Journal of Clinical Oncology, Vol 15, 2701-2708, Copyright © 1997 by American Society of Clinical Oncology
Limitations of reverse-transcriptase polymerase chain reaction analyses for detection of micrometastatic epithelial cancer cells in bone marrow
A Zippelius, P Kufer, G Honold, MW Kollermann, R Oberneder, G Schlimok, G Riethmuller and K Pantel
Institut fur Immunologie der Universitat Munchen, Germany.
PURPOSE: This study was designed to evaluate the potential of reverse-
transcriptase polymerase chain reaction (RT-PCR) analyses for the detection
of micrometastatic carcinoma cells in bone marrow (BM). PATIENTS AND
METHODS: The specificity of RT-PCR assays with primers specific for various
tumor-associated and organ-specific mRNA species was examined by analysis
of 53 BM aspirates from control patients with no epithelial malignancy. In
addition, BM samples from 63 patients with prostate cancer (n = 53) or
breast cancer (n = 10) were analyzed by RT- PCR with primers specific for
prostate-specific antigen (PSA) mRNA. As a reference method, all samples
were analyzed simultaneously by an established immunocytochemical assay,
using monoclonal antibodies (mAbs) against cytokeratins (CK) for tumor-cell
detection. RESULTS: Seven of eight marker species could be detected in a
considerable number of BM samples from control patients: epithelial
glycoprotein-40 (EGP-40; 53 of 53 samples), desmoplakin I (DPI I; five of
five), carcinoembryonic antigen (CEA; five of 19), erb-B2 (five of seven),
erb- B3 (six of seven), prostate-specific membrane antigen (PSM; four of
nine), and CK18 (five of seven). Only PSA mRNA was not detected in any of
the 53 control BM samples. In serial dilution experiments, the PSA RT-PCR
assay was able to detect five LNCaP prostate carcinoma cells in 4 x 10(6)
BM cells. CK-positive cells were found in 20 patients (37.7%) with prostate
cancer, while PSA mRNA was found in only 15 (28.3%; P = .04). Moreover,
despite the recent observation that PSA is also expressed in mammary
carcinomas, none of the 10 CK-positive BM samples were PSA mRNA-positive.
CONCLUSION: Limiting factors in the detection of micrometastatic tumor
cells by RT-PCR are (1) the illegitimate transcription of tumor-associated
or epithelial-specific genes in hematopoietic cells, and (2) the deficient
expression of the marker gene in micrometastatic tumor cells.
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