Specializations
Cancer Surgery
Pancreatic Surgery
Bile Duct Surgery
Bariatric Metabolic Surgery
Oncological Surgery
Breast Surgery
Gastric cancer
Colon cancer
Thyroid Cancer
Obesity Surgery
Diabetes Surgeries
Gastroenterology
Pendik Medipol University Hospital
1999 Karadeniz Technical University, Gastroenterology
1997 Atatürk University, Internal Diseases Professorship
1992 Atatürk University, Internal Diseases Associated Professorship
1985 Atatürk University, Internal Diseases Specialist
1981 Atatürk University Faculty of Medicine
1- Nihat Okçu Gülçin Polat, Arif Yılmaz, Mehmet Koruk, The demographic features of gastric cancers in Erzurum(Eurasian J Med 2000; 32: 63-65)
2- An Evaluation of Upper Gastrointestinal Bleeding Cases. Clinical Sciences-Doctor.2000, - E.akarsu,N.Okçu,et Ark.Northeast Anatolia 6:4:435-438
3-N.Okçu, A.yılmaz. İ.kiki,MDonuk, C.gündoğdu, H.uzunismail. Our Diagnostic Upper Gastrointestinal Endoscopy Results. Atatürk University Medical Journal 1997,29 (2):486
4-N. Okçu, M.gündoğdu, MD onuk, İ.kiki, l.cerrahoğlu, k.yılmaz, I. çapoğlu. The Role of Misoprostol in Preventing Gastroduodenal Lesions in Patients Using Nonsteroidal Anti-Inflammatory Drugs (NSAIDs). Atatürk University Medical Journal 1997,29 (2):453-455.
5-N.Okçu, A. Öz, MD Onuk, E.Akarsu, B. Tekin, Hz Tonbul, H.Kaya. Plasma Fibronectin Levels in Chronic Active Hepatitis and Decoction of Liver Parenchymal Insufficiency and Their Relationship with Liver Functional Status. Turkish J. Gastroenterol 1995;27(4): 422-426.
6-N.Okçu, Tahir Buran, MD Onuk, A. Yılmaz, E.Akarsu, G. Akçay. Prevalence of Helicobacter Pylori in Patients with Duodenal Ulcer in Erzurum and Surrounding Area. Turkish J. Gastroenterol 1995;27(4): 447-450.
7-N.Okçu, bs awake, e. akarsu, e. bakan, z. tonbul. Importance of Carbohydrate Antigens (CA-19-9, CA-125), Carcinoembryonic Antigen (CEA) and Alkaline Phosphatase in Gastric and Colorectal Cancers. Turkish J. Gastroenterol 1995;6:467-471.
8-N. Okçu, MD Onuk, E. Akarsu, H. Doğan, C. Gündoğdu. Major Risk Factors in Patients with Hepatocellular Carcinoma in Our Region. Gastroenterology 1994;5(2):154-157
9-N.Okçu, md. Onuk, e. akarsu, h. doğan, c.gündoğdu, tahir buran. Frequency of gastric carcinoma in Erzurum region, endoscopic and histological features. Gastroenterology 1994;5(2):263-267.
10-N. Okçu, MD Onuk, Tahir Buran, E. Akarsu, MA Çiftçioğlu. Frequency of Helicobacter Pylori in Nonspecific Gastritis Cases in Erzurum Province. Gastroenterology 1994;5(2):211-213.
11-N.Okçu, MD Onuk, Ö. Ünal, E. Akarsu, L. İncesu, K. Akgöz. Diagnostic Value of Ultrasound-Guided Fine Needle Aspiration Biopsy in Intra-Abdominal Mass Lesions. Gastroenterology 1993;4(1):166-68.
12-NOkçu, md. onuk, m. polat, a. yılmaz, m. gündoğdu, m. paç. Budd-Chiari Syndrome (2 Cases). Turkish J Gastroenterhepatol 1993; 4(1):77-80.
