An Observational Study of Avastin and Conventional Chemotherapy in Patients >/= 70 Years of Age With Previously Untreated Metastatic Colorectal Cancer (AVAPLUS)

This observational study will evaluate the use of Avastin (bevacizumab) and conventional chemotherapy in patients >/= 70 years of age with previously untreated metastatic colorectal cancer. Data will be collected from each patient from initiation of treatment until disease progression occurs (minimum follow-up 12 months).