Assoc. Prof. MD. Orhan Uzun

Education and Specialty Training

• İstanbul University Cerrahpaşa Faculty of Medicine – Medical Education

• S.B. Göztepe Training and Research Hospital – General Surgery Residency

• S.B. Koşuyolu High Specialization Training and Research Hospital – Gastroenterology Surgery Fellowship

Professional Experience

• 2001–2006: S.B. Göztepe Training and Research Hospital – General Surgery Residency

• 2006–2008: İstanbul Tuzla State Hospital – General Surgery Department

• 2008–2009: Presidential Guard Regiment Dispensary

• 2009–2010: İstanbul Tuzla State Hospital – General Surgery Department

• 2010–2011: Kocaeli Gebze Fatih State Hospital – General Surgery Department

• 2011–2014: S.B. Koşuyolu High Specialization Training and Research Hospital – Gastroenterology Surgery Fellowship

• 2014–2020: S.B. Koşuyolu High Specialization Training and Research Hospital – Gastroenterology Surgery Specialist

• 2020–2021: S.B. Koşuyolu High Specialization Training and Research Hospital – Gastroenterology Surgery Senior Assistant

• 2021–2025: S.B.Ü. Koşuyolu High Specialization Training and Research Hospital – Associate Professor, Gastroenterology Surgery

Courses and Certifications

• March 20–21, 2015: Advanced Interventional Endoscopy Workshop, Acıbadem University

• July 11, 2016 – January 13, 2017: Endoscopic Retrograde Cholangiopancreatography (ERCP) Training, S.B. Bakırköy Dr. Sadi Konuk Training and Research Hospital

Professional Memberships

• Turkish Surgical Society

• Gastroenterological Surgery Society

• Hepatobiliary Surgery Society

• Colorectal Surgery Society

• National Gastric Cancer Society

International Peer-Reviewed Publications

• Uzun O, Yasar NF, Akyuz C, Peker KD, Sehirli AO, Cetinel S, Duman M, Polat E. Effects of ghrelin on colonic anastomosis following radiotherapy. Int J Clin Exp Med. 2016;9(8):16529–16534. ISSN: 1940-5901

• Uzun O, Senger AS, Gulmez S, Ofluoglu CB, Oz A, Omeroglu S, Polat E, Duman M. Incidence and Prognostic Significance of Signet Ring Cell Histology in Gastric Cancer: A Cross-Sectional Study in Turkey. Iran Red Crescent Med J. 2020;22(9):e34.

• Uzun O, Gulmez S, Senger AS, Percem A, Polat E, Duman M. Prognostic Factors in Operated T3-T4 Gastric Cancer. J Coll Physicians Surg Pak. 2020;30(10):1047–1052.

• Uzun O, Gulmez S, Senger AS, Omeroglu S, Polat E, Duman M. Prognostic effect of perineural invasion in locally advanced gastric cancer. Indian J Pathol Microbiol. 2021; DOI: 10.4103/IJPM.IJPM_612_20

• Duman M, Polat E, Ozer M, Demirci Y, Yasar NF, Akyuz C, Uzun O, Peker KD, Genc E, Yol S. The Effect of Rabeprazole on LES Tone in Experimental Rat Model. J Investig Surg. 2013;26:186–190. DOI: 10.3109/08941939.2012.733487

• Polat E, Duman U, Duman M, Peker KD, Akyuz C, Yasar NF, Uzun O, Akbulut S, Bostanci EB, Yol S. Preoperative serum tumor marker levels in gastric cancer. Pak J Med Sci. 2014;30(1):145–149. DOI: 10.12669/pjms.301.3968

• Yasar NF, Polat E, Duman M, Dagdelen M, Gunal MY, Uzun O, Akyuz C, Peker KD, Yol S. In vitro effects of rabeprazole on human pylorus tone. J Neurogastroenterol Motil. 2015;21(2).

• Peker KD, Ozkanli SS, Akyuz C, Uzun O, Yasar NF, Duman M, Yol S. Preoperative immunonutrition regulates tumor infiltrative lymphocytes and increases tumor angiogenesis in gastric cancer patients. Arch Med Sci. DOI: 10.5114/aoms.2016.60054

• Argın V, Ozduman MÖ, Sunar AO, Dincer M, Senger AS, Gulmez S, Uzun O, Duman M, Polat E. The Effect of Different Intraperitoneal Hyperthermic Chemotherapy (HIPEC) Regimens on Serum Electrolyte Levels: A Comparison of Oxaliplatin and Mitomycin C. Medicina. 2025;61:1345.

• Aydin IC, Torun M, Sönmez MR, Ademoğlu S, Sunar AO, Uzun O, Gulmez S, Polat E, Duman M. The Influence of Mucinous Histology on the Prognosis of Stage II and III Colorectal Cancers. Medicina. 2025;61(3):456. DOI: 10.3390/medicina61030456

• Havan N, Gulmez S, Senger AS, Uzun O, Dincer M, Ozduman Ö, Avan D, Polat A, Polat E, Duman M. Influence of sarcopenia on postoperative major complications after cytoreductive surgery and hyperthermic intraperitoneal chemotherapy in patients with peritoneal surface malignancy: a retrospective cohort study. Int J Colorectal Dis. 2025;40:96.

• Omeroglu S, Gulmez S, Uzun O, Senger AS, Bostanci O, Guven O, Polat E, Duman M. Clinical significance of the histopathological metastatic largest lymph node size in colorectal cancer patients. Front Oncol. 2023;6 March.

• Gulmez S, Polat E, Duman U, Senger AS, Uzun O, Ozduman Ö, Oz A, Subasi IE, Duman M. Hepatic bridge and round ligament of the liver during cytoreductive surgery: A retrospective cohort. Langenbeck’s Arch Surg. 2022;5.