Author Contributions: Drs Thompson, Ankerst,
and Crowley and Mss Chi and Goodman 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: Thompson, Ankerst,
Goodman; Parnes, Coltman.
Acquisition of data: Thompson, Lucia, Goodman,
Analysis and interpretation of data: Ankerst,
Chi, Lucia, Goodman, Crowley.
Drafting of the manuscript: Thompson, Ankerst,
Critical revision of the manuscript for important
intellectual content: Thompson, Ankerst, Chi, Lucia, Goodman, Crowley,
Statistical analysis: Ankerst, Chi, Goodman.
Obtained funding: Coltman.
Administrative, technical, or material support:
Study supervision: Thompson, Ankerst, Goodman,
Financial Disclosures: None reported.
Funding/Support: This study was supported in
part by Public Health Service grants CA 37429, CA 35178, CA 45808, and CA
86402 from the National Cancer Institute.
Role of the Sponsor: The National Cancer Institute
sponsored the conduct of the Prostate Cancer Prevention Trial, including collection
of primary participant information (PSA measurement and analysis, pathologic
evaluation, follow-up of participants, and initial data analysis), but had
no role in the data analysis or the decision to publish.
Acknowledgment: We thank Ruth Etzioni, PhD,
and Ross Prentice, PhD, of the Fred Hutchinson Cancer Research Center, Seattle,
Wash, for their assistance with development of the manuscript.
Reprint Requests: Southwest Oncology Group
Operations Office, 14980 Omicron Dr, San Antonio, TX 78245-3217.