Prof. Ben Boursi is a physician in the Gastrointestinal Cancer Department at Sheba Medical Center. He specializes in internal medicine, medical oncology, and cancer epidemiology. He is board certified in internal medicine and medical oncology. He earned a B.Med.Sc (summa cum laude) and an MD (magna cum laude) from Tel Aviv University.

He completed clinical and research fellowships in GI oncology and cancer epidemiology at the University of Pennsylvania. He also completed electives at MD Anderson and Mayo Clinic. He founded the ECOG-ACRIN Microbiome Working Group. His microbiome-oncology research has been published in leading journals, including Science, and highlighted by ASCO.

He developed predictive models for early diagnosis of colorectal and pancreatic cancers. These models are now in clinical evaluation. He holds an academic appointment at Tel Aviv University. He is also an Associate Scholar at the University of Pennsylvania.

Professor Raanan Berger, MD PhD, is a medical oncologist and radiotherapist. He is Director of the Cancer Center at Sheba Medical Center and heads its clinical research unit. He was listed in Forbes Israel’s “Best Doctors” (2025). He leads the genitourinary oncology program with a focus on prostate cancer. His care includes systemic therapy and radiotherapy in a multidisciplinary, patient-centered model.

He is board-certified in oncology. He earned his MD and PhD at Tel Aviv University and completed his clinical training at Sheba. He then completed a postdoctoral fellowship at Dana-Farber/Harvard, focusing on prostate cancer with Dr. Philip Kantoff and molecular oncology in Dr. William C. Hahn’s lab. He is a member of ESMO and ASCO. He has co-authored more than 20 peer-reviewed papers, including studies on outcomes in high- versus very high-risk prostate cancer and on BRCA1/2 in large cohorts.

Dr. Yaacov Lawrence, MA, MBBS, MRCP, is Chair of Radiation Oncology at Sheba Medical Center. He has nearly 30 years of experience in precision radiation oncology and neuro-oncology.

He is an expert in advanced radiation therapy and radiosurgery. He performs stereotactic radiosurgery for brain tumors. He leads Sheba’s GI Cancer Program in gastrointestinal oncology. He also provides precision care for lung and prostate cancers. He pioneered celiac plexus radiosurgery for severe pain from pancreatic cancer.

Training and credentials: MA and MBBS (Cambridge and UCLH); MRCP (RCP); Radiation Oncology fellowship (Thomas Jefferson University). Honors include the ASCO Young Investigator Award and Fellow of ASTRO (FASTRO). He has authored over 280 publications. He is Director of the Center for Translational Radiation Oncology and an Associate Professor at Tel Aviv University.

Dr. Mohamed Mahmoud Abdelhakim is Head of Radiation Oncology at Shefa al Orman Hospital, Luxor. He is Professor of Radiation Oncology at the National Cancer Institute, Cairo University. He previously served as Associate Professor (2015–2020), Lecturer (2010–2015), Assistant Lecturer (2003–2009), and Resident (2000–2003). He also worked as a Specialist at Gharbia Cancer Society.

He treats inpatients and outpatients with breast, soft tissue sarcoma, lymphoma, gynecologic, gastrointestinal, genitourinary, and CNS tumors. His skills include image-guided brachytherapy, IMRT, VMAT, SRS, and SBRT. He performs conventional and CT-based planning and 3D-CRT. He works with cobalt and linear accelerators and electron beam therapy. He provides HDR and LDR intracavitary and interstitial brachytherapy. He also performs stereotactic radiotherapy, total body irradiation, and total skin irradiation.

Member: Egyptian Cancer Society, ESTRO, ESMO.

Professor Duygu Derin has authored over 30 scientific papers on cancer treatment and is a leading oncologist at LIV Hospital Ulus.

• Extensive experience treating gastrointestinal cancers, including sigmoid colon cancer
• Author of more than 30 national and international oncology papers
• Member of the European Society for Medical Oncology (ESMO)
• Associate Professor with advanced academic credentials
• Her expertise is well-recognized among Turkish and European oncologists

Specializes in surgical treatment of gastrointestinal diseases, including oncological conditions like sigmoid adenocarcinoma at Dievo Surgery Center.

• Performs laparoscopic operations for various abdominal conditions
• Expert in treating acute abdominal emergencies
• Skilled in bariatric surgery and metabolic dysfunction treatment
• Experienced in managing colorectal conditions and hemorrhoids

Dr. Tarkan specializes in complex surgeries for stomach cancer, bringing focused expertise to challenging cases.

• Member of Turkish Bariatric Surgery Association
• Affiliated with International Federation for the Surgery of Obesity
• Graduated from Dicle University Faculty of Medicine

Dr. Sahibov specializes in radiation oncology, trained at Marmara University – one of Turkey’s leading medical schools.

• Completed specialization training in radiation oncology at Marmara University
• Focuses on precise radiation therapy for gastrointestinal cancers
• Works at Emsey Hospital – a center with advanced radiation technology

Dr. Johann Ockenga specializes in surgical oncology with of experience, focusing on gastrointestinal cancers like Sigmoid adenocarcinoma at Bremen-Mitte Clinic.

• Secretary of the German Society of Nutritional Medicine
• Developed guidelines for nutritional medicine in cancer care
• Published extensively in the World Journal of Gastroenterology

Professor Huseyin Bektas specializes in oncological surgery at Bremen-Mitte Clinic, with a focus on hepatobiliary and pancreatic procedures.

• Author of numerous scientific publications in oncology
• Member of the Association of Hepatobiliary and Pancreatic Surgery
• Teacher at the Hanover School of Medicine
• Chief Physician of the Department of General, Visceral and Oncological Surgery

Specialist in gastrointestinal tract treatment at Bumrungrad International Hospital, focusing on comprehensive surgical care.

• Experienced in treating various gastrointestinal conditions
• Skilled in surgical oncology for digestive tract cancers
• Works at a leading international hospital with advanced facilities

Dr. Sarat Chandra P is an experienced oncologist at Manipal Hospitals, specializing in sigmoid adenocarcinoma.

• Focuses on personalized treatment plans for each patient
• Works at a leading hospital with advanced oncology facilities
• Committed to evidence-based cancer care

With over two decades specializing in radiotherapy, Dr. Sridhar P.S. brings deep expertise to sigmoid adenocarcinoma treatment at HCG Manavata Cancer Centre.

• MD in Radiotherapy from Banaras Hindu University
• Diplomate of National Board in Radiotherapy
• Member of Association of Radiation Oncology of India
• Part of Society for Neuro-Oncology and Bangalore Oncology Group

Professor Jorg Groticke leads the Oncology and Hematology Center at Bremen Mitte Hospital, specializing in gastrointestinal tumors.

• Chief Physician with over of experience in oncology
• Specialized in hematological malignancies and gastrointestinal tumors
• Member of German Society of Hematology and Medical Oncology
• Conducts lectures on innovative cancer therapy at Bremen Oncology Society

Dr. Ajit Pai specializes in surgical treatment of gastrointestinal cancers, including sigmoid adenocarcinoma, at Apollo Hospital Indraprastha.

• Expert in colon and rectum cancer surgeries
• Also treats gastric and pancreatic cancers
• Experienced in oncogynecology cases