Accepted for Publication: February 4, 2013.
Published Online: May 20, 2013. doi:10.1001/jamainternmed.2013.1020
Author Contributions: Drs Goldin, Sheets, and Meyer contributed equally to the study. Study concept and design: Goldin, Meyer, and Chen. Acquisition of data: Goldin, Carpenter, and Chen. Analysis and interpretation of data: All authors. Drafting of the manuscript: Goldin, Sheets, Kuo, and Chen. Critical revision of the manuscript for important intellectual content: Goldin, Sheets, Wu, Stürmer, Godley, Carpenter, and Chen. Statistical analysis: Meyer, Kuo, Wu, and Stürmer. Obtained funding: Goldin, Stürmer, Carpenter, and Chen. Administrative, technical, and material support: Goldin, Carpenter, and Chen. Study supervision: Meyer, Godley, Carpenter, and Chen.
Conflict of Interest Disclosures: Dr Stürmer receives investigator-initiated research funding and support as principal investigator (R01 AG023178) from the National Institute on Aging at the National Institutes of Health. He also receives research funding as principal investigator of the University of North Carolina Developing Evidence to Inform Decisions About Effectiveness (DEcIDE) center from the Agency for Healthcare Research and Quality. Dr Stürmer does not accept personal compensation of any kind from any pharmaceutical company, although he receives salary support from the Center for Pharmacoepidemiology and from unrestricted research grants from pharmaceutical companies (GlaxoSmithKline, Merck, and Sanofi) to the Department of Epidemiology, University of North Carolina at Chapel Hill.
Funding/Support: This study was funded through contract HHSA29020050040I from the Agency for Healthcare Research and Quality, US Department of Health and Human Services, as part of the DEcIDE program. Work on this study was supported by the Integrated Cancer Information and Surveillance System, University of North Carolina Lineberger Comprehensive Cancer Center, with funding provided by the University Cancer Research Fund via the State of North Carolina.
Disclaimer: The authors of the report are responsible for its content. Statements in the report should not be construed as endorsement by the Agency for Healthcare Research and Quality or the US Department of Health and Human Services.
Previous Presentation: The study was presented orally at the Annual Meeting of the American Society for Radiation Oncology; October 4, 2011; Miami Beach, Florida.
Additional Contributions: Jane Darter, BA, Seth Tyree, MS, and Laura Hendrix, MS, provided technical assistance; William Lawrence, MD, MS, provided assistance with the study and manuscript. We acknowledge the Centers for Medicare & Medicaid Services and the SEER program tumor registries in the creation of the SEER-Medicare database.