About Us

Dr. Tümen graduated from Istanbul University Cerrahpaşa Faculty of Medicine in 1988 and completed his specialty training and doctorate in general surgery at Izmir Dokuz Eylül Faculty of Medicine between 1990 and 1995. From then on he served for 18 uninterrupted years at ASO Oncology Hospital — the leading reference hospital for cancer treatment in the South Marmara region, serving a population of roughly 18 million — where he successfully performed around 8,000 cancer operations.

During the same period he worked for 7 years as a consultant surgeon at Medical Park Hospital, again performing oncological and advanced laparoscopic surgery. In this period he trained in cytoreductive surgery as an observer surgeon at the Milan Cancer Institute in Italy and was part of the surgical team that first introduced HIPEC (hyperthermic intraperitoneal chemotherapy for abdominal cancers) in Turkey. Between 2012 and 2014 he worked at Erbil Turkish Private Hospital and taught as an assistant professor at Istanbul Gelişim University. Dr. Tümen currently works as a consultant oncological and laparoscopic surgeon at centers in Turkey and abroad.

Areas of Expertise

• Surgery of the liver, bile ducts and gallbladder stones, and of pancreatic cancers, cysts and masses
• Esophageal and gastric cancer surgery
• Colon and small bowel cancer surgery
• Surgery for cancers involving the peritoneum and hyperthermic chemotherapy (HIPEC)
• Surgery and treatment of splenic cysts and masses
• Thyroid and breast cancer surgery
• Laparoscopic sleeve gastrectomy
• Laparoscopic hiatal hernia surgery