmad D, Reicks M, Rawlings A. Laparoscopic and hand assisted deep enteroscopy with polypectomy in Peutz-Jeghers syndrome. Gastrointest Endosc. 2014 Jan;79(1):26.

14. Esmadi M, Ahmad D, Fu Y, Hammad H. Upper gastrointestinal tract metastasis from lung cancer. Dig Liver Dis. 2013 Dec 4.

15. Esmadi M, Ahmad D, Hammad H. Endoscopic surveillance for gastric ulcers. South Med J. 2014 May;107(5):289-91.

16. Hammad H, Frazier SR, Holly JS, Esmadi M. At 64, Peutz-Jeghers Syndrome is still in the differential! Am J Gastroenterol. 2014 Nov;109(11):1835-7.

17. Esmadi M, Ahmad D, Deiter D, Hammad H. Mantle cell lymphoma of the colon. Endoscopy. 2014;46 Suppl 1 UCTN:E126-7.

18. Lopez K, Ahmad D, Hinds A, Hammad H, Godfrey J, Matteson M, Bechtold M. Pseudoaneurysm eroding into the duodenal bulb: An extremely rare case and treatment modality. Endoscopy. 2014;46 Suppl 1 UCTN:E124-5.

19. Hammad H, Chennamaneni V, Ahmad D, Esmadi M. Strangulated umbilical hernia after esophagogastroduodenoscopy in a patient with liver cirrhosis and ascites. Endoscopy. 2014;46 Suppl 1 UCTN:E247.

20. Hammoud G, Hammad H, Ibdah J. Endoscopic assessment and management of early esophageal adenocarcinoma. World J Gastrointest Oncol. 2014 Aug 15;6(8):275-88.

21. Hammad H, Al-Sayyed L, Theivanayagam S, Nguyen V, Rawlings A, Bechtold M. Impacted bone fragment in a small bowel diverticulum: An extremely rare cause of obscure GI bleeding. Endoscopy. 2014;46 Suppl 1 UCTN:E262.

22. Hammad H, Kaltenbach T, Soetikno R. Endoscopic submucosal dissection for esophagus lesions. Curr Gastroenterol Rep. 2014;16(5):386.

23. Prophylactic tracheal intubation for upper GI bleeding: A meta-analysis. Ashraf A Almashhrawi, Rubayat Rahman, Samuel T Jersak, Akwi W Asombang, Alisha M Hinds, HT Hammad, Douglas L Nguyen, Matthew L Bechtold. World J Meta-Anal. 2015 February 26; 3(1): 4-10.

24. Mir F, Bechtold ML, Holly JS, Hammad H. Celiac disease presenting with acquired acrodermatitis enteropathica. Am J Gastroenterol. 2015 Oct;110(10):1396.

25. H. Hammad, Tonya Kaltenbach, Roy Soetikno. Surveillance for dysplasia in inflammatory bowel disease: it is time to move forward. Endoscopy. Endoscopy. 2017 Feb;49(2):110-112. 

26. H. Hammad, Tonya Kaltenbach, Roy Soetikno. Image-enhanced endoscopy: How far do we need to go? Gastrointest Endosc. 2017 Oct;86(4):698-699.

27. Mittal C, Obuch JC, Hammad H, et al. Technical feasibility, diagnostic yield, and safety of micro forceps biopsies during EUS evaluation of pancreatic cystic lesions (with video). Gastrointest Endosc. 2018 Jan 5. S0016-5107(18)30011-7.

28. Brimhall B, Hammad H, Shah RJ , et al. Increased Incidence of Pseudoaneurysm Bleeding With Lumen-Apposing Metal Stents Compared to Double-Pigtail Plastic Stents in Patients With Peripancreatic Fluid Collections. Clin Gastroenterol Hepatol. 2018 Sep;16(9):1521-1528.

29. Machicado JD, Hammad HT, Wani S, et al. A Survey of Expert Practice and Attitudes Regarding Advanced Imaging Modalities in Surveillance of Barrett's Esophagus. Dig Dis Sci. 2018 Sep 3. doi: 10.1007/s10620-018-5257-3.

30. Han S, Hammad H, Wani S, et al. Dysplasia severity is associated with poor quality of life in patients with Barrett's esophagus referred for endoscopic eradication therapy. Dis Esophagus. 2018 Aug 28. doi: 10.1093/dote/doy086.

31. Wani S, Hammad HT, Early D, et al. Competence in Endoscopic Ultrasound and Endoscopic Retrograde Cholangiopancreatography, from Training Through Independent Practice. Gastroenterology. 2018 Jul 26. pii: S0016-5085(18)34812-1.

32. Soetikno R, Ishii N, Kolb JM, Hammad H, Kaltenbach T. The Role of Endoscopic Hemostasis Therapy in Acute Lower Gastrointestinal Hemorrhage. Gastrointest Endosc Clin N Am. 2018 Jul;28(3):391-408.

