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Updated: Jul 31, 2026
Microarray-based Identification of Individual HERV Loci Expression: Application to Biomarker Discovery in Prostate Cancer
Published on: November 2, 2013
Chromosomal changes in locally recurrent, hormone-refractory prostate carcinomas by karyotyping and comparative
K Haapala1, A Rökman, C Palmberg
1Department of Clinical Genetics, Tampere University Hospital, P.O. Box 2000, FIN-33521, Tampere, Finland.
Abstract:
The genetic mechanisms of prostate cancer recurrence during hormonal therapy are largely unknown. So far, data from conventional karyotype analysis on hormone-refractory prostate carcinomas have not been published, mainly because of the difficulties in obtaining fresh hormone-refractory prostate carcinoma samples and getting metaphases from them. Here, we have studied chromosomal changes in 12 locally recurrent, hormone-refractory prostate carcinomas using karyotyping and CGH that revealed genetic aberrations in all tumors. Loss of the Y chromosome was the most common (89%) finding, and tetraploidy or near-tetraploidy was detected in all tumors. Also non-random translocations were found in 56% of the tumors. The present study indicates that clonal chromosomal aberrations in hormone-refractory prostate carcinomas are more common than in untreated primary tumors, and also, further studies on the frequency and significance of translocations in prostate carcinoma progression during hormonal therapy are warranted.
Insights
Genetic changes in recurrent prostate cancer are unclear. This study found common chromosomal aberrations, including Y chromosome loss and tetraploidy, in hormone-refractory prostate carcinomas, suggesting increased genomic instability during treatment resistance.
Area of Science:
- Genetics
- Oncology
- Urology
Background:
- The genetic underpinnings of prostate cancer recurrence during hormonal therapy remain largely unknown.
- Conventional karyotype analysis data for hormone-refractory prostate carcinomas are scarce due to challenges in sample acquisition and metaphase preparation.
Purpose of the Study:
- To investigate chromosomal aberrations in locally recurrent, hormone-refractory prostate carcinomas.
- To compare the frequency of genetic alterations in hormone-refractory tumors versus untreated primary prostate tumors.
Main Methods:
- Karyotyping and comparative genomic hybridization (CGH) were employed.
- Analysis was performed on 12 samples of locally recurrent, hormone-refractory prostate carcinoma.
Main Results:
- All analyzed tumors exhibited genetic aberrations.
- Loss of the Y chromosome was observed in 89% of cases.
- Tetraploidy or near-tetraploidy was present in all tumors, and non-random translocations were found in 56%.
Conclusions:
- Hormone-refractory prostate carcinomas display more frequent clonal chromosomal aberrations than untreated primary tumors.
- Further research is warranted to elucidate the significance of translocations in prostate cancer progression during hormonal therapy.
