A novel biomarker signature to predict aggressive disease in African-American men with prostate cancer.

Authors

null

Kosj Yamoah

Thomas Jefferson University, Philadelphia, PA

Kosj Yamoah , Michael Hiroshi Johnson , Voleak Choeurng , Kasra Yousefi , Zaid Haddad , Robert Benjamin Den , Priti Lal , Michael D Feldman , Adam Dicker , Eric A. Klein , Elai Davicioni , Timothy R. Rebbeck , Edward M. Schaeffer

Organizations

Thomas Jefferson University, Philadelphia, PA, Department of Urology, Johns Hopkins Medical Institutions, Baltimore, MD, GenomeDx Biosciences, Inc., Vancouver, BC, Canada, Department of Radiation Oncology, The Sidney Kimmel Cancer Center at Thomas Jefferson University, Philadelphia, PA, Abramson Cancer Center of the University of Pennsylvania, Philadelphia, PA, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, Glickman Urological and Kidney Institute, Cleveland Clinic, Cleveland, OH, Universtiy of Pennsylvania, Philadelphia, PA, Johns Hopkins Health Center, Baltimore, MD

Research Funding

No funding sources reported

Background: Numerous studies have reported a significantly higher incidence of PCa and/or adverse pathological features associated with African-American men compared to European-American men. Less however is known about the genomic disparities that exist between these two groups. In this report we compared the race-specific expression of biomarkers linked to PCa pathogenesis in a matched cohort of AA and EA men. Methods: PCa data from AA and EA patients were analyzed from four medical centers. Cases were matched based on CAPRA-S within each institution for a total sample size of 300 (121-AA; 179-EA). The distribution of mRNA expression levels of 20 validated biomarkers associated with PCa initiation and progression was compared by race using a false-discovery-rate adjusted Mann-Whitney U, and logistic regression models. Conditional logistic regression models were used to evaluate the interaction between race and biomarker expression for predicting pathologic T3 PCa. Results: Of 20 biomarkers interrogated, 6 showed statistically significant differential expression in AA compared with EA men in one or more statistical models. These include TMPRSS2-ERG (p<0.001), AMACR (p<0.001), SPINK1 (p=0.005), AR (p=0.018), SRD5A2 (p=0.005), and GSTP1 (p=0.021). Dysregulation of MYCBP (p=0.043) increases risk of pT3 disease in AA but decreases the risk in EA men, while the reverse is true for AMACR (p=0.013), TMPRSS2-ERG (p=0.026), FOXP1 (p=0.016), and GSTP1 (p=0.032). Loss-of-function mutation for tumor suppressors PTEN (p=0.046), TP53 (p=0.042), and RB1 (p=0.027), and dysregulation of AR (p=0.015), EZH2 (p=0.043), NKX3-1 (p=0.024), SRD5A2 (p=0.032), and SPOP (p=0.032) increased risk of pT3 disease for both AA and EA men. Conclusions: We have identified a subset of PCa biomarkers that predict risk of clinico-pathologic outcomes in a race-dependent manner. These biomarkers may in part explain the biological contribution to racial disparity in PCa outcomes between EA and AA men.

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Abstract Details

Meeting

2015 Genitourinary Cancers Symposium

Session Type

Poster Session

Session Title

General Poster Session A: Prostate Cancer

Track

Prostate Cancer

Sub Track

Prostate Cancer - Localized Disease

Citation

J Clin Oncol 33, 2015 (suppl 7; abstr 24)

DOI

10.1200/jco.2015.33.7_suppl.24

Abstract #

24

Poster Bd #

B16

Abstract Disclosures

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