Tumor Marker Blood Test Doctors Abroad — Page 5

Dr. Murat Atay is a breast and general surgeon at Istanbul Florence Nightingale Hospital. He completed specialized training in sentinel node mapping at the MDA Cancer Center in Texas. Dr. Atay also held several surgical roles at Lille University Hospital in France. He focuses on breast and thyroid surgery as well as oncological procedures.

• Performs mastectomy, lumpectomy, and lymphadenectomy.
• Treats conditions such as breast cancer and fibrocystic breast disease.
• Practices at a JCI-accredited smart hospital that treats 300,000 patients annually.
• Uses PET-MRI and mammography for precise diagnosis and monitoring.

Dr. Hasan Atilla Ozkan is a hematologist at VM Medical Park Pendik Hospital in Istanbul. He is the President of the Turkish Therapeutic Apheresis Association. Dr. Ozkan specializes in stem cell transplantation and hematological oncology. He received the Young Researcher Award at the 6th Turkish Therapeutic Apheresis Congress.

• Expert in autologous and allogeneic bone marrow transplantation.
• Treats complex blood disorders including leukemia, lymphoma, and myeloma.
• Certified in clinical phytotherapy and flow cytometry application.
• Full member of the European Bone Marrow Transplantation (EBMT) group.

Dr. Cemil Bilir is a professor of medical oncology at VM Medical Park Pendik Hospital in Istanbul. He specializes in immunotherapy and chemotherapy for lung, breast, and prostate cancers. A former research fellow at Northeastern University in Boston, he focused on pharmaceutical biotechnology and nanomedicine. Dr. Bilir works at a JCI-accredited facility where academic physicians provide around-the-clock care.

• Member of the American Society of Clinical Oncology (ASCO) and ESMO.
• Completed a specialized clinical rotation at the Cleveland Clinic in the U.S.
• Treats complex oncological cases, including stage 4 lung cancer and sarcoma.
• Current Ph.D. student in inorganic chemistry at Sakarya University.

Dr. Zuhal Cakmak Peksen is a Family Medicine Specialist since 2017. She earned her MD from Çukurova University in 2010. She completed specialty training at Yüzüncü Yıl University between 2013 and 2017. She is currently studying for a bachelor’s degree in Health Management at Anadolu University (2024–present).

She has 15 years of clinical practice (2010–2025) across 8 institutions. Her experience includes research in Family Medicine (2013–2017) and work at several Family Health Centers. Since 2020, she has served at TOKİ Avrupa Family Health Center in Gaziosmanpaşa, Istanbul.

Dr. Nail Paksoy is an associate professor of medical oncology at Medipol Bahçelievler Hospital. He is board-certified by the European Society for Medical Oncology (ESMO). Dr. Paksoy specializes in lung, breast, and gastrointestinal cancers. He uses modern immunotherapy and targeted therapy protocols. His clinic is JCI-accredited for high safety standards.

• Served as a subinvestigator in over 8 international clinical trials for Roche and Pfizer.
• Authored over 40 research articles in journals indexed by SCI and SSCI.
• Completed dual fellowships in allergy-immunology and medical oncology.
• Treats complex sarcomas and renal cell carcinomas with systemic therapies.

Prof. Dr. Mehmet Sait Buğdacı is a highly experienced physician specializing in Internal Medicine and Gastroenterology. He completed his medical education and specialty training at Istanbul University Cerrahpaşa Faculty of Medicine and Şişli Etfal Training and Research Hospital. His clinical interests include gastrointestinal diseases, endoscopic procedures, and clinical research. He has contributed to medical education through numerous scientific publications and textbooks and currently sees patients at Central Hospital.

Areas of Interest • Pediatric gastrointestinal surgery • Anorectal malformations and motility disorders • Minimally invasive pediatric surgery • Pediatric colorectal and pelvic floor disorders

Assoc. Prof. Ayşe İrem Yasin, M.D., is a medical oncologist who specializes in solid tumors. Her clinical focus includes breast, lung, gastrointestinal, gynecologic, and urologic cancers. She also treats brain and other CNS tumors, soft tissue sarcomas, head and neck cancers, adenocarcinomas, melanoma, Merkel cell carcinoma, and cancers of unknown primary. She practices at Medipol Acıbadem District Hospital (2025–present). She previously worked at Şişli Etfal Training and Research Hospital (2023–2025).

