[1] King Fahad Med City, Dept Pediat Oncol, Comprehens Canc Ctr, Riyadh, Saudi Arabia
[2] King Fahad Med City, Dept Radiat Oncol, Comprehens Canc Ctr, Riyadh, Saudi Arabia
[3] King Fahad Med City, Saudi Human Genome Project, Genom Res Dept, Riyadh, Saudi Arabia
[4] King Abdulaziz City Sci & Technol, Riyadh, Saudi Arabia
[5] Harvard Med Sch, Brigham & Womens Hosp, Dept Pathol, Boston, MA 02115 USA