Author Contributions: Dr Wong had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Wong, Mitra, Hudes, Schwartz, Armstong.
Acquisition of data: Montagnet, Armstong.
Analysis and interpretation of data: Wong, Mitra, Hudes, Localio, Wan, Armstong.
Drafting of the manuscript: Wong, Mitra, Localio.
Critical revision of the manuscript for important intellectual content: Mitra, Hudes, Localio, Schwartz, Wan, Montagnet, Armstong.
Statistical analysis: Wong, Mitra, Localio, Wan, Armstong.
Obtained funding: Armstrong.
Administrative, technical, or material support: Wan, Montagnet, Armstong.
Study supervision: Mitra, Hudes, Localio, Schwartz, Armstong.
Financial Disclosures: Dr Schwartz reports that he serves on a health outcomes advisory board for Sanofi Aventis and has applied for grant funding from Sanofi Aventis; otherwise no other financial disclosures were reported.
Funding/Support: Dr Wong was supported by grant R25 CA057708 from the National Institutes of Health when this research was conducted and is supported in part by a Clinical Research Curriculum Award (K30 RR022255) and by a University of Pennsylvania School of Medicine Scholarship. This research was sponsored by the Center for Population Health and Health Disparities at the University of Pennsylvania under Public Health Services grant P50-CA105641. This study used the linked SEER-Medicare database.
Role of the Sponsors: The funding agencies had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; and preparation, review, or approval of the manuscript.
Disclaimer: The interpretation and reporting of these data are the sole responsibility of the authors.
Acknowledgment: We appreciate the assistance from Dr Robert Uzzo, Fox Chase Cancer Center for his helpful comments on an earlier draft of the manuscript, for which he received no compensation. The authors acknowledge the efforts of the Applied Research Program, NCI; the Office of Research, Development and Information, CMS; Information Management Services (IMS) Inc; and the SEER Program tumor registries in the creation of the SEER-Medicare database.
This article was corrected on 12/12/06, pror to publication of the correction in print.