Gastroenterology Prof. Dr. Yaşar Çolak
✓ Medically verified profileProf. Dr. Yaşar Çolak
✓ Medically verified profile
Quick answer
Prof. Dr. Yaşar Çolak is a gastroenterology specialist at Acıbadem Ataşehir Hospital. He treats pancreatic, liver and biliary tract diseases, as well as digestive disorders such as reflux, gastritis and dyspepsia. His key areas of practice include ERCP, endoscopic sleeve gastroplasty and swallowing disorders.
About Prof. Dr. Yaşar Çolak
Prof. Dr. Yaşar Çolak is a gastroenterology specialist at Acıbadem Ataşehir Hospital, with clinical interests in pancreatic, liver and biliary tract diseases, obesity management and digestive system disorders. His practice includes ERCP, endoscopic sleeve gastroplasty, swallowing disorders, reflux, gastritis and dyspepsia.
He graduated from Istanbul University Istanbul Faculty of Medicine in 2002 and completed Internal Medicine training there in 2008, followed by Gastroenterology training at Istanbul Göztepe Training and Research Hospital in 2011. His further training includes endoscopic ultrasound education at the Academic Medical Center, University of Amsterdam, liver transplantation training at Florence Nightingale Hospital, and advanced endoscopy training at Cleveland Clinic Florida.
International patients can expect a gastroenterology assessment focused on their individual symptoms and clinical needs, including conditions affecting the pancreas, liver, bile ducts and digestive tract. Prof. Dr. Çolak’s experience in advanced endoscopic applications supports evaluation and treatment planning for appropriate patients.
Areas of Expertise
Conditions treated and procedures performed by this specialist.
Subspecialties
- Treatment of Pancreas, Liver and Biliary Tract Diseases
Education
- 2019–2020Cleveland Clinic Florida, Department of Advanced Endoscopic Applications (United States of America)
- 2016Bezmialem Vakıf Gureba Hospital, Division of Gastroenterology, ERCP and Endoscopic Ultrasonography
- 2015–2016Cleveland Clinic Florida, Department of Advanced Endoscopic Applications (United States of America)
- 2014Florence Nightingale Hospital, Liver Transplantation Unit
- 2013Academic Medical Center (AMC), University of Amsterdam, Netherlands. European Postgraduate School, Endoscopic Ultrasound (EUS) Training
- 2011İstanbul Göztepe Training and Research Hospital, Gastroenterology
- 2008İstanbul University İstanbul Faculty of Medicine, Internal Medicine
- 2002İstanbul University İstanbul Faculty of Medicine
Professional Experience
- 2025Acıbadem Healthcare Services
- 2024Acıbadem Healthcare Services
- 2022–2025Memorial Ataşehir and Şişli Hospitals, Gastroenterology Clinic
- 2020–2022Medicana Ataşehir Hospital
- 2018–2020İstanbul Medeniyet Universitesi Faculty of Medicine, Division of Gastroenterology (Professor)
- 2016–2019Presidential Health Coordination Office
- 2013–2018İstanbul Medeniyet Universitesi Faculty of Medicine, Division of Gastroenterology (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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A dedicated team, from first message to follow-up
Our international patient office coordinates your appointment, travel and treatment across the Acıbadem network — including 7 JCI-accredited hospitals — and stays with you in your own language, every step of the way.
Schedule your appointment with Prof. Dr. Yaşar Çolak
Choose a date and time that suits you. Our international patient team will check availability and confirm your appointment — usually within 24 hours.
- 1Choose your date & timePick a preferred day and time slot for your visit.
- 2Share your detailsTell us how to reach you and anything we should know.
- 3We confirm with youOur team confirms the appointment by phone or email.
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Your information stays strictly confidential and is used only to arrange your care.
Hospitals
Medical Units
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.”
“After struggling for a long time, I finally found the right care for my stroke rehabilitation here. Dr. Çolak explained every step clearly and never rushed me.”
“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.”