Cagatay Saim Tezel

Prof. Cagatay Saim Tezel is a surgeon in thoracic surgery at Memorial Şişli Hospital. He is a member of the European Society of Thoracic Surgeons and the European Respiratory Society. Prof. Tezel completed clinical observerships at the Royal Brompton Hospital and Leicester University in the UK.

Specialization & Approach

Prof. Tezel treats a variety of chest diseases and thoracic conditions. He performs lung transplant procedures and was a member of the Süreyyapaşa Thoracic Surgery Transplant Team. He also performs surgical oncology to treat lung cancer. His approach combines clinical leadership with research into thoracic outcomes.

Work Experience

• 2025 – Present – Memorial Şişli Hospital – Professor of Thoracic Surgery, Istanbul
• 2021 – 2025 – Haliç University Faculty of Medicine – Professor of Thoracic Surgery
• 2021 – 2025 – Liv Hospital Ulus – Professor of Thoracic Surgery
• 2020 – 2021 – Educational Supervisor and Associate Professor of Thoracic Surgery
• 2013 – 2020 – SB Istanbul Süreyyapaşa Training and Research Hospital – Associate Professor
• 2012 – 2013 – SB Istanbul Süreyyapaşa Training and Research Hospital – Associate Professor
• 2007 – 2010 – SB Istanbul Süreyyapaşa Training and Research Hospital – Thoracic Surgery Specialist
• 2006 – 2007 – SB Istanbul Haydarpaşa Numune Training and Research Hospital – Resident

Education & Training

• 1993 – 1999 – Ankara University Faculty of Medicine – MD Degree
• 2000 – 2005 – SB Istanbul Heybeliada Training and Research Hospital – Thoracic Surgery Specialty
• Royal Brompton Hospital, London – 6–month clinical observer in thoracic surgery
• Leicester University, UK – Observership at thoracic surgery clinics

Research & Recognition

Prof. Tezel received third place in the Istanbul Medical Chamber Thesis Competition. He served as a thesis advisor for research on pulmonary ligament disruption. This study focused on functional and radiological outcomes in upper lobectomy patients. In 2001, he joined the editorial board of the Heybeliada Medical Bulletin.

He has contributed to international medical discourse through several programs:

• Society of Thoracic Surgeons (STS) 41st Annual Meeting, Florida, USA
• Ankara University Esophageal Surgery Program
• Yeditepe University Faculty of Medicine – Internship Lecturer (2013–2020)

Professional Memberships

• Turkish Thoracic Surgery Society
• European Society of Thoracic Surgeons
• Turkish Thoracic Society
• Respiratory Research Association of Türkiye
• National Trauma and Emergency Surgery Association
• Lung Cancer Association
• European Respiratory Society