Abstract:
:A case of acute lymphoblastic leukemia (ALL) was encountered in which the two clonal gamma T-cell receptor gene (TCR gamma) rearrangements found in bone marrow (BM) samples at relapse both differed from the single clonal TCR gamma rearrangement present in BM obtained at diagnosis 5 years previously. In contrast, two clonal Ig heavy chain gene (IgH) rearrangements present at relapse were identical to those present at diagnosis. Comparison of the DNA sequences of the relapse TCR gamma rearrangements with that of the diagnostic TCR gamma rearrangement indicated that they must have been generated de novo from TCR gamma loci in germline configuration. By polymerase chain reaction using clonotypic N-region oligonucleotide primers (N-PCR), cells bearing the diagnosis or relapse TCR gamma rearrangements were undetectable in the sample from the opposite time point. Two BM samples obtained at different times in clinical remission were both devoid of detectable residual tumor when analyzed by N-PCR, indicating a depth of remission of less than 1 tumor cell per 4 x 10(5) BM mononuclear cells. The tumor cells showed a primitive phenotype: T-cell antigen-negative, CALLA/CD10-negative, CD20-negative, CD19-positive, and positive for the myeloid marker My9. This case, which appears to represent a tumor arising from a progenitor cell with both early B-lineage and certain stem cell features, has implications for monitoring residual ALL and possibly also for treatment of the disease.
journal_name
Bloodjournal_title
Bloodauthors
Tycko B,Ritz J,Sallan S,Sklar Jsubject
Has Abstractpub_date
1992-01-15 00:00:00pages
481-8issue
2eissn
0006-4971issn
1528-0020journal_volume
79pub_type
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