Chicago, IL - ASCO 2007 - Attendees review materials while at the American Society of Clinical Oncology's (ASCO) 43rd Annual Meeting. The meeting attracts more than 25,000 oncologists, researchers, and cancer care professionals from more than 100 countries. Date: Monday, June 4, 2007. Credit: Photo Courtesy © ASCO/Scott Morgan 2007. ASCO Contact: Tiffany Reynolds/Communications Dept.; 703-519-1423. Technical Questions: firstname.lastname@example.org; 612-226-5154.