Dr. Sawas completed his internal medicine training at Georgetown University Washington Hospital Center. Drawn by the opportunity to perform a vast array of diagnostic and therapeutic procedures to contribute to the health and wellbeing of patients, he completed his Gastroenterology fellowship at the Mayo Clinic, Rochester, MN. Subsequently, he dedicated an additional year to train in advanced endoscopy at the Mayo Clinic which equipped him with the necessary skills to endoscopically treat patients with gastrointestinal cancer and obesity.

Dr. Sawas brings to UTSW a strong background in therapeutic endoscopy and malignant gastrointestinal disorders. He specializes in pancreaticobiliary diseases, bariatric endoscopy, esophageal cancer and endoscopic resection. His clinical practice includes endoscopic retrograde cholangiopancreatography (ERCP), endoscopic ultrasound (EUS), endoscopy to treat weight gain such as endoscopic sleeve gastroplasty (ESG), transoral outlet reduction (TORe) in patients with weight regain after weight loss surgery (Roux-en-Y gastric bypass) and endoscopic mucosal resection to treat early cancer in a minimally invasive way.

Dr Sawas has additional training in clinical research. He completed a Master of Public Health and epidemiology at Harvard University. He is the receiver the American Gastroenterology Association (AGA) early career investigator and the 2019 Summerskill’s award from the Mayo Clinic which recognizes outstanding research achievement. He has published extensively in prestigious journals on esophageal cancer, bile duct cancer and bariatric endoscopy. He also servs as a reviewer to multiple journals.

Dr Sawas decision to join UTSW was mainly driven by his passion to serve patients, educate the next generation of doctors and perform cutting edge research. He was driven by the collaborative multidisciplinary team approach which is focused on assuring best care and putting patients’ interest above all. He was attracted to the intuitional support and infrastructure which nourished physicians and scientists to pursue the highest level of impactful research.

Dr. Sawas interests outside of medicine include his family, tennis, and hiking.


Medical School
Damascus University School of Medicine, Syria (2010)
Washington Hospital Center/Georgetown University Hospital (2014), Internal Medicine
Graduate School
Harvard T.H. Chan School of Public Health (2017)
Other Post Graduate Training
Harvard University T.H Chan School of public health (2017)
Mayo Clinic College of Medicine and Science (2019), Gastroenterology

Research Interest

  • Bariatric Endoscopy Outcomes
  • Esophageal Cancer Risk Factors and Treatment
  • Pancreaticobiliary Cancer


Featured Publications LegendFeatured Publications

Cholangioscopy Biopsies Improve Detection of Cholangiocarcinoma When Combined with Cytology and FISH, but Not in Patients with PSC.
Kaura K, Sawas T, Bazerbachi F, Storm AC, Martin JA, Gores GJ, Abu Dayyeh BK, Topazian MD, Levy MJ, Petersen BT, Chandrasekhara V, Dig. Dis. Sci. 2020 May 65 5 1471-1478
An innovative technique using a percutaneously placed guidewire allows for higher success rate for ERCP compared to balloon enteroscopy assistance in Roux-en-Y gastric bypass anatomy.
Sawas T, Storm AC, Bazerbachi F, Fleming CJ, Vargas EJ, Chandrasekhara V, Andrews JC, Levy MJ, Martin JA, Petersen BT, Topazian MD, Abu Dayyeh BK, Surg Endosc 2020 02 34 2 806-813
Comparison of Phenotypes and Risk Factors for Esophageal Adenocarcinoma at Present vs Prior Decades.
Sawas T, Azad N, Killcoyne S, Iyer PG, Wang KK, Fitzgerald RC, Katzka DA, Clin. Gastroenterol. Hepatol. 2019 Nov
Young Adults With Esophageal Adenocarcinoma Present With More Advanced Stage Tumors and Have Shorter Survival Times.
Sawas T, Manrique GC, Iyer PG, Wang KK, Katzka DA, Clin. Gastroenterol. Hepatol. 2019 08 17 9 1756-1762
Persistent intestinal metaplasia after endoscopic eradication therapy of neoplastic Barrett's esophagus increases the risk of dysplasia recurrence: meta-analysis.
Sawas T, Alsawas M, Bazerbachi F, Iyer PG, Wang KK, Murad MH, Katzka DA, Gastrointest. Endosc. 2019 05 89 5 913-925.e6
Identification of Prognostic Phenotypes of Esophageal Adenocarcinoma in 2 Independent Cohorts.
Sawas T, Killcoyne S, Iyer PG, Wang KK, Smyrk TC, Kisiel JB, Qin Y, Ahlquist DA, Rustgi AK, Costa RJ, Gerstung M, Fitzgerald RC, Katzka DA, Gastroenterology 2018 12 155 6 1720-1728.e4
Higher Rate of Barrett's Detection in the First Year After Successful Endoscopic Therapy: Meta-analysis.
Sawas T, Iyer PG, Alsawas M, Cotton CC, Leggett CL, Murad MH, Wang KK, Shaheen NJ, Katzka DA, Am. J. Gastroenterol. 2018 07 113 7 959-971
Bariatric Surgery Is Acceptably Safe in Obese Inflammatory Bowel Disease Patients: Analysis of the Nationwide Inpatient Sample.
Bazerbachi F, Sawas T, Vargas EJ, Haffar S, Deepak P, Kisiel JB, Loftus EV, Abu Dayyeh BK, Obes Surg 2018 04 28 4 1007-1014
Metal stents versus plastic stents for the management of pancreatic walled-off necrosis: a systematic review and meta-analysis.
Bazerbachi F, Sawas T, Vargas EJ, Prokop LJ, Chari ST, Gleeson FC, Levy MJ, Martin J, Petersen BT, Pearson RK, Topazian MD, Vege SS, Abu Dayyeh BK, Gastrointest. Endosc. 2018 Jan 87 1 30-42.e15
Self-expandable metal stents versus plastic stents for malignant biliary obstruction: a meta-analysis.
Sawas T, Al Halabi S, Parsi MA, Vargo JJ, Gastrointest. Endosc. 2015 Aug 82 2 256-267.e7

Honors & Awards

  • William H. Summerskill Outstanding Research Award
    Mayo Clinic Department of Medicine (2019)
  • Early Career Investigator
    American Gastroenterology Association (2018)
  • Excellence in Research Award
    Medstar Research Institute (2014)

Professional Associations/Affiliations

  • American College of Gastroenterology (2017)
  • American Society of Gastrointestinal Endoscopy (2016)
  • American Gastroenterology Association (2015)