33. Wani S, Hammad HT, Keswani R, et al. Setting minimum standards for training in EUS and ERCP: results from a prospective multicenter study evaluating learning curves and competence among advanced endoscopy trainees. Gastrointest Endosc. 2019 Feb 7. pii: S0016-5107(19)30073-2.

34. Han S, Hammad HT, Attwell AR et al. A Comparison of Endoscopic Retrograde Pancreatography With or Without Pancreatoscopy for Removal of Pancreatic Duct Stones. Pancreas. 2019 May/Jun;48(5):690-697.

35. Machicado JD, Hammad HT, Wani S, et al. Endoscopic Ultrasound Placement of Preloaded Fiducial Markers Shortens Procedure Time Compared to Back-Loaded Markers. Clin Gastroenterol Hepatol. 2019 Apr 28.

36. Hammad H, Brauer B, Shah R et al. Treating Biliary-Enteric Anastomotic Strictures with Enteroscopy-ERCP Requires Fewer Procedures than Percutaneous Transhepatic Biliary Drains. Dig Dis Sci. 2019 May 25.

37. A Duloy, H Hammad, R Shah. An adverse event of EUS-directed transgastric ERCP: stent-in-stent technique to bridge the peritoneal gap. VideoGIE. 2019 Sep 6;4(11):508-511.

38. J Kolb, H Hammad. The Use of the Overstitch to Close Endoscopic Resection Defects. Gastrointestinal Endoscopy Clinics of North America. Gastrointest Endosc Clin N Am. 2020 Jan;30(1):163-171.

39. Hammad H, R Shah. Letter to the editor: EnteroscopyERCP Cannot Replace the Role of Percutaneous Transhepatic Biliary Drains in Treating BiliaryEnteric Anastomotic Strictures. Dig Dis Sci. 2019.

40. J Yang, H Hammad, M Khashab et al. Safety and efficacy of the use of lumen-apposing metal stents in the management of postoperative fluid collections: a large, international, multicenter study. Endoscopy 2019 Aug;51(8):715-721.

41. Han S, Cristin D, Reveille RM, Hammad HT. Large Gastric Lipoma With Lipomatous Ulceration Resulting in Gastrointestinal Bleeding Managed With Endoscopic Submucosal Dissection. ACG Case Rep J. 2019 Sep 5;6(8).

42. Han S, Wani S, Kaltenbach T, Soetikno R, Hammad H. Endoscopic suturing for closure of endoscopic submucosal dissection defects. VideoGIE. VideoGIE. 2019 Jun 27;4(7):310-313.

43. Han S, Hammad HT, Shah RJ et al. Combination of ERCP-Based Modalities Increases Diagnostic Yield for Biliary Strictures. Dig Dis Sci. 2020 May 19. doi: 10.1007/s10620-020-06335.

44. Wani S, Hammad HT, Komanduri S et al. Recurrence Is Rare Following Complete Eradication of Intestinal Metaplasia in Patients With Barrett's Esophagus and Peaks at 18 Months. Clin Gastroenterol Hepatol. 2020 Jan 23:S1542-3565(20)30098-7.

45. Han S, Wani S, Edmundowicz S, Soetikno R, Hammad H. Feasibility of Endoscopic Suturing to Prevent Adverse Events and Hospitalization after Endoscopic Submucosal Dissection. Endosc Int Open. 2020 Sep;8(9):E1212-E1217.

46. Kolb J, Wani S, Aihara H, Cornish T, Hammad H. Severe submucosal fibrosis and granuloma complicating endoscopic submucosal dissection; unintended consequences of a lifting agent. Gastrointest Endosc. 2021 Feb;93(2):524-526.

47. Kolb J, Wani S, Edmundowicz S, Soetikno R, Hammad H. “Endoscopic submucosal dissection for early esophageal and gastric neoplasia in decompensated cirrhosis with varices". Endoscopy. 2021 Apr;53(4):E128-E129.

48. Han S, Hammad H, Wagh M. “High Prevalence of Musculoskeletal Symptoms and Injuries in Third Space Endoscopists: An International Multicenter Survey". Endosc Int Open. 2020 Oct;8(10):E1481-E1486.

49. J Kolb, H Hammad, M Wagh et al. Efficacy and safety of peroral endoscopic myotomy after prior sleeve gastrectomy and gastric bypass surgery. World Journal of Gastrointestinal Endoscopy. World J Gastrointest Endosc. 2020 Dec 16;12(12):532-541.

50. Soetikno R, Hammad H, Triadafilopoulos G. Letter to the Editor in Response to "Endoscopic Recognition and Management Strategies for Malignant Colorectal Polyps: Recommendations of the US Multi-Society Task Force on Colorectal Cancer". Gastroenterology. 2020 Dec 30.

51. Soetikno R, Hammad H, Triadafilopoulos G.  Use of the ACES (Appearance, Classification, Enhanced endoscopy, and Safe resection) algorithm for the recognition and management of malignant polyps-a letter in response to the Multi-Society Task Force on Colorectal Cancer recommendations. Gastrointest Endosc. 2021 May;93(5):1194-1198.

