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a Address correspondence to this author, at: Department of Urology, Mail Stop 356510, University of Washington, Seattle, WA 98195. Fax 206-543-1146; e-mail ecorey{at}u.washington.edu
The possibility of improving diagnosis of micrometastases from prostate cancer by further enhancing the detection of prostate-specific antigen-producing cells in circulation is being evaluated. We have developed a reverse transcriptase-PCR protocol with the desirable characteristics of low limit of detection, high specificity, reproducibility of response, and ease of performance. Among the procedural alterations that have contributed to these improvements are longer PCR primers, a two-step amplification cycle, and hot-start PCR. We have lowered the limit of detection to one LNCaP prostate-cancer cell in 108 peripheral blood mononuclear cells, and samples of blood and bone marrow from healthy donors have yielded no false positives. Because PCR procedures frequently exhibit tube-to-tube variability, we have incorporated a set of internal and external controls into the protocola significant advance in assuring assay reliability.
Key Words: indexing terms: cancer metastasis peripheral blood mononuclear cells
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