1. From the Department of Oncology, King Faisal Specialist Hospital and Research Centre, Riyadh
2. Address reprint requests and correspondence to Dr. Ezzat, Head, Section of Medical Oncology, Department of Oncology, MBC 64, King Faisal Specialist Hospital and Research Centre, P.O. Box 3354, Riyadh 11211, Saudi Arabia
3. From the Department of Pathology, King Faisal Specialist Hospital and Research Centre, Riyadh
4. From the Department of Surgery, King Faisal Specialist Hospital and Research Centre, Riyadh