Author Contributions: Dr Li 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: Li, Hassan, Day.
Acquisition of data: Li, Hassan.
Analysis and interpretation of data: Li, Morris, Liu, Hassan, Day, Bondy, Abbruzzese.
Drafting of the manuscript: Li, Day.
Critical revision of the manuscript for important intellectual content: Li, Morris, Liu, Hassan, Day, Bondy, Abbruzzese.
Statistical analysis: Li, Morris, Liu, Hassan.
Obtained funding: Li, Day, Bondy, Abbruzzese.
Administrative, technical, or material support: Li, Day, Abbruzzese.
Study supervision: Li, Hassan, Abbruzzese.
Financial Disclosures: None reported.
Funding/Support: This study was supported by National Institutes of Health grants CA98380 and CA101936 (SPORE P20) and a multidisciplinary research program grant from M. D. Anderson Cancer Center.
Role of the Sponsor: The sponsors had no role in the design and conduct of the study; in the collection, analysis, and interpretation of the data; and in the preparation, review, and approval of the manuscript.