Affiliation: | 1. Department of General Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia;2. Department of Pathology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia;3. Department of Radiation Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia;4. Department of Medical Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia |