Chicago, IL - ASCO 2007 - Attendees travel to sessions, Saturday, June 2, 2007, at the American Society of Clinical Oncology's (ASCO) 43rd Annual Meeting held in Chicago's McCormick Place. The meeting attracts more than 25,000 oncologists, researchers, and cancer care professionals from more than 100 countries. Date: Saturday June 2, 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.