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Previous Article | Table of Contents
Blood, 15 September 2000, Vol. 96, No. 6, pp. 2310-2313
BRIEF REPORT
Evidence that juvenile myelomonocytic leukemia can arise from
a pluripotential stem cell
Laurence J. N. Cooper,
Kevin M. Shannon,
Michael R. Loken,
Molly Weaver,
Karen Stephens, and
Eric L. Sievers
From the Departments of Pediatrics, Medicine, and
Laboratory Medicine, University of Washington, and Hematologics, Inc,
Seattle WA; and the Department of Pediatrics, University of California,
San Francisco, CA.
Children with neurofibromatosis type 1 (NF1) carry germline
mutations in one allele of the NF1 gene and are predisposed
to myeloid malignancies, particularly juvenile myelomonocytic leukemia (JMML). Disruption of the remaining NF1 allele can be found
in malignant cells. Flow cytometric cell sorting techniques to isolate the malignant cell populations and molecular genetic methods to assay
for somatic loss of the normal NF1 allele were used to
study an unusual child with NF1 and JMML who subsequently had T-cell lymphoma. The data show that malignant JMML and lymphoma cells share a
common loss of genetic material involving the normal NF1 gene and approximately 50 Mb of flanking sequence, suggesting that the
abnormal T-lymphoid and myeloid populations were derived from a common
precursor cell. These data support the hypothesis that JMML can arise
in a pluripotent hematopoietic cell.

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