Figure 1:

Simplified schematic of identification of analyzable patients as of January 2014, followed by algorithm extraction of tumor type, date of diagnosis, and date of death or last contact using a variety of structured and unstructured data sources. Binary digits icon represents metadata including date stamps of scanned documents; text icon represents searchable electronic text data; PDF icon represents scanned images; Social Security icon represents the Social Security Death Index. CPT: Current Procedural Terminology, 4th edition code (copyright 2013 American Medical Association); ICD-9-CM: International Classification of Diseases, 9th Edition, Clinical Modification; PDF: Portable Document Format.