Gastroenterology Prof. Dr. Yaşar Çolak
✓ Medically verified profileProf. Dr. Yaşar Çolak
✓ Medically verified profile
About Prof. Dr. Yaşar Çolak
Quick answer
Prof. Dr. Yaşar Çolak is a gastroenterologist at Acibadem Ataşehir Hospital in İstanbul with 13+ years of experience.
He treats nonalcoholic fatty liver disease, nonalcoholic steatohepatitis, hepatocellular carcinoma recurrence after liver transplantation, large gastrointestinal lesions, dumping syndrome, gastrointestinal bleeding, and impaired gallbladder motility, and performs endoscopic mucosal resection, ERCP, endoscopic ultrasound, balloon-assisted enteroscopy, and endoscopic hemoclip therapy. He consults in Turkish and English and offers online video consultation.
Prof. Yaşar Çolak is a highly trained gastroenterologist and hepatologist with advanced endoscopic expertise. He completed specialized advanced endoscopic training at Cleveland Clinic Florida (Department of Advanced Endoscopic Applications) in 2019–2020.
He currently practices with Acibadem Health Group (2024), where he applies state-of-the-art endoscopic techniques and comprehensive liver and gastrointestinal care. His professional memberships include the American Gastroenterology Association (AGA), the European Association for the Study of the Liver (EASL), the Turkish Association for the Study of the Liver, the Turkish Society of Gastroenterology, and the European Association for Gastroenterology, Endoscopy and Nutrition (EAGEN), reflecting a strong commitment to international standards and ongoing professional development.
Areas of Expertise
Conditions treated and procedures performed by this specialist.
Education
- 2019–2020Cleveland Clinic Florida, Department of Advanced Endoscopic Applications (United States)
- 2016Department of Gastroenterology, Bezmialem Vakıf Gureba Hospital, ERCP and Endoscopic Ultrasonography
- 2015–2016Cleveland Clinic Florida, Department of Advanced Endoscopic Applications (United States)
- 2014Florence Nightingale Hospital, Liver Transplantation Unit
- 2013Academic Medical Center (AMC), University of Amsterdam, The Netherlands. European Postgraduate School, Endoscopic Ultrasound (EUS) Training
- 2011Gastroenterology at Istanbul Goztepe Training and Research Hospital
- 2008Istanbul University Istanbul Faculty of Medicine Internal Medicine
- 2002Istanbul University Istanbul Faculty of Medicine
Professional Experience
- 2024Acibadem Health Group
- 2022–2025Memorial Ataşehir and Şişli Hospitals, Gastroenterology Clinic
- 2020–2022Medicana Atasehir Hospital
- 2018–2020Department of Gastroenterology, Istanbul Medeniyet University Faculty of Medicine (Professor)
- 2016–2019Presidential Health Coordinatorship
- 2013–2018Department of Gastroenterology, Istanbul Medeniyet University Faculty of Medicine (Associate Professor)
Professional Memberships
- American Gastroenterology Association (AGA)
- European Association for the Study of the Liver (EASL)
- Turkish Association for the Study of the Liver
- Turkish Society of Gastroenterology
- The European Association for Gastroenterology, Endoscopy and Nutrition (EAGEN)
Selected Publications
- Risk factors for local recurrence of large gastrointestinal lesions after endoscopic mucosal resection. Tech Coloproctol. 2022 Jul;26(7):545-550. doi: 10.1007/s10151-022-02623-y. Epub 2022 May 2. PMID: 35499748. Colak Y, Hasan B, Hassaballa W, Ur Rashid M, Strassmann V, DaSilva G, Wexner SD, Erim T.
- Early Detection of Hepatocellular Carcinoma Recurrence in the Posttransplant Population: A Comparison of RETREAT and Cleveland Clinic Florida Scoring System. Transplant Proc. 2021 Jan-Feb;53(1):193-199. doi: 10.1016/j.transproceed.2020.09.015. Epub 2020 Oct 14. PMID: 33069486 Hasan B, Colak Y, Khalid RA, Castillo M, Castaneda D, Tandon K, Shaw JJ, Erim T, Zervos XB, Castro FJ, Al-Khalloufi K.
