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Technical Advances |







From the Department of Molecular Oncology,*
John Wayne
Cancer Institute, Santa Monica; the Division of
Hematology-Oncology,
Department of Pediatrics,
Childrens Hospital Los Angeles, University of Southern California
School of Medicine Los Angeles; and the Childrens Cancer
Group,
Arcadia, California
GalNAcß1-4(NeuAc
2-3)Galß1-4Glcß1-Cer
(GM2)/GalNAcß1-4(NeuAc
2-8NeuAc
2-3)Galß1-4Glcß1-1Cer
(GD2) synthetase
[ß-1,4-N-acetyl-galactosaminyl transferase
(GalNAc-T)] mRNA, which encodes a key glycosyltransferase for
ganglioside GD2 synthesis, was assessed as a molecular marker
for detecting metastatic neuroblastoma cells in bone marrow (BM).
GalNAc-T mRNA expression by neuroblastoma cell lines
(n = 15), primary untreated neuroblastoma
tumors (n = 29), morphologically normal BM
(n = 22), peripheral blood stem cells
(n = 10) from patients with cancers other than
neuroblastoma, and blood mononuclear cells from normal donors
(n = 17) was assessed by using reverse
transcriptase-polymerase chain reaction (RT-PCR) and
electrochemiluminescence detection assay (RT-PCR/ECL). BM harvested
from 15 neuroblastoma patients was tested before and after ex
vivo immunomagnetic bead purging, and results were
compared to immunocytological analysis of the same specimens. All
neuroblastoma cell lines (mean, 653 x 103 ECL
units) and primary tumors (mean, 683 x 103
ECL units) were positive for significant expression of GalNAc-T mRNA
compared to normal blood and BM cells. The RT-PCR/ECL assay could
detect GalNAc-T mRNA in 100 pg of total RNA, and in a mixture
of one neuroblastoma cell among 107 normal BM or blood
cells. Eight of 15 autologous BM cells harvested from patients with
neuroblastoma had tumor cells detectable by immunocytology, and
all 15 were positive for GalNAc-T mRNA. After ex vivo
purging, none of the BM cells was
immunocytology-positive, but six remained positive by the
RT-PCR/ECL assay. GalNAc-T mRNA provides a specific and sensitive
molecular marker for RT-PCR/ECL detection of infrequent neuroblastoma
cells in BM.
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