Molecular Alterations in Primary Prostate Cancer after Androgen Ablation Therapy
Purpose: After an initial response to androgen ablation, most prostate tumors recur, ultimately progressing to highly aggressive androgen-independent cancer. The molecular mechanisms underlying progression are not well known in part due to the rarity of androgen-independent samples from primary and...
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Published in | Clinical cancer research Vol. 11; no. 19; pp. 6823 - 6834 |
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Main Authors | , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
Philadelphia, PA
American Association for Cancer Research
01.10.2005
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Subjects | |
Online Access | Get full text |
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Summary: | Purpose: After an initial response to androgen ablation, most prostate tumors recur, ultimately progressing to highly aggressive androgen-independent
cancer. The molecular mechanisms underlying progression are not well known in part due to the rarity of androgen-independent
samples from primary and metastatic sites.
Experimental Design: We compared the gene expression profiles of 10 androgen-independent primary prostate tumor biopsies with 10 primary, untreated
androgen-dependent tumors. Samples were laser capture microdissected, the RNA was amplified, and gene expression was assessed
using Affymetrix Human Genome U133A GeneChip. Differential expression was examined with principal component analysis, hierarchical
clustering, and Student's t testing. Analysis of gene ontology was done with Expression Analysis Systematic Explorer and gene expression data were integrated
with genomic alterations with Differential Gene Locus Mapping.
Results: Unsupervised principal component analysis showed that the androgen-dependent and androgen-independent tumors segregated from
one another. After filtering the data, 239 differentially expressed genes were identified. Two main gene ontologies were found
discordant between androgen-independent and androgen-dependent tumors: macromolecule biosynthesis was down-regulated and cell
adhesion was up-regulated in androgen-independent tumors. Other differentially expressed genes were related to interleukin-6
signaling as well as angiogenesis, cell adhesion, apoptosis, oxidative stress, and hormone response. The Differential Gene
Locus Mapping analysis identified nine regions of potential chromosomal deletion in the androgen-independent tumors, including
1p36, 3p21, 6p21, 8p21, 11p15, 11q12, 12q23, 16q12, and 16q21.
Conclusions: Taken together, these data identify several unique characteristics of androgen-independent prostate cancer that may hold
potential for the development of targeted therapeutic intervention. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Present address: Molecular Therapeutics Program, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892 |
ISSN: | 1078-0432 1557-3265 |
DOI: | 10.1158/1078-0432.CCR-05-0585 |