She completed a Medical Oncology fellowship at Bezmialem Vakıf University (2019–2022). This followed an Internal Medicine residency at the same institution (2012–2016). Her international experience includes the Breast Cancer Unit at the University of Piemonte Orientale in Novara (2022). She also trained at Basel University Hospital, Cleveland Clinic, and Harvard Medical School. She holds the ESMO Board Certificate (2022).

Assoc. Prof. Atakan Topçu, M.D., is a medical oncologist at Medipol University and Medipol Acıbadem Regional Hospital. He treats solid tumors, including lung, breast, colorectal, gastric, and neuroendocrine cancers. His work also covers targeted therapies, immunotherapy, geriatric oncology, and cancer-related malnutrition, cachexia, and sarcopenia.

He has authored more than 50 peer-reviewed papers. Recent work includes a 2024 Frontiers in Medicine study on geriatric syndromes and a 2023 Future Oncology paper on sarcopenia and anxiety in lung cancer. He has also published on the CONUT score in breast cancer and on malnutrition in HER2-negative metastatic gastric cancer.

Dr. Topçu serves on the Editorial Board of BMC Cancer. He is a member of the Turkish Society of Medical Oncology, ESMO, and the Turkish Geriatrics Society. Education and training: M.D., Uludağ University; residency in Internal Medicine, Marmara University; fellowship in Medical Oncology, Bezmialem Vakıf University.

Prof. Selin Kapan has been a Professor of General Surgery since 2017. She is currently with Istanbul Aydın University, Faculty of Medicine, Department of General Surgery (2022–present). She previously worked at Bakırköy Dr. Sadi Konuk Training and Research Hospital as a Specialist and Associate Professor. She also served as Educational and Administrative Supervisor at Kanuni Sultan Süleyman Training and Research Hospital. In addition, she was Medical Coordinator and General Surgeon at Istanbul Surgery Hospital.

She has authored or co-authored more than 50 peer-reviewed papers. Her research covers hernia repair, perianal fistula, pilonidal disease, hepatic hydatid disease, laparoscopic surgery, and gastrointestinal surgery. Her work has been published in journals such as Digestive Surgery, Hernia, Techniques in Coloproctology, and the Journal of Gastrointestinal Surgery. She is a member of the Turkish Surgical Association, the National Trauma and Emergency Surgery Association, the Hernia Society, the Turkish HPB Surgery Association, the Stem Cell and Cellular Therapies Association, and the Gastroesophageal Reflux Association.

Dr. Irfan Cicin is a Professor of Medical Oncology at the Trakya University Faculty of Medicine (2015–present). He has over 20 years of medical oncology experience and has held academic roles since 2010.

Education: MD, Istanbul University – Cerrahpaşa (1991–1997). Residency in Internal Medicine, Trakya University (1997–2002). Fellowship in Medical Oncology, Trakya University (2002–2004).

Practice: Medical Oncologist, Trakya University (2005–2008). Medical Oncologist, Elazığ Training and Research Hospital (2008–2010). Associate Professor of Medical Oncology, Trakya University (2010–2015). He previously served as a physician in the Turkish Air Force at Etimesgut Military Hospital (2004–2005).

Dr. Muhammed Mustafa Atci is an Associate Professor of Medical Oncology at İstinye University, Liv Hospital Topkapı (2025–present). He previously served as Associate Professor and Education Coordinator at Prof. Dr. Cemil Taşcıoğlu City Hospital (2023–2025). He was also a Medical Oncologist there (2018–2021).

He has been a member of ASCO and the Turkish Society of Medical Oncology since 2018. He is the author or co-author of 19 peer-reviewed international papers on colon, breast, gastric, pancreatic, lung, thyroid, sarcoma, and colorectal cancers.

Notable works include a multicentre study on stage IIB colon cancer survival (Journal of Chemotherapy). He also studied the De Ritis ratio for lung metastasis in testicular cancer (Current Urology). His prognostic studies used PET/CT, MSI, lymph node ratio, and metabolic tumor volume.

