Journal of Clinical Oncology, Vol 8, 431-442, Copyright © 1990 by American Society of Clinical Oncology

ARTICLES

Characterization of immunoglobulin and T-cell receptor gene patterns in B-cell precursor acute lymphoblastic leukemia of childhood

CA Felix, DG Poplack, GH Reaman, SM Steinberg, DE Cole, BJ Taylor, CG Begley and IR Kirsch
Navy Medical Oncology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892.

Immunoglobulin (Ig) and T-cell receptor (TCR) genes were examined in the lymphoblasts of 70 children with immunophenotypically defined B- cell precursor acute lymphoblastic leukemia (ALL). The most frequent genes to rearrange were Ig heavy (H) chain (93%) and TCR delta (79%), followed by TCR gamma (49%), Ig kappa and/or lambda light (L) chain (46%), TCR alpha (46%), and TCR beta (29%). Thus, despite their putative "B-cell precursor" lineage, these leukemias manifest a remarkably high incidence of TCR gene rearrangements. While certain patterns predominate, there is considerable heterogeneity in Ig and TCR genotypes in this disease. No significant associations were found between Ig and TCR genotype and commonly used prognostic factors including age, sex, race, WBC, French-American-British (FAB) subtype, or cytogenetics. However, the lymphoblasts of three of six patients who failed to achieve initial remission had germline patterns of every Ig and TCR gene, a genotype not observed in the leukemic cells from any of the 64 patients who achieved complete remission (p2 = .0007). This study suggests that particular Ig and TCR genotypes may be of clinical relevance in childhood B-cell precursor ALL. The finding of rearranged TCR genes in a large proportion of cases raises fundamental questions about early lineage commitment and lymphocyte differentiation along B- cell and T-cell pathways.
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