Lee Ji Hyun, MD, is a breast and thyroid surgeon. Dr. Lee is Head of Breast and Thyroid Surgery at Naeun Hospital. Clinical focus includes benign breast disease, breast cancer, and tumor surgery. Additional areas include benign thyroid disease, thyroid cancer, and parathyroid disorders. Skills include Mammotome procedures, axillary node management, and breast and thyroid ultrasound.

Education and training: Yonsei University College of Medicine. Internship and general surgery residency at Yonsei University Severance Hospital. Short-term clinical training at the Affiliated Hospital of the Cancer Research Institute in Japan.

Key roles: Chief of General Surgery at Incheon Christian Hospital and General Surgery Specialist at Cheil Hospital. Director of the Breast Center and Chief of the Department of Surgery at Samsung Cheil Hospital. Chief of General Surgery and Deputy Director of Clinical Services at Cheil Hospital. Outpatient Professor of Surgery at CHA Gangnam Medical Center, CHA University. Chief of General Surgery at Daejeong Hospital.

Education & Expertise

• 1998 to 2004 – Istanbul University, Istanbul Faculty of Medicine
• 2005 to 2009 – Düzce University, Internal Medicine Specialization
• 2009 to 2010 – Beytüşşebap State Hospital, Compulsory Internal Medicine Service
• 2010 to 2013 – Bülent Ecevit University, Medical Oncology Specialization
• 2013 to 2015 – Recep Tayyip Erdoğan University, Medical Oncology Compulsory Service
• 2015 to Present – Associate Professor, Recep Tayyip Erdoğan University
• 2015 to 2021 – Lecturer, Medical Oncology, Sakarya University Faculty of Medicine
• 2020 to Present – Professor, Sakarya University Faculty of Medicine
• 2020 to Present – Ph.D. Student, Inorganic Chemistry, Sakarya University

Experience

• 2008 – Cleveland Clinic, Rheumatology & Gastroenterology Rotation
• 2016 to 2017 – Northeastern University, The Center for Pharmaceutical Biotechnology and Nanomedicine, Boston, U.S.

Professional Memberships

• TTOD (Turkish Society of Medical Oncology)
• ASCO (American Society of Clinical Oncology)
• ESMO (European Society for Medical Oncology)

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. Ercan Ozden is a specialist in internal medicine and medical oncology. He earned his medical degree and completed his residency at Istanbul University, Cerrahpaşa Faculty of Medicine. He later received a subspecialty in medical oncology at Kocaeli University Faculty of Medicine from 2016 to 2020.

Dr. Ozden has worked in medical oncology at Şırnak State Hospital. He has also served as an internal medicine specialist at Bağcılar Private Safa Hospital and Küçükçekmece Batı Bahat Hospital. He has extensive clinical experience in both internal medicine and oncology.

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.

Education and Specialization

• 2006: Kocaeli University Faculty of Medicine
• 2014: Akdeniz University Faculty of Medicine, Internal Medicine
• 2018: Akdeniz University Faculty of Medicine, Medical Oncology

Experience

• 2006 - 2008: Konya Derebucak District Hospital
• 2009 - 2015: Akdeniz University Hospital
• 2015: Antalya Kaş State Hospital
• 2015 - 2016: İnönü University Faculty of Medicine
• 2016 - 2021: Akdeniz University Hospital
• 2021 - 2023: Antalya Training and Research Hospital

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).

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.