[Immunophenotype analysis of leukemic mantle cell lymphoma].

Mantle cell lymphoma (MCL) is a kind of mature B-cell neoplasms with significantly poor prognosis and is usually misdiagnosed. With the development of flow cytometry and cytogenetic technique, most patients were at leukemic phase when diagnosed. This study was purposed to investigate the immunophenotypes of MCL, the immunophenotype information of 22 leukemic MCL patients was analyzed retrospectively. All the patients were conformed t(11;14) translocation by fluorescence in situ hybridization. Immunophenotypes were detected by a four-color flow cytometry including CD3, CD4, CD5, CD8, CD10, CD19, CD20, CD22, CD23, CD25, CD38, CD103, CD148, CD200, FMC7, ZAP-70, κ, λ. The results showed that CD19, CD5, CD20 and monoclonal sIg expressed in all 22 patients with CD20 high expression; CD22 expressed weakly in 17 patients; CD23 expressed in 6 patients including 2 cases highly expressed; FMC7 expressed in 12 patients. 5 patients were 4-point score and 17 patients had a score less than 4 according to CLL scoring system. CD148 and CD200 were detected in 18 patients, in which CD200 expressed negatively in 11 patients, CD200 expressed weakly in 7 patients with median fluorescence intensity (MFI) 25.8 (6.6 - 254.26); CD148 expressed positively in all 18 patients with median MFI: 337 (73.4 - 1341.9). It is concluded that the atypical immunophenotype is common in leukemia MCL, thereby the diagnosis of MCL needs comprehensively analyze with morphocytology, immunophenotype and cytogenetic, CD200 and CD148 as new bio-markers can differentiate MCL from chronic B cell lymphoproliferative disease.