Dr. James Brooks is part of a team of researchers who received funding from the National Institutes of Health to use natural language processing to mine electronic medical records to identify patients with low risk prostate cancer who are managed by Active Surveillance. In Active Surveillance, men with small, low risk cancers are followed with PSA tests, physical examinations and biopsies with the intention that they switch to either surgery or radiation therapy if their cancer becomes more aggressive. Dr. Brooks is part of a national study of Active Surveillance in which they have found that approximately 2/3 of patients have cancers that do not progress and do not need treatment after 5 years of monitoring. Identifying all patients on Active Surveillance at Stanford and elsewhere will allow Dr. Brooks and colleagues to look at the safety of Active Surveillance, understand variations in care patterns (. how often patients get PSA tests and biopsies) and test whether other tests such as prostate MRI scans are helpful in managing patients.