Tumor Marker Blood Test Doctors Abroad — Page 9

Dr. Ayşe İrem Yasin is a medical oncologist at Medipol Acıbadem District Hospital in Istanbul. She holds a prestigious ESMO Board Certificate. Dr. Yasin specializes in solid tumors, including breast, lung, and gastrointestinal cancers. She treats complex cases such as Merkel cell carcinoma and cancers of unknown primary.

• Trained at Harvard Medical School, Cleveland Clinic, and Basel University Hospital.
• Completed a clinical observership at the Breast Cancer Unit in Novara, Italy.
• Treats brain and CNS malignancies, soft tissue sarcomas, and urologic cancers.
• Works at a JCI-accredited facility equipped with the da Vinci robotic system.

Dr. Didem Tastekin is a medical oncologist at Biruni University Hospital in Istanbul. She specializes in breast and lung cancer treatment, including stage 4 cases. Dr. Tastekin received the TUBITAK Incentive Award for her work in cancer research. She is an active member of both ESMO and ASCO.

• Awarded Best Researcher of the Year at Istanbul University Oncology Institute.
• Treats complex cases at a TEMOS-accredited university hospital.
• Coordinates oncological check-ups and screenings for both men and women.
• Expert in diagnostics including PET-MRI, tumor markers, and organ biopsies.

Prof. Dr. Suna Emir graduated from Hacettepe University Faculty of Medicine in 1989. She completed her pediatrics residency at Hacettepe University from 1990 to 1995. In 2001, she finished her pediatric oncology subspecialty at the Hacettepe University Oncology Institute. She became an Associate Professor in 2004. From 2004 to 2009, she worked at Ankara Dışkapı Children's Health and Diseases Training and Research Hospital and founded the Pediatric Oncology Clinic there. In 2009, she served as Deputy Chief of Pediatric Oncology. From 2009 to 2016, she was a pediatric hematology–oncology training officer at the Ankara Children's Health and Diseases Hematology–Oncology Training and Research Hospital. Since 2019, she has been a Professor and founding faculty member in Child Health and Diseases at Atilim University.

She is an expert in general pediatrics and pediatric hematology–oncology. She is active in residency and subspecialty training. Her clinical interests include childhood diseases from birth to 18 years, lymphoma, solid tumors, autologous bone marrow transplantation, anemia, bleeding disorders, hereditary blood diseases, hemangiomas and other benign tumors, and enlarged lymph nodes.

Prof. Dr. Abdullah Sakin is a professor of medical oncology. He treats solid tumors, including lung, breast, gastrointestinal, genitourinary, gynecologic, head and neck cancers, and melanoma.

He delivers personalized, evidence-based care. His treatments include chemotherapy, targeted therapy, immunotherapy, hormone therapy, and precision oncology. He has authored more than 200 scientific publications and takes part in international clinical research. This work advances patient-centered cancer care.

Prof. Dr. İbrahim Doğan is a gastroenterologist. He earned his MD from Ankara University Faculty of Medicine in 1991. He became an Internal Medicine specialist at Gazi University in 1996. He completed gastroenterology subspecialty training at İnönü University in 2001.

His academic career was at Gazi University. He served as Lecturer (2002), Assistant Professor (2003), Associate Professor (2007), and Professor (2012). He worked as a researcher at the University of California San Diego from 2004 to 2006. He has practiced at Koru Hospital since January 2023.

Clinical focus includes gastroesophageal reflux, irritable bowel syndrome, constipation, gastroparesis, achalasia, bloating, gas and belching, fecal incontinence, ulcerative colitis, and Crohn’s disease. He performs ERCP, stent placement, balloon and bougie dilation, polypectomy, argon plasma coagulation, double-balloon enteroscopy, and bleeding control.

Dr. Kadri Yamac is an internist and hematologist. He earned his medical degree from Ankara University Faculty of Medicine (1976–1982). He completed Internal Medicine training at Gazi University Faculty of Medicine (1984–1989). He then completed a Hematology subspecialty at Gazi University Faculty of Medicine (1990–1993). He became an Associate Professor at Gazi University Faculty of Medicine in 1995. He was promoted to Professor in 2002.

Medical interests: anemias, coagulation disorders, hemochromatosis, chronic lymphocytic leukemia, lymph node diseases, non-Hodgkin lymphoma, Hodgkin lymphoma.

Assoc. Prof. Orhan Ünal Zorba, MD, is a urologist focused on andrology and endourology. He has about 25 years of experience. He currently sees patients at Private TUSA Hospital. He started there on 8 June 2026.

His academic work includes 29 international and 13 national publications and 7 book chapters. He has given at least 9 presentations at international congresses. His studies have been presented at EAU, ESSM, ICS, and EULIS meetings. He served as Assistant and Associate Professor of Urology from 2009 to 2016. He is a member of the Istanbul Medical Chamber, the Turkish Association of Urology, the Turkish Society of Andrology, and the Eastern Black Sea Association of Urologists.

Key areas include male infertility (micro‑TESE; outcomes in 191 patients with non‑obstructive azoospermia), microsurgical varicocele repair, prostate surgery (HoLEP, TURP), endoscopic stone surgery (URS, PCNL), and uro‑oncology. He speaks English.

