Multicenter study of ZAP-70 expression in patients with B-cell chronic lymphocytic leukemia using an optimized flow cytometry method
| Title: | Multicenter study of ZAP-70 expression in patients with B-cell chronic lymphocytic leukemia using an optimized flow cytometry method |
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| Authors: | Nathalie Gachard, Aurélie Salviat, Catherine Boutet, Christine Arnoulet, Françoise Durrieu, Bernard Lenormand, Stéphane Leprêtre, Sylviane Olschwang, Fabrice Jardin, Marina Lafage-Pochitaloff, Dominique Penther, Danielle Sainty, Liliane Reminieras, Jean Feuillard, Marie C. Béné |
| Source: | Haematologica, Vol 93, Iss 2 (2008) |
| Publisher Information: | Ferrata Storti Foundation, 2008. |
| Publication Year: | 2008 |
| Collection: | LCC:Diseases of the blood and blood-forming organs |
| Subject Terms: | Diseases of the blood and blood-forming organs, RC633-647.5 |
| More Details: | Background Flow cytometry allows specific assessment of the expression of ZAP-70, a promising new prognostic factor in B-cell chronic lymphocytic leukemia (B-CLL), but suffers from a lack of multicenter standardization.Design and Methods An optimized method for direct detection of ZAP-70 in flow cytometry was tested in a multicenter fashion. Adapted for frozen cells, this method includes a normalization step by addition of B cells from a pool of peripheral blood mononuclear cells collected from normal donors. ZAP-70 expression levels were assessed for 153 patients with typical B-cell chronic lymphocytic leukemia chronic lymphocytic leukemia. Results were expressed as the ratio of ZAP-70 mean fluorescence intensity between B-CLL cells and normal B cells.Results The statistically optimized cut-off of ZAP-70 positivity was a ratio of 1.4. Concordance between ZAP-70 and CD38 expression was 67%. Concordance between the mutational status of IgVH genes and ZAP-70 or CD38 expression was 87% and 65%, respectively. ZAP-70 was significantly expressed in 28%, 54% and 61% of patients with Binet stages A, B and C B-cell chronic lymphocytic leukemia, respectively (p=0.008). The absence of ZAP-70 expression was associated with isolated del(13q14), a cytogenetic abnormality with a good prognosis, while most patients with the del(17p13) poor prognosis cytogenetic marker expressed ZAP-70 (p |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 0390-6078 1592-8721 |
| Relation: | https://haematologica.org/article/view/4742; https://doaj.org/toc/0390-6078; https://doaj.org/toc/1592-8721 |
| DOI: | 10.3324/haematol.11622 |
| Access URL: | https://doaj.org/article/e620780614d84be09c6edb0c2167f040 |
| Accession Number: | edsdoj.620780614d84be09c6edb0c2167f040 |
| Database: | Directory of Open Access Journals |
| ISSN: | 03906078 15928721 |
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| DOI: | 10.3324/haematol.11622 |
| Published in: | Haematologica |
| Language: | English |