At any given time in each cell in the body, thousands of different genes are active. Until recently, it has not been possible to capture and compare the patterns of gene expression present in different cells in any systematic way. DNA microarrays allow the comparison of thousands of genes that can be measured simultaneously, and the information gained using these arrays is dramatically changing cancer-treatment decisions.
![Finding Genes With Microarrays](https://webarchive.library.unt.edu/eot2008/20090131052907im_/http://newscenter.cancer.gov/images/Documents/abd6d05e-f179-4ec1-8376-6d4992583274/cancer11.jpg)
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