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Prostate. 2012 Feb;72(3):301-6. doi: 10.1002/pros.21432. Epub 2011 Jun 28.

α-Methylacyl-CoA racemase expression and lethal prostate cancer in the Physicians' Health Study and Health Professionals Follow-up Study.

Author information

1
Department of Pathology, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts, USA. marcbarry@salud.unm.edu

Abstract

BACKGROUND:

α-Methylacyl-CoA racemase (AMACR) is an enzyme that serves as a diagnostic biomarker of prostate cancer in clinical practice. Recent studies suggest that low AMACR expression is associated with biochemical recurrence and the development of fatal disease.

METHODS:

We conducted a prospective cohort study among 920 men aged 47-84 years, who were diagnosed with prostate cancer in the Physicians' Health Study and the Health Professionals Follow-up Study cohorts, and whose resected tissue specimens were available for immunohistochemical analysis. We used Cox proportional hazards regression to evaluate the association of AMACR expression with lethal prostate cancer over a 20-year follow-up period.

RESULTS:

In total, 68 men died from prostate cancer, and an additional 18 developed bony metastases during follow-up. We found that lower AMACR intensity was associated with higher prostate-specific antigen levels (P = 0.003) and more advanced clinical stage (P = 0.06) at diagnosis, and a nonsignificant trend for higher risk of lethal outcomes. The hazard ratio (HR) comparing the lowest to the highest quartile of AMACR expression intensity was 1.53 ((95% CI: 0.86-2.73), P-for-trend across quartiles = 0.07); this trend was further attenuated after adjustment for age, Gleason score, stage, and cohort with a HR of 1.24 (95% CI: 0.69-2.22), P-for-trend = 0.23.

CONCLUSIONS:

Low AMACR expression in primary tumor specimens was not independently associated with the development of metastatic and lethal prostate cancer after treatment over a 20-year follow-up period, after adjustment for important clinical covariates at diagnosis.

PMID:
21713964
PMCID:
PMC3267640
DOI:
10.1002/pros.21432
[Indexed for MEDLINE]
Free PMC Article

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