52. Soetikno R, Hammad H, Triadafilopoulos G.  Use of the ACES (Appearance, Classification, Enhanced endoscopy, and Safe resection) algorithm for the recognition and management of malignant polyps-a letter in response to the Multi-Society Task Force on Colorectal Cancer recommendations. Am J Gastroenterol. 2021 Jul 1;116(7):1562-1563.

53. Han S, Hammad HT, Shah RJ. Adverse Events Associated With Therapeutic Endoscopic Retrograde Pancreatography. Pancreas. 2021 Mar 1;50(3):378-385.

54. Kastelowitz N, Hammad H, Goodman KA. Impact of Radiation Dose on Postoperative Complications in Esophageal and Gastroesophageal Junction Cancers. Front Oncol. 2021 Mar 10;11:614640.

55. Abbitt D, Hammad HT, Jones EL. Endoluminal vacuum closure of a duodenal perforation. J Surg Case Rep. 2021 Nov 5;2021(11).

57. Mittal C, Hammad HT, Komanduri S. Threshold evaluation for optimal number of endoscopic treatment sessions to achieve complete eradication of Barrett's metaplasia. Endoscopy. 2022 Oct;54(10):927-933.

58. Hong ES, Hammad, H, AIsner, DL. Tissue Displacement Versus Two Primary Colorectal Carcinomas? A Case Report on the Utility of Comparative Sequencing. JCO Precision Oncology. 2022 Oct 14;6:e2200252. 

59. Muething, L, Hammad HT, Patel, S. Adoption of Optimal Small (6-9 mm) Colorectal Polyp Resection Technique Over Time. Dig Dis Sci. 2023 Jan;68(1):240-251.

60. Dayyeh BKA, Hammad HT, Willingham FF. Combined Drainage and Protocolized Necrosectomy Through a Coaxial Lumen-apposing Metal Stent for Pancreatic Walled-off Necrosis: A Prospective Multicenter Trial. Ann Surg May 2023.

61. Kaltenbach, T, Hammad H, Wani, S. Varied Trainee Competence in Cold Snare Polypectomy: Results of the COMPLETE Randomized Controlled Trial. Am J Gastroenterol. 2023 Oct 1;118(10):1880-1887.

62. Abbitt D, Hammad HT, Jones EL. Losing weight to achieve joint or hernia surgery: is the intragastric balloon the answer? Surg Endosc, 2023 Sep;37(9):7212-7217.

63. Han S, Hammad HT, Shah RJ. The timing of recurrence after endoscopic papillectomy. Surg Endosc. 2024 Feb.

64. Han S, Hammad HT, Shah RJ. The Impact of Pancreatic Endotherapy on Quality of Life in Chronic Pancreatitis. Gastrointest Endosc. 2024 Dec 9:S0016-5107(24)03775.

• Wayne State University: Intern of the Year for Excellence in Patient Care and Education
• Wayne State University: Professionalism Award for Commitment to Exceptional Humanistic Qualities
• University of Jordan: Certificate of Excellence for Highest Academic Achievement
• Medical School Full Scholarship: Higher Education Council of Jordan
• Excellence in Teaching: Honored by 4th-Year Medical Students
• Dean’s Honor List: Every Year in Medical School
• Diagnostic Challenge Team: First Place, Michigan
• Resident Council Member: Elected by Fellow Residents, Wayne State University
• Best In-Training Exam Score: Program Director’s Award, Wayne State University
• Chief Medicine Resident: Wayne State University
• Chief Gastroenterology Fellow: University of Missouri
• ACG Press Release Selection: Abstract on Malnutrition Post-Gastric Bypass Surgery
• ASGE Don Wilson Award: Cook Medical
• Fellow of the American Society for Gastrointestinal Endoscopy (FASGE)

• Advanced Therapeutic Endoscopy
• Endoscopic Submucosal Dissection (ESD)
• Peroral Endoscopic Myotomy (POEM) for Zenker’s Diverticulum, Achalasia, and Gastroparesis
• Advanced Imaging Techniques (NBI, Dye Chromoendoscopy, OCT, CLE)
• Endoscopic Mucosal Resection (EMR)
• Endoscopic Suturing and Full-Thickness Closure
• Endoscopic Sleeve Gastroplasty (ESG)
• ERCP (including altered anatomy ERCP)
• Cholangioscopy and Pancreatoscopy
• Interventional Endoscopic Ultrasound (EUS)
• EUS-Guided Interventions (Choledochoduodenostomy, Gastrojejunostomy, Variceal Coiling, Glue Injection)
• Cryotherapy and Radiofrequency Ablation
• Capsule Enteroscopy and Device-Assisted Enteroscopy
• EndoFLIP (Endoluminal Functional Lumen Imaging Probe)
• Transoral Incisionless Fundoplication (TIF) for Reflux Management