Extensive flow cytometric characterization of plasmacytoid dendritic cell leukemia cells.
OBJECTIVE
Accumulating evidence suggests that non-T, non-B cell CD4+CD56+ neoplasms with lymphoblastic morphology include clinically and immunophenotypically diverse entities. Although their cells of origin or classification are still controversial several entities clearly represent a distinct type of neoplasms that are clinically aggressive.


METHODS
In this work we present the immunophenotypic and genotypic features of bone marrow (BM), peripheral blood (PB), lymph node and skin lymphocytes from a patient diagnosed as plasmacytoid dendritic cell leukemia involving the skin, BM, PB, lymph nodes, liver and spleen. For determination of immunophenotypic characteristics of malignant plasmacytoid dendritic cells 73 monoclonal antibodies detecting lineage markers, chemokine receptors, cytokine receptors, activation, and co-stimulatory molecules were used.


CONCLUSIONS
The malignant cells proved to express CD4+, CD56+ lineage negative leukemia phenotype characteristically positive for CD36, CD38, CD40, CD45, CD45RA, CD68, CD123, CD184, HLA-DR, BDCA2, and granzyme-B corresponding to the preplasmacytoid dendritic cell developmental stage. The presence of CD11a/CD18, CD84, CD91, CD95, alphavbeta5, CDw197, and the absence of CD52 and CD133 in this case can be regarded as additional features of malignant cells. Completing the immunophenotypes with multidrug resistance function can provide additional information for characterizing pDC leukemia.
Gopcsa
Laszlo
L
National Medical Center, Institute of Haematology and Immunology, H-1519 Budapest, Hungary.
Banyai
Aniko
A
Jakab
Katalin
K
Kormos
Luca
L
Tamaska
Julia
J
Matolcsy
Andras
A
Gogolak
Peter
P
Rajnavolgyi
Eva
E
Paloczi
Katalin
K
D000368:Aged; D001773:Blood Cells / Q000473:pathology; D015704:CD4 Antigens; D019002:CD56 Antigen; D019070:Cell Lineage; D003713:Dendritic Cells / Q000473:pathology*; D005434:Flow Cytometry; D006801:Humans; D016130:Immunophenotyping; D007938:Leukemia / Q000473:pathology*; D008198:Lymph Nodes / Q000473:pathology; D008297:Male; D010954:Plasmacytoma / Q000473:pathology*; D012867:Skin / Q000473:pathology
D015704:CD4 Antigens; D019002:CD56 Antigen