1. From the Departments of Surgery, Medical Oncology and Radiation Oncology (Drs. Al-Mashat, Sibiany, Radwi and Bahadur), College of Medicine and Allied Sciences, King Abdulaziz University, and the Departments of Medical Oncology, Radiation Oncology and Pathology (Drs. Al-Radi, Meir and Ahmed), King Abdulaziz Hospital and Oncology Centre, Jeddah, Saudi Arabia