Abstract
Intratumoral hypoxia is prevalent in many solid tumors and is a marker of poor clinical prognosis in prostate cancer. The presence of hypoxia is associated with increased chromosomal instability, gene amplification, downregulation of DNA damage repair pathways, and altered sensitivity to agents that damage DNA. These genomic changes could also lead to oncogene activation or tumor suppressor gene inactivation during prostate cancer progression. We review here the concept of repair-deficient hypoxic tumor cells that can adapt to low oxygen levels and acquire an aggressive “unstable mutator” phenotype. We speculate that hypoxia-induced genomic instability may also be a consequence of aberrant mitotic function in hypoxic cells, which leads to increased chromosomal instability and aneuploidy. Because both hypoxia and aneuploidy are prognostic factors in prostate cancer, a greater understanding of these biological states in prostate cancer may lead to novel prognostic and predictive tests and drive new therapeutic strategies in the context of personalized cancer medicine.
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Acknowledgements
This work was financially supported in part by the Ontario Ministry of Health and Long Term Care, The Terry Fox Foundation/Research Institute (New Frontiers Research Program PPG09-020005 to R.G.B.), the Ontario Institute for Cancer Research and the Canadian Foundation for Innovation. R.G.B. is a Canadian Cancer Society Research Scientist Prostate Cancer Canada (CPC-GENE project; with monies from the Movember Foundation), and A.D. was awarded a Canadian Urology Oncology Group fellowship. The views expressed in this chapter do not necessarily reflect those of the Ontario Ministry of Health and Long Term Care.
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Taiakina, D., Pra, A.D., Bristow, R.G. (2014). Intratumoral Hypoxia as the Genesis of Genetic Instability and Clinical Prognosis in Prostate Cancer. In: Koumenis, C., Hammond, E., Giaccia, A. (eds) Tumor Microenvironment and Cellular Stress. Advances in Experimental Medicine and Biology, vol 772. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-5915-6_9
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