B-prolymphocytic leukemia shows heterogeneous IgVH mutational status and expression of ZAP-70 and CD38
| Autor: | Daniel Catovsky, Nnenna Osuji, Estella Matutes, N Parry-Jones, Zadie Davis, David Oscier, Vasantha Brito-Babapulle, Ilaria Del Giudice, Andrew Wotherspoon |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Oncology
medicine.medical_specialty Immunology Cell Biology Hematology Biology CD38 medicine.disease Biochemistry law.invention Immunophenotyping law Internal medicine medicine Chromosome abnormality Immunoglobulin heavy chain Trisomy Prolymphocytic leukemia Polymerase chain reaction Lymphoid leukemia |
| Popis: | B-cell prolymphocytic leukemia (B-PLL) is a rare lymphoid leukemia with an aggressive course. Diagnosis is based on morphology (>55% peripheral blood prolymphocytes), immunophenotype and histology when available, as there is no cytogenetic hallmark for this disease. There are scanty data regarding the mutational status of the variable region of immunoglobulin heavy chain (IgVH) genes and ZAP-70 expression in B-PLL. Davi et al (Blood1996;88:970–6) showed that 9 of 11 B-PLL cases had mutated IgVH genes (98% homology) and ZAP-70 expression was evaluated by 4-colour flow cytometry. Seven of 13 cases (54%) in which IgVH mutational status was evaluable, showed unmutated IgVH genes (99.7–100% homology) and 6 (46%) mutated IgVH genes (90.1–97.4% homology). V3-23 and V4-34 genes were used in one third of the cases. ZAP-70 was expressed (≥ 20% CD19+ cells) in 7 of 10 evaluable cases and CD38 (≥ 30% of CD19+ cells) in 7 of 11 cases. FISH analysis showed delp53 in 6/13 (46%) and del(13)(q14) in 3/11 (27%) cases; trisomy 12 was absent in 7 cases tested. Correlation between IgVH status and other features is shown in the table. There was a prevalence of delp53 (83%) among the unmutated group, while ZAP-70 expression did not correlate with IgVH mutational status. Median overall survival was 41 months. Six patients (4 mutated, 2 unmutated) are alive at 50 months (range 8-112) from diagnosis, 9 (5 unmutated and 2 mutated) died at 17 months (range 0–55) and 1 was lost to follow-up at 4 months. The number of patients is too small to conclude whether IgVH mutational status and/or ZAP-70 expression have a significant impact on survival. In summary, B-PLL is heterogeneous with respect to IgVH mutational status as in most chronic B-cell disorders, with equal representation of unmutated and mutated cases. P53 deletion is more common in the unmutated subgroup and most of the cases express ZAP-70 and CD38. Laboratory findings according to mutational status ZAP (>/=20%) CD38 (>/=30%) Del p53 Del (13)(q14) Trisomy 12 Unmutated (7) 4/5 1/4 5/6 2/5 0/3 Mutated (6) 2/3 4/5 1/5 0/4 0/4 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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