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Clinical application of cDNA microarrays in oncology
Lajos Pusztai1, Mark Ayers, James Stec
1Department of Breast Medical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA. lpusztai@mdanderson.org
Abstract:
DNA microarrays represent an important new tool to analyze human tissues. The technology enables investigators to measure the expression of several thousand mRNA species simultaneously in a biological specimen. This process, called transcriptional profiling, represents a technological breakthrough in the analysis of biological specimens. It may be used to screen for individual genes that are differentially expressed between normal and diseased tissues in the hope of finding novel targets for drug development or finding new single-gene markers of clinical outcome. Microarrays are also applied to learn about the complex biology of cancer by simultaneously monitoring interactions between hundreds of genes during experimental conditions in vitro or during therapy in vivo. Analysis of gene expression patterns may also be used as a classification tool to sort cancer into various clinically relevant subgroups that is not currently possible with other methods. The first clinically important applications of this technology will likely be its use as a tool to refine diagnosis and improve the accuracy of predictions of prognosis and response to therapy. DNA microarrays in several "proof-of-principle" experiments have demonstrated that they can predict important clinical outcomes, including outcomes that cannot currently be predicted with other methods, but the true clinical utility and the limits of this exciting new technology are yet to be established. This paper reviews the current methodology and applications of this technique as they relate to clinical oncology.
Insights
DNA microarrays, a powerful tool for transcriptional profiling, analyze thousands of mRNAs simultaneously. This technology aids in discovering novel drug targets and refining cancer diagnosis and prognosis.
Area of Science:
- Oncology
- Molecular Biology
- Bioinformatics
Background:
- DNA microarrays enable simultaneous measurement of thousands of mRNA species in biological specimens.
- Transcriptional profiling using microarrays is a breakthrough in analyzing biological specimens.
- This technology offers new avenues for understanding complex biological processes.
Purpose of the Study:
- To review the methodology and applications of DNA microarrays in clinical oncology.
- To explore the potential of microarrays in identifying differentially expressed genes between normal and diseased tissues.
- To highlight the use of microarrays in cancer biology research and classification.
Main Methods:
- Simultaneous measurement of thousands of mRNA species.
- Transcriptional profiling of biological specimens.
- In vitro and in vivo monitoring of gene interactions.
Main Results:
- DNA microarrays can screen for differentially expressed genes, aiding in drug development and biomarker discovery.
- Gene expression patterns from microarrays can classify cancers into clinically relevant subgroups.
- Proof-of-principle experiments show microarrays can predict clinical outcomes.
Conclusions:
- DNA microarrays are a valuable tool for refining cancer diagnosis, prognosis, and therapy response prediction.
- The technology has the potential to uncover novel drug targets and biomarkers.
- Further research is needed to establish the full clinical utility and limitations of DNA microarrays.