January 21, 2016 Carolyn Compton. General Session 7: Controversies in Screening and Surveillance in Colorectal Cancer. 2016 Gastrointestinal Cancers Symposium. San Francisco, CA (Jan 21, 2016 – Jan 31, 2016) Home ยป Carolyn Compton. General Session 7: Controversies in Screening and Surveillance in Colorectal Cancer. 2016 Gastrointestinal Cancers Symposium. San Francisco, CA (Jan 21, 2016 – Jan 31, 2016)