- Pathogenetic mechanisms of nonalcoholic fatty liver disease and inhibition of the inflammasome as a new therapeutic target. Clin Res Hepatol Gastroenterol. 2021 Jul;45(4):101710. doi: 10.1016/j.clinre.2021.101710. Epub 2021 Apr 27. PMID: 33930586. Colak Y, Hasan B, Erkalma B, Tandon K, Zervos X, Menzo EL, Erim T.
- Visceral Adiposity Index As a Practical Tool in Patients with Biopsy-Proven Nonalcoholic Fatty Liver Disease/Nonalcoholic Steatohepatitis. Metab Syndr Relat Disord. 2021 Feb;19(1):26-31. doi: 10.1089/met.2020.0054. Epub 2020 Sep 7. PMID: 32898457 Vural Keskinler M, Mutlu HH, Sirin A, Erkalma Senates B, Colak Y, Tuncer I, Oguz A.
- An Alternative Method for Treating Dumping Syndrome Using Hemoclips. Cureus. 2021 May 6;13(5):e14869. doi: 10.7759/cureus.14869. PMID: 34113505; PMCID: PMC8177030. Yavuz A, Akan K, Ulaşoğlu C, Tuncer İ, Çolak Y.
- Pathogenetic mechanisms of nonalcoholic fatty liver disease and inhibition of the inflammasome as a new therapeutic target. Colak Y, Badar H, Erkalma B, Kanwarpreet T, Xaralambos Z, Emanuele LM, Erim T.
- Utility and safety of balloon-assisted enteroscopy in patients with left ventricular assist devices: a retrospective multicenter study. Endosc Int Open. 2020 Aug;8(8):E1002-E1008. doi: 10.1055/a-1181-8340. Epub 2020 Jul 21. PMID: 32743049; PMCID: PMC7373663 Hasan BM, McMahon C, Khalid RA, Colak Y, Mayorga DC, Elkafrawy A, Tandon K, Shafiq M, Hussain I, Erim T, Castro F, Charles R, Chhabra R
- Recurrent Gastrointestinal Bleeding in an HIV-Positive Patient: A Case Report. Cureus. 2020 Sep 27;12(9):e10688. doi: 10.7759/cureus.10688. PMID: 33133853; PMCID: PMC7593209. Yavuz A, Toksöz Yildirim AN, Akan K, Colak Y, Tuncer I.
- Assessment of the rs2645424 C/T single nucleotide polymorphisms in the FDFT1 gene, hepatic expression, and serum concentration of the FDFT in patients with nonalcoholic fatty liver disease Meta Gene. 2018 Dec;18:46-52. doi: 10.1016/j.mgene.2018.07.006 Colak Y, Coskunpinar E, Senates E, Musteri Oltulu Y, Yaylim I, Kurnaz Gomleksiz O, Tiryakioglu NO, Hasturk B, Ekmekci CG, Yilmaz Aydogan H.
- mpaired Gallbladder Motility and Increased Gallbladder Wall Thickness in Patients with Nonalcoholic Fatty Liver Disease. J Neurogastroenterol Motil. 2016 Jul 30;22(3):470-6. doi:10.5056/jnm15159. PubMed PMID: 26932908; PubMed Central PMCID: PMC4930302 Colak Y, Bozbey G, Erim T, Caklili OT, Ulasoglu C, Senates E, Mutlu HH, Mesci B, Dogan MS, Tasan G, Enc FY, Tuncer I.
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Treatments Performed
What patients say about Prof. Dr. Yaşar Çolak
★★★★★From 2,400+ verified patient reviews“My Crohn's management exceeded every expectation I had. Prof. Dr. Çolak listened carefully and built a plan I understood. The facilities were spotless and modern.”
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“I travelled from abroad for CT scan and the whole experience was seamless. Dr. Çolak made a stressful situation feel completely manageable.”
“I travelled from abroad for vision correction and the whole experience was seamless. Dr. Çolakoğlu was thorough, professional and genuinely caring. The facilities were spotless and modern.”