Dr. Hasan Mutlu is a medical oncologist at Medical Park Antalya Hospital Complex. He specializes in immunotherapy, targeted cancer therapies, and genetic research in cancer treatment. Dr. Mutlu received his medical degree from Hacettepe University. He holds the title of Professor of Medicine. Dr. Mutlu focuses on organ tumor diagnosis and chemotherapy.

• Specializes in both medical and pediatric oncology cases.
• Treats complex conditions including neuroblastoma, Wilms tumor, and Ewing's sarcoma.
• Performs biological therapies and stays active in next-generation genetic research.
• Works at the Mediterranean region’s largest private hospital with PET-CT and LINAC technology.

Dr. Yasar Tuna is a gastroenterologist and gastrointestinal surgeon at Medical Park Antalya Hospital Complex. He specializes in the treatment of complex digestive conditions and bariatric surgery. Dr. Tuna performs procedures at a facility that houses one of Turkey's premier organ transplant centers.

• Treats chronic conditions including Crohn's disease, ulcerative colitis, and cirrhosis.
• Performs bariatric procedures such as gastric sleeve, gastric bypass, and gastric balloon.
• Member of the Turkish Society of Gastroenterology and the Endoscopy Association.
• Works at a facility that performs the most successful transplants in Turkey.

EDUCATION:

2000 - SSK Okmeydanı Training and Research Hospital, .

1996 - Istanbul University, Istanbul Faculty of Medicine

EXPERIENCE:

2019 - Istanbul Medipol University Pendik Hospital

2017 - 2019 - Private Adatıp Kurtköy Hospital

2005 - 2017 - Private Avicenna Umut Hospital

2003 - 2005 - SSK Yalova Regional Hospital

2002 - 2003 - Kayseri Military Hospital

Dr. Ugur Yayla is an ophthalmologist at Medipol University Pendik Hospital in Istanbul. He specializes in vitreo-retinal surgery and treats complex conditions like retinopathy of prematurity. Dr. Yayla completed a specialized fellowship in medical retina at Gazi University. He works at a center that serves over 350,000 patients annually.

• Performs retinal detachment surgery and retinopathy of prematurity (ROP) procedures.
• Specializes in cataract surgery with IOL replacement and multifocal lens implants.
• Provides laser vision correction including LASIK, LASEK, and SmartSight techniques.
• Treats glaucoma using laser trabeculoplasty and surgical intervention.

Dr. Mustafa Serkan Alemdar is a clinical oncologist at Medical Park Antalya Hospital Complex. He specializes in treating complex solid tumors and blood cancers. Dr. Alemdar completed his medical degree and oncology fellowship at Akdeniz University. He is an active member of the Turkish Society of Medical Oncology.

• Treats a wide range of cancers including breast, lung, and prostate.
• Expert in hematology-oncology for conditions like leukemia, myeloma, and lymphoma.
• Performs systemic therapies such as chemotherapy, immunotherapy, and targeted biological therapy.
• Works at a facility that houses specialized oncology-bone marrow units and LINAC technology.

Dr. Benal Buyukgebiz is a pediatrician and gastroenterology specialist at Istanbul Florence Nightingale Hospital. She served as the Chair of the Department of Pediatrics at Yeditepe University. Dr. Buyukgebiz treats complex digestive conditions in children, including Crohn's disease and ulcerative colitis. She works at a JCI-accredited facility that treats 300,000 patients every year.

• Former President of the Phenylketonuria Children Screening and Protection Association, İzmir Branch.
• Maintains membership in the European Metabolic Group and the Liver Research Society.
• Specializes in pediatric nutrition and the management of chronic gastritis and cirrhosis.
• Performs diagnostic procedures including gastroscopy with biopsy and colonoscopy.

Dr. Shencan Acar is a gastroenterologist at Istanbul Florence Nightingale Hospital. She focuses on hepatology and liver disease management. Dr. Acar specializes in inflammatory bowel diseases like Crohn’s and ulcerative colitis. She previously served as the Head of Department at Giresun University Faculty of Medicine.

• Authored over 20 international peer-reviewed articles.
• Expert in managing complex post-transplant gastrointestinal complications.
• Treats rare conditions like aortoesophageal fistulas and massive hemorrhagic ascites.
• Performs endoscopic interventions for acute gastrointestinal bleeding.