Faculty Collaboration Database

Factors associated with adherence to an end-of-study biopsy: lessons from the prostate cancer prevention trial (SWOG-Coordinated Intergroup Study S9217). Cancer Epidemiol Biomarkers Prev 2014 Aug;23(8):1638-48

Date

07/17/2014

Pubmed ID

25028457

Pubmed Central ID

PMC4119542

DOI

10.1158/1055-9965.EPI-14-0202

Scopus ID

2-s2.0-84905455445 (requires institutional sign-in at Scopus site)   6 Citations

Abstract

BACKGROUND: The Prostate Cancer Prevention Trial (PCPT) was a 7-year randomized, double-blind, placebo-controlled trial of the efficacy of finasteride for the prevention of prostate cancer with a primary outcome of histologically determined prevalence of prostate cancer at the end of 7 years.

METHODS: A systematic modeling process using logistic regression identified factors available at year 6 that are associated with end-of-study (EOS) biopsy adherence at year 7, stratified by whether participants were ever prompted for a prostate biopsy by year 6. Final models were evaluated for discrimination. At year 6, 13,590 men were available for analysis.

RESULTS: Participants were more likely to have the EOS biopsy if they were adherent to study visit schedules and procedures and/or were in good health (P < 0.01). Participants at larger sites and/or sites that received retention and adherence grants were also more likely to have the EOS biopsy (P < 0.05).

CONCLUSIONS: Our results show good adherence to study requirements 1 year before the EOS biopsy was associated with greater odds that a participant would comply with the invasive EOS requirement.

IMPACT: Monitoring adherence behaviors may identify participants at risk of nonadherence to more demanding study end points. Such information could help frame adherence intervention strategies in future trials.

Author List

Gritz ER, Arnold KB, Moinpour CM, Burton-Chase AM, Tangen CM, Probstfield JF, See WA, Lieber MM, Caggiano V, Moody-Thomas S, Szczepanek C, Ryan A, Carlin S, Hill S, Goodman PJ, Padberg RM, Minasian LM, Meyskens FL, Thompson IM Jr

MESH terms used to index this publication - Major topics in bold

5-alpha Reductase Inhibitors
Biopsy
Double-Blind Method
Finasteride
Humans
Male
Patient Compliance
Prostatic Neoplasms
ROC Curve
Research Design