Diagnostic importance of CD179a/b as markers of precursor B-cell lymphoblastic lymphoma.
ABSTRACT Surrogate light