 - Participants with metstatic colorectal cancer mCRC diagnosed at any point prior to March 2014 United States US - Vector Oncology Protocol Sponsored by US Roche Pharma Medical Affairs, diagnosed between September 2006 and March 2015 Germany - Tumourregister Kolorektales Karzinom TKK Registry Study Supported by German Roche Pharma Affiliate, diagnosed between September 2009 and December 2014 Australia - Treatment of Recurrent and Advanced Colorectal Cancer TRACC Registry Supported by Roche Pharma Australia, diagnosed between 2009 and 2013 Denmark - Roche Diagnostic Sponsored Study and Aarhus University Hospital, Department of Clinical Epidemiology 