Critical Evaluation of Real-time Reverse Transcriptase-polymerase Chain Reaction for the Quantitative Detection of Cytokeratin 20 MRNA in Colorectal Cancer Patients

Overview

Journal J Mol Diagn

Publisher Elsevier

Specialties Molecular Biology
Pathology

Date 2005 Nov 1

PMID 16258162

Citations 10

Authors

Nadia Dandachi

Marija Balic

Stefanie Stanzer

Michael Halm

Margit Resel

Thomas Anton Hinterleitner

Hellmut Samonigg

Thomas Bauernhofer

Affiliations

Soon will be listed here.

Abstract

We evaluated the usefulness of cytokeratin 20 (CK20) mRNA expression in the quantitative detection of circulating tumor cells in the blood of patients with colorectal cancer (CRC). Blood samples from healthy volunteers (HVs; n = 37), patients with localized (n = 42) and metastatic colorectal cancer (n = 40), and patients with chronic inflammatory bowel disease (CID; n = 15) were examined. After immunomagnetic enrichment using microbeads against human epithelial antigen, total RNA was extracted, reverse transcribed, and analyzed by real-time reverse transcriptase-polymerase chain reaction using the LightCycler instrument. CK20 expression in peripheral blood was found in 46 of 82 (56%) patients with CRC, 8 of 37 (22%) HVs, and 9 of 15 (60%) patients with CID. Levels of CK20 mRNA were significantly higher in blood samples from CRC patients (median 681) than in blood samples from HVs (median 0) (P = 0.001), whereas no difference could be detected between patients with CRC and CID. Although the present technique could not distinguish CRC from CID, the method warrants further efforts to improve sample preparation and tumor cell enrichment, which may render real-time CK20 reverse transcriptase-polymerase chain reaction a feasible technique in identifying circulating tumor cells in peripheral blood of cancer patients.

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