Racial differences in the PSA bounce in predicting prostate cancer outcomes after brachytherapy: Evidence from the Department of Veterans Affairs

African American men have historically had poorer prostate cancer biochemical and survival outcomes than Caucasians. However, emerging data suggest nononcologic factors drive much of this disparity. Prior evidence has suggested an association between a transient prostate specific antigen (PSA) bounc...

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Veröffentlicht in:Brachytherapy 2020-01, Vol.19 (1), p.6-12
Hauptverfasser: Slade, Alexander N., Dahman, Bassam, Chang, Michael G.
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Chang, Michael G.
description African American men have historically had poorer prostate cancer biochemical and survival outcomes than Caucasians. However, emerging data suggest nononcologic factors drive much of this disparity. Prior evidence has suggested an association between a transient prostate specific antigen (PSA) bounce and improved biochemical control. However, racial differences in this relationship have remained relatively unexplored. We identified 4477 men treated for low- or intermediate-risk prostate cancer within the U.S. Department of Veterans Affairs (VA) from 2000 to 2010 with brachytherapy alone or in combination with external beam radiotherapy without androgen deprivation. Longitudinal PSA data were used to define to biochemical failure and PSA bounce. Cox proportional hazard models were used explore racial differences in the relationship between the PSA bounce and time to biochemical failure. Thirty-one percent of our sample experienced a PSA bounce, with African Americans more likely to experience a bounce (42%) compared with Caucasians (29%); p < 0.001. Despite this, African Americans had a higher likelihood of biochemical failure (hazard ratio [HR] 1.4; p = 0.006). However, African American men experiencing a PSA bounce were less likely to experience a biochemical failure (HR = 0.64; p = 0.046), whereas this relationship was not statistically significant for Caucasians (HR = 0.78; p = 0.092). On multivariate analysis, African Americans receiving brachytherapy alone were most sensitive to the protective benefit of the PSA bounce (HR = 0.64). A PSA bounce was associated with improved biochemical control among patients receiving brachytherapy as part of their treatment for low- or intermediate-risk prostate cancer at the VA. African American men treated with brachytherapy had a particularly pronounced biochemical control benefit of a PSA bounce.
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subjects African Americans
Aged
Biochemical failure
Brachytherapy
European Continental Ancestry Group
Humans
Kallikreins - blood
Life Sciences & Biomedicine
Male
Middle Aged
Oncology
Predictive Value of Tests
Proportional Hazards Models
Prostate brachytherapy
Prostate-Specific Antigen - blood
Prostatic Neoplasms - blood
Prostatic Neoplasms - ethnology
Prostatic Neoplasms - radiotherapy
PSA bounce
Racial disparities
Radiology, Nuclear Medicine & Medical Imaging
Science & Technology
Treatment Outcome
United States
United States Department of Veterans Affairs
Veterans affairs
title Racial differences in the PSA bounce in predicting prostate cancer outcomes after brachytherapy: Evidence from the Department of Veterans Affairs
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