Prof. Dr. Musa Aydınlı is an internal medicine specialist and gastroenterologist. He completed his MD at Hacettepe University in 1997. He finished internal medicine training in 2003 and gastroenterology training in 2007 at the same institution. He worked at Kayseri Training and Research Hospital from 2007 to 2009. He served in the Gastroenterology Department at Gaziantep University from 2009 to 2014. He became an associate professor in 2012 and a professor in 2020. He joined Gülhane Training and Research Hospital in 2022. He now practices at Private Koru Ankara Hospital.

Clinical focus: GERD; dyspepsia, gastritis, and Helicobacter pylori; peptic ulcer disease; celiac disease; IBS and IBD (ulcerative colitis, Crohn’s disease); colon polyps; colorectal and upper GI cancers; liver disease (fatty liver, chronic hepatitis, cirrhosis, portal hypertension); hepatobiliary and pancreatic disorders and cancers. Procedures: EGD, rectosigmoidoscopy, and colonoscopy; biopsy, polypectomy, and endoscopic mucosal resection; hemostasis and APC; dilation and stent placement; PEG; ERCP; EUS-guided biopsy.

Dr. Ali Hakan Kaya is a hematologist at Biruni University Hospital in Istanbul. He won first prize from the Blood and Bone Marrow Transplantation Association for his research. Dr. Kaya specializes in stem cell transplants and treating complex blood cancers. He works at a TEMOS-accredited university hospital equipped with a dedicated hematology-oncology department.

• Performs allogeneic bone marrow transplants from both related and unrelated donors.
• Treats leukemia, myeloma, and various types of lymphoma using CAR T-cell therapy.
• Is a member of the Turkish Apheresis Society and the Hematologic Oncology Society.
• Received multiple awards for his scientific papers on hematologic immunology and oncology.

With an extensive career spanning over four decades, the doctor is a distinguished specialist in pediatrics and neonatal neurology. Following residency at Gazi University, the doctor served as an assistant professor and played a pivotal role in establishing the Pediatric Neurology Department. International experience includes clinical work at the Royal Free Hospital and Great Ormond Street Hospital in London.

The doctor is recognized for pioneering hypothermia treatment in Turkey and advancing neonatal neurocritical care. Further contributions include establishing high-risk infant monitoring clinics and founding the Turkish Childhood MS Working Group. The doctor continues to provide significant academic and clinical expertise in neurodevelopmental fields.

Prof. Dr. Gül Alço is a radiation oncologist with about 27 years of experience. She treats breast, lung, prostate, gastrointestinal, gynecologic, central nervous system, head and neck, soft tissue, and bone cancers with radiotherapy.

Her expertise includes adaptive radiotherapy and radiosurgery. She uses advanced radiation techniques to provide personalized, evidence-based care in a multidisciplinary, patient-centered setting.

Dr. Metin Demirkaya is a Professor of Pediatric Oncology at Medicana Bursa Hospital. He specializes in treating childhood cancers, including neuroblastoma, Ewing's sarcoma, and leukemia. Dr. Demirkaya previously practiced at the GATA Pediatric Hematology-Oncology and Bone Marrow Transplantation Centre. He holds a subspecialty in pediatric oncology from Bursa Uludag University.

• Performs bone marrow biopsies and complex chemotherapy for pediatric sarcomas.
• Expertise includes the installation of subcutaneous PORT-A-CATH systems for treatment delivery.
• Treats childhood solid tumors such as Wilms tumor and rhabdomyosarcoma.
• Works at Medicana Bursa, a regional reference center for specialized cancer care.

Dr. Raj Nagarkar has performed over 50,000 cancer surgeries at HCG Manavata Cancer Centre. He specializes in breast and thoracic surgical oncology. Dr. Nagarkar trained at the prestigious Tata Memorial Hospital in Mumbai. He is a Member of the Royal College of Surgeons in Edinburgh.

• Participated as a lead investigator in more than 200 clinical trials.
• Serves as a professor for DNB Superspecialty Surgical Oncology.
• Expert in complex procedures including mastectomy and thoracic resections.
• Founder of Curie Manavata Cancer Centre, a major regional treatment hub.

Dr. Nihat Okcu is a gastroenterologist and gastrointestinal surgeon at Medipol University Pendik Hospital. He specializes in the treatment of complex digestive conditions and liver diseases. Dr. Okcu has published over 20 academic papers on gastric cancer and endoscopic diagnosis. He serves at a hospital with a 95.4% healthcare quality score.

• Performs laparoscopic anti-reflux surgery and small intestine resections.
• Expert in gastric polyps removal and duodenal polyp excision.
• Treats chronic conditions like cirrhosis, Crohn’s disease, and ulcerative colitis.
• Provides diagnostic gastroscopy with biopsy and ultrasound-guided procedures.

Dr. Mehmet Ali Gok is an Associate Professor of General Surgery at Medipol University Pendik Hospital. He specializes in laparoscopic hernia repair and metabolic surgery. Dr. Gok has authored over 20 national and international scientific articles on surgical outcomes. He practices at a hospital with 95.4 out of 96.4 healthcare quality points.

• Certified in robotic colorectal surgery and laparoscopic hernia techniques on cadavers.
• Received specialized training from the European Hernia Society in Dubai.
• Served as a former Chief Physician at Silopi State Hospital.
• Editor of several medical books on oncological, hernia, and minimal invasive surgery.