Chicago, IL - ASCO 2007 - Attendees view the American Society of Clinical Oncology's (ASCO) enduring materials, Saturday, June 2, 2007, during ASCO's 43rd Annual Meeting. 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.