13-N.Okçu, H. Koçak, MD Onuk, M. Gündoğdu, E. Bakan, A. Yılmaz, A. Başoğlu, A. Ateş, F.A. Paç. The Effect of Atrial Pressure Changes and Cardiac Nerves on Plasma Atrial Natriuretic Peptide (ANP) Levels. Vascular Surgery 1993; 27(2): 128-132
15-N.Okçu, MD Onuk, A.Yılmaz, M. Gündoğdu, T. Buran. Effects of Omeprozole and Ranitidine on Peptic Ulcer Healing. Doğa-Tr.J. of Medical Sciences 1992;16:657-658.
16-N. Okçu, Mr. Yiğitoğlu, B. Adam, E. Bakan. The Effect of Digixin on Plasma Atrial Natriuretic Peptic Level in Patients with Congestive Heart Failure. S.Ü. Medical Faculty Journal 1991;7(2):243-247..
17-N.Okçu, A. Yılmaz. The Effect of Histamine H2 -Receptor Antagonists in Upper Gastrointestinal System Bleeding. Endoscopy Journal 1991;2(4):17-23.
18-N.Okçu, E. Bakan, B. Adam, A. Yılmaz, Mr. Yiğitoğlu. Sex Hormones and Sex Hormone Binding Globulin Levels in Patients with Chronic Hepatitis and Liver Cirrhosis (Letter to the Editor). Nature-Tr. J. Of Medical Sciences 1991;15:1-2.
19-N.Okcu Ömer Yılmaz.Helıcobacter pylori and related gastrointestinal system diseases. Turkish Clinics JMed Sci. 2013;33(3):806-13
20-Nihat Okçu, Ömer Yılmaz, Hakan Dursun, Gülçin Polat. The relationship between dyspeptic symptoms, nutritional habits, endoscopic and histological findings (Eurasian J Med 2006; 38: 13-17)
21-Mehmet Bilici,1Nihat Okcu,1Kerim Cayir,1Ibrahim Pirim,2Salim B. Tekin,1andCemal Gundogdu3 - Distribution of HLA Tissue Groups in Patients with Gastric Cancer Eurasian J Med. 2010 Apr; 42(1): 9.11.
22-Nihat Okcu,Abdulhalim Bak,Mehmet Sari,Mehmet Arslan,Sait Kapicioglu:The fibroblast proliferation, relationship of hepatocyte growth factor (HGF) and interferon-A2A Gastroenterology April 2000Volume 118,Issue 4, Part 2, PageA1404
23-Kubra Kaynar,Sait Kapicioglu,Mehmet Sari,Nihat Okcu,Abdulhalim Baki. The effect of fish oil on stress ulcer prophylaxis GastroenterologyVolume 118, Issue 4, Part 2, PageA1255
Medical Interests and Activities
Gastrointestinal diseases
Oncologic laparoscopic surgery
Anorectal area diseases
Urgent surgical cases (acute cholecystitis, divertikülit, ileus, pankreatit, appendicitis)
Colon and rectum cancer
Treatment of oncologic surgical cases with further laparoscopic and robotic surgery.
Laparoscopic hernia surgery
Esophagus and stomach cancer
Selim anorectal diseases (hemorrhoidal disease, anal fissure), perianal fistula, pilonoidal sinus (hairless- non-surgical treatment)
Education and Experience
İstanbul University Medical Faculty 1988
University of Colorado Health Science Center – Intern Surgeon
Isparta, Dedeçam Şehit Ramazan Karaca Health Center (1995-1996)
İstanbul Surgery Hospital – American Hospital (2000-2001)
Chief assistant Istanbul Medical Faculty, Department of General Surgery (2001-2008)
World Congress on Peritonel Surface Malignancies (HIPEC course) Berlin, Germany (2012)
USC Keck School of Medicine, Los Angeles, CA, USA (2006-2007)
Assoc. Prof. M.D. , İstanbul Medical Faculty General Surgery (2008-2014)
Da Vinci Robotic Intensive Course at IRCAD, Strasbourg, France (2011)
Stony Brook Medicine Cadaver Training Event in Colon and Rectal Surgery, New York, USA (2016) (Instructor)
Fellow of the European Board of Surgery- Emergency Surgery (FEBS EmSurg) Honorary Diploma (2017)
Prof. M.D. , İstanbul Medical Faculty General Surgery (2014 -2017)
İstanbul University Medical Faculty – General Surgery Master of Science 1996
University of Southern California Medical Center, Department of General Surgery, Los Angeles, USA – February 2006 – February 2007
Liv Hospital
Memberships
Turkish Society of Surgery
National Endoscopic Laparoscopic Surgery Association
Turkish Colon and Rectum Surgery Association
National Trauma and Emergency Surgery Association
Hepato-Pancreato-Bilier Surgery Association
Istanbul Surgical Association
Flebology Association
ESTES (European Society of Trauma and Emergency Surgery)
International Society of Surgery (ISS)
Dr. Specialist Surgeon Rafail Ibayev is an expert in advanced gastrointestinal surgery. He specializes in both laparoscopic and open procedures for diseases of the stomach, intestine, and rectum. Dr. Ibayev is a recognized leader in obesity and metabolic surgery. He has extensive experience in sleeve gastrectomy, gastric bypass, and gastric balloon procedures. His patients achieve high success rates in weight management and metabolic health.
Dr. Ibayev is known for his work in minimally invasive surgery. He performs a wide range of laparoscopic operations that help patients recover faster and with less scarring. He is also skilled in endocrine and breast surgery, including advanced oncoplastic techniques for both benign and malignant conditions. As a gastrointestinal cancer specialist, he performs complex surgeries for liver, stomach, and colorectal tumors. He provides modern and effective oncological care.
Dr. Ibayev is highly trained in anti-reflux surgery, treatment of digestive disorders, endoscopic procedures, hernia repair, splenectomy, and proctologic surgeries. He is committed to patient-centered care and long-term health outcomes.
Dr. Osman Aktas has been serving as a general surgeon at Ataşehir Avicenna Hospital since 2005. Born in Kayseri in 1960, he graduated with his medical degree from Ankara University in 1983. Following his graduation, he fulfilled his military service in medical units for two years. He completed his general surgery residency at GATA from 1986 to 1990. After specializing in general surgery, He held key positions as head of general surgery departments and chief physician in several prominent military hospitals, including Tatvan, Diyarbakır, Ankara, and Manisa.
Dr. Osman has had a special focus on endoscopic surgery since 1995. He received advanced training in laparoscopic surgery techniques in Germany and has successfully performed a wide range of laparoscopic procedures. His expertise extends to gallbladder surgery, abdominal wall and inguinal hernia repairs, appendicitis, reflux and stomach surgeries, as well as complex cases such as gastrointestinal tumors, intestinal obstructions, and various other intestinal diseases, all managed through minimally invasive methods.
In 2002, Dr. Osman transitioned to the private sector, where he broadened his practice to include modern treatments for anal diseases like hemorrhoids, fistulas, and fissures, utilizing advanced techniques such as laser therapy.
Dr. Osman is also recognized for his significant contributions to oncological surgery. He has a wealth of experience in the surgical treatment of various cancers, including breast and thyroid cancer, where he has implemented new treatment methods that reduce the risk of complications. His surgical expertise spans critical cancer surgeries, such as the Whipple procedure for pancreatic cancer, colorectal cancer resections, gastric cancer, and other complex malignancies. Additionally, his skills in metabolic surgery have led to lasting outcomes for patients suffering from obesity and diabetes, ensuring a better quality of life through sustained weight loss and reduced risk of diabetes.
With his vast experience and advanced skills in both laparoscopic and cancer surgeries, Dr. Osman remains at the forefront of surgical excellence, offering innovative and comprehensive care to all his patients.
Il medico ha 17 anni di esperienza in Chirurgia del Tratto Gastrointestinale Superiore e Chirurgia per la Perdita di Peso, essendo tra i primi in India ad essere addestrato in Banded Bypass, Banded Sleeve Gastrectomy e Mini Gastric Bypass a Los Angeles, USA. Esegue la Sleeve Gastrectomy innovativa con bypass duodeno-digiunale, nota per la sua efficacia nella perdita di peso e nella risoluzione del Diabete Mellito di Tipo II, specialmente per i pazienti vegetariani. Addestrato in Italia per la Chirurgia GI Robotica, utilizza tecniche avanzate per precisione e recupero.<\/p>
Pratica Chirurgia per la Perdita di Peso e Metabolica con Tecniche Minimamente Invasive dal 2009, solo l'1% dei suoi pazienti sperimenta una morbilità significativa, allineandosi con gli standard globali. Oltre il 90% dei pazienti diabetici mantiene uno stile di vita sano senza insulina o farmaci orali.<\/p>
Il medico gestisce casi bariatrici complessi, inclusi Sleeve Gastrectomy, Gastric Bypass e Chirurgia Bariatrica di Revisione. È esperto in chirurgia avanzata minimamente invasiva e robotica del tratto gastrointestinale superiore e biliopancreatica, con numerose pubblicazioni e interventi internazionali.<\/p>
Il dipartimento di chirurgia bariatrica è certificato come centro di eccellenza dalla International Excellence Foundation.<\/p>
Undergraduate Faculty of Medicine Trakya University 1995-2001
Medical Residency Internal Medicine Uludağ University 2001-2006
Subspecialty Gastroenterology Medeniyet University, Göztepe Training and Research Hospital / Gastroenterology Clinic 2007-2011
Internal Diseases
Assistant doctor Uludağ University Faculty of Medicine
Internal Diseases USA 2001-2006
Internal Diseases Specialist Şanlı Urfa Mehmet Akif İnan
Training and Research Hospital 2007
(Jul-Dec)
Gastroenterology Minor
Assistant Istanbul Medeniyet Universityniversitesi
Göztepe Training and Research Hospital
Gastroenterology Clinic 2007-2011
Gastroenterology Specialist Sivas Numune Hospital 2011-2013
Gastroenterology
Chief Resident Health Sciences University
Ümraniye Training and Research Hospital 2013-2017
Assoc. Dr.
Chief Assistant of Gastroenterology Clinic University of Health Sciences
Ümraniye Training and Research Hospital
2017-2021
Assoc. Dr.
Gastroenterology Clinic Administrative Responsible University of Health Sciences
Ümraniye Training and Research Hospital
2021-2024
Turkish Society of Gastroenterology
Turkish Association of Liver Research
Gastrointestinal Endoscopy Society
Third Prize for Oral Presentation, 32nd National Gastroenterology Week, Turkish Gastroenterology Association, November 25-29, 2015. Turkish J. Gastroenterol 2015;26(suppl 1): Oral Presentation 03, S:11
Oral Presentation Third Prize. XVth Eurasian Congress of Gastroenterology and Surgery, 27 apr-01 May 2016, Antalya P:89
Dr. Ayman is a Medical Doctor and Surgeon specializing in General and Bariatric Surgery, with extensive training and experience in minimally invasive surgery and obesity management.
Doctor earned his Master's Degree in Medicine and Surgery from the University of Brescia in 2005. He then completed his specialization in General Surgery at the same university in 2016, with a thesis titled "Fast track in minimally invasive colon surgery. He has complete autonomy in the clinical management of complex patients and extensive experience in performing a variety of surgical procedures, including major surgeries. His expertise includes gastric and colorectal surgery, bariatric surgery, abdominal wall surgery, videolaparoscopic (VLC) and laparotomic (VLA) procedures, and proctology. He is particularly skilled in performing medium and major surgeries in emergency settings.
Currently, he practices at Maria Cecilia Hospital in Bologna, where he evaluates the degree of obesity and associated conditions. Based on these assessments, he determines the most suitable surgical intervention, such as sleeve gastrectomy, gastric bypass, and mini laparoscopic bypass.
He has advanced training in colorectal and abdominal wall surgery from top institutions in Italy and Belgium.
He is an active member of the Italian Society of Obesity Surgery and Metabolic Disorders (S.I.C.OB.) and the International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO), contributing to the advancement of bariatric surgery on an international level.
Dr. Ayman is distinguished by his dedication to patient care and his advanced skills in minimally invasive and bariatric surgery.
Doctor: Kilis Merkez No. 1 Health Center, 2006-2008
Assistant Doctor: Mersin University Faculty of Medicine, 2009-2013
Specialist Doctor: Bingöl Genç State Hospital, 2013-2014
Minor Assistant: Akdeniz University Faculty of Medicine, 2014-2017
Minor Specialist: Erzurum Regional Training and Research Hospital, 2017-2018
Subspecialist: Gaziosmanpaşa Training and Research Hospital, 2018-2020
Attending Specialist: Başakşehir Çam and Sakura City Hospital, 2020-2022
Associate Professor: Başakşehir Çam and Sakura City Hospital, 2023
Associate Professor: Istinye University Medicalpark Gaziosmanpaşa Hospital, 2023-2024
Turkish Pediatric Society
Turkish Society for Pediatric Gastroenterology Hepatology and Nutrition
ESPGHAN - European Society for Pediatric Gastroenterology Hepatology and Nutrition.
Il medico ha ricevuto una formazione in Oncologia Chirurgica presso il Tata Memorial Hospital di Mumbai e ha completato il MRCS al Royal College of Surgeons di Edimburgo. Iniziando la pratica nel 2000, il medico ha fondato il Curie Manavata Cancer Centre nel 2007. Con 19 anni di esperienza, il medico ha eseguito oltre 50.000 interventi chirurgici per il cancro e ha partecipato a più di 200 studi clinici. Il medico è un autore pubblicato con numerose pubblicazioni internazionali e nazionali. Specializzandosi in Oncologia Chirurgica della Mammella e Toracica, il medico è professore per DNB Superspecialty Surgical Oncology e Breast Surgery presso MUHS.<\/p>
Il dottore ha completato un MD in Medicina Interna presso il Shyam Shah Medical College e ha svolto una Residenza Senior nello stesso dipartimento. Successivamente, il dottore ha servito come Registrar in Oncologia Medica presso il Jawaharlal Nehru Cancer Hospital. Il dottore ha completato la formazione DNB in Oncologia Medica presso l'Indraprastha Apollo Hospital.<\/p>
Durante la Residenza Senior, il dottore ha tenuto lezioni alla Scuola Internazionale Invernale di Oncologia presso l'AIIMS e ha presentato ricerche sul Cancro allo Stomaco al Simposio sul Cancro Gastrointestinale della Società Americana di Oncologia Clinica. Il dottore è specializzato nella base molecolare del cancro e nelle terapie mirate.<\/p>
Il dottore ha completato un MBBS presso MIMER, Pune, e un MS presso GMC Panaji. Ulteriore formazione ha incluso una borsa di studio di due anni in Oncologia Chirurgica presso il Tata Medical Centre, Kolkata, con un focus sul Cancro Gastrointestinale. Al Tata Medical Center, il dottore ha servito come Co-investigatore Principale in diversi progetti di ricerca originali. Successivamente, il dottore ha lavorato come Professore Assistente presso l'Istituto Statale del Cancro e l'Ospedale del Cancro del Governo, Aurangabad. Con oltre 10 anni di esperienza, il dottore ha eseguito con successo più di 10.000 interventi chirurgici maggiori e ha pubblicato numerosi articoli Nazionali e Internazionali. Specializzato in Chirurgie Oncologiche Minimamente Invasive.<\/p>
Il dottore è un MDS in Chirurgia Orale e Maxillo-Facciale con 3 anni di esperienza in Oncologia Chirurgica presso l'HCG Manavata Cancer Centre di Nasik.<\/p>
Specializzato in cancro orale, con un focus sulla conservazione degli organi e la riabilitazione funzionale. Ha un forte interesse per l'igiene orale preventiva e la diagnosi precoce dei tumori orali.<\/p>
Competente in grandi interventi maxillo-facciali e di testa e collo e ha completato la formazione di fellowship in Oncologia Chirurgica della Testa e del Collo presso l'HCG Manavata Cancer Centre.<\/p>
Ricercatore attivo con numerose pubblicazioni.<\/p>
La dottoressa è un'oncologa altamente qualificata specializzata nel trattamento di vari tipi di cancro, inclusi tumori solidi, tumori pediatrici e malignità ematologiche. È esperta in trattamenti sia conservativi che chirurgici, come la procedura di Whipple.<\/p>
Ha completato il suo MBBS al Lady Hardinge Medical College e il MD in medicina interna al Maulana Azad Medical College. Ha proseguito con il DM in Oncologia Medica al Tata Memorial Hospital, dove ha anche lavorato come consulente.<\/p>
È affiliata a società oncologiche internazionali e nazionali e ha esperienza in tumori polmonari, mammari, ginecologici e genitourinari, con un particolare interesse per l'immunoterapia e la terapia metronomica.<\/p>
Il medico è uno specialista esperto in medicina nucleare presso l'HCG Manavata Cancer Centre con 12 anni nel campo. Il medico si specializza in vari esami nucleari, esami PET-CT e servizi di cardiologia nucleare, dimostrando competenza nelle terapie con radioiodio e Lu-177 RN. Nel corso della sua carriera, il medico ha gestito oltre 30.000 esami PET e trattato oltre 1.000 pazienti con cancro alla tiroide. Inoltre, il medico ha contribuito al campo attraverso articoli pubblicati in varie riviste mediche.<\/p>
Il medico si è laureato in Medicina presso l'Università di Mysore nel 1996, seguito da un Dottorato in Medicina in radioterapia presso l'Università Hindu di Banaras nel 2002. Per migliorare ulteriormente la sua esperienza, il medico ha conseguito un Diploma del Consiglio Nazionale in radioterapia nel 2004.<\/p>
Il medico è membro di diverse organizzazioni prestigiose, tra cui l'Associazione di Oncologia Radioterapica dell'India, la Società di Neuro-Oncologia, il Gruppo di Oncologia di Bangalore e l'Associazione Indiana di Oncologia Ipertermica, riflettendo un forte impegno per l'avanzamento del campo dell'oncologia.<\/p>
Il medico è un chirurgo generale e oncologico di spicco in Turchia con oltre 28 anni di esperienza. Specializzato in chirurgia colorettale, interventi endoscopici e laparoscopici, nonché in malattie della tiroide e del seno, il medico ha dato contributi significativi al campo.<\/p>
Laureato in medicina presso l'Università di Ankara, il medico ha completato una specializzazione in chirurgia endoscopica e laparoscopica e una residenza presso la Clinica di Chirurgia Generale Medica dell'Università di Ankara. Il medico ha ricoperto posizioni come assistente capo e professore aggiunto presso l'Università di Ankara, e chirurgo senior in vari ospedali.<\/p>
Il medico ha anche praticato la chirurgia colorettale presso il St. Mark's Hospital, l'Università del Minnesota e la Mayo Clinic, e ha pubblicato numerosi articoli sul cancro del colon.<\/p>
Il medico è uno specialista altamente esperto nel campo della neurochirurgia, con un focus su tecniche chirurgiche avanzate per il trattamento di disturbi complessi del cervello e della colonna vertebrale. Con oltre 15 anni di esperienza clinica, il medico ha eseguito numerosi interventi chirurgici di successo, contribuendo significativamente al campo attraverso approcci innovativi e cure centrate sul paziente.<\/p>
Laureato in una prestigiosa scuola di medicina e ha completato rigorosi programmi di residenza e borsa di studio. Il medico è certificato e ha pubblicato ampiamente su riviste peer-reviewed, condividendo intuizioni e progressi nelle procedure neurochirurgiche.<\/p>
Prof. M.D. Yusuf Serdar Sakin was born in Nevşehir in 1978. After completing his primary and secondary education in Ankara, he graduated from the Faculty of Medicine at Gülhane Military Medical Academy in 2002.
Following his graduation, he served in Gole/Ardahan for two years. He started his internal medicine training at the Department of Internal Medicine, Gülhane Faculty of Medicine.
After completing his training, he worked as an internal medicine specialist in Ankara. A year later, he began additional training in the Department of Gastroenterology at Gülhane Faculty of Medicine and completed his training in 2014.
After graduation, Yusuf Serdar Sakin continued to work in the same department. He also received advanced endoscopy and Motility training at AMC Center in the Netherlands in 2017.
After obtaining the title of Associate Professor in 2017, he became a Professor in 2023.
He currently provides medical services to patients at Koru Ankara Hospital. His areas of medical interest include:
-Endoscopic retrograde cholangiopancreatography (ERCP)
-Push enteroscopy
-Endoscopic mucosal resection
-High-resolution manometry
-pH/pH-impedance metry analysis
-Advanced endoscopic procedures (stenting, dilation, etc.)
-Gastrointestinal motility disorders
-Gastroesophageal reflux disease
-Inflammatory bowel diseases
-Advanced endoscopic procedures and pancreatitis.