Best Tumor Marker Blood Test Doctors Abroad

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.

50,000+ cancer surgeries performed – Dr. Raj Nagarkar is the founder and chief of surgical oncology at HCG Manavata Cancer Centre.

• Specializes in complex breast, thoracic, and colorectal cancer cases
• Uses tumor marker blood test results to guide surgical treatment plans
• Served as a surgical oncology resident at Tata Memorial Hospital
• Professor for DNB Superspecialty Surgical Oncology – trains future cancer surgeons
• Member of the Royal College of Surgeons of Edinburgh

Dr. Abdulkerim Yilmaz is a gastroenterologist at Medicana Sivas Hospital in Turkey. He treats digestive conditions including cirrhosis, Crohn's disease, and pancreatitis. Dr. Yilmaz performs endoscopic procedures to remove polyps from the stomach and duodenum.

He works at Medicana Sivas, a facility that treats over 110,000 patients annually. The hospital has 219 beds and a department for gastrointestinal care. Dr. Yilmaz manages chronic inflammatory bowel diseases like ulcerative colitis and Barrett's esophagus. He also treats gastric issues such as ulcers, gastritis, and gallstones.

Prof. Michael Truss is a FOCUS-recognized urologist who leads the German Cancer Society-accredited department at Dortmund Clinic.

• Directs the urology department and serves as an expert in oncourology – the study of urinary cancers
• Performs tumor marker blood tests to screen for and monitor prostate cancer
• Received clinical training at Johns Hopkins Hospital and an internship at Harvard University
• Published research in major journals like Andrology and the International British Journal of Urology
• Winner of the Jack Lapides Prize for his contributions to urodynamic research

Dr. Hamza Ugur Bozbey is a clinical oncologist at Uniqacare Clinic in Istanbul. He treats malignancies including glioblastoma, sarcoma, and stage 4 lung cancer. He manages solid tumors and hematological cancers such as leukemia and lymphoma, as well as rare conditions like chordoma and neuroendocrine tumors.

• Treats gynecologic, orthopedic, and neurological cancers.
• Uses chemotherapy and targeted therapy for stage 4 metastatic disease.
• Works at Uniqacare Clinic, which serves over 430,000 patients annually.
• Member of the Turkish Medical Association.

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.

Dr. Siar Dursun is a pediatric neurologist at Medipol University Pendik Hospital in Istanbul. He specializes in treating complex neurological conditions in children, including epilepsy and cerebral palsy. Dr. Dursun completed his medical training at Adnan Menderes University and Izmir Research Hospital. He works at a university-affiliated center that serves 350,000 patients annually.

• Treats neurodegenerative diseases, West syndrome, and spinal muscular atrophy.
• Performs pediatric check-ups and diagnostic video-EEG monitoring for epilepsy.
• Provides medication management for autism and Parkinson’s disease.
• Practices at a hospital with 21 dedicated newborn intensive care units.

Dr. Mesut Okur is a professor and chief physician at Medipol University Pendik Hospital in Istanbul. He specializes in pediatric health and diseases, with a focus on internal medical sciences. Dr. Okur has published over 25 international peer-reviewed articles. He treats children for conditions ranging from congenital heart defects to thyroid disorders.

• Published research on Down syndrome, pediatric brucellosis, and neonatal health.
• Supervises specialized medical theses on allergic rhinitis and pediatric diabetes.
• Practices at a hospital holding a Healthcare Quality Standards Certificate of 95.4%.
• Performed clinical research on pediatric voiding dysfunction and enuresis.