The use of expression profiling for cancer diagnosis has been demonstrated for the classification of several cancers, including breast cancer, lung cancer, and others (Table 29-1). The potential applications of this new technology for elucidating disease mechanisms are vast. The possible genes and proteins for therapeutic drug and gene targeting may be identified with significant diagnostic, therapeutic, and disease-monitoring implications. The ability to work with limited amounts of starting RNA has improved such that sufficient quantities of RNA for microarray analysis can be extracted from formalin-fixed, paraffin-embedded tissues. This advance should increase
Table 29-1. DNA Microarrays Used to Classify Solid Tumors
Tumor Technology Reference
Lung Oligonucleotide array 14
Prostate Oligonucleotide array 16
Breast cDNA array 17
cDNA array 18
Spotted oligonucleotide array 19
Small round Oligonucleotide array 20
blue cell tumors
the potential clinical applications for archival pathology tissues. Neoplastic cells purified by microdissection or flow cytometry sorting can be isolated from small clinical biopsies to increase the number of samples for a given study or for clinical testing in the future.
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