Chicago, IL - ASCO 2013 Annual Meeting: - CCF Top Donors at Opening Session of the American Society for Clinical Oncology (ASCO) Annual Meeting here today, Saturday June 1, 2013. Over 30,000 physicians, researchers and healthcare professionals from over 100 countries are attending the meeting which is being held at the McCormick Convention center and features the latest cancer research in the areas of basic and clinical science. Photo by © ASCO/Silas Crews 2013 Technical Questions: todd@toddbuchanan.com; ASCO Contact: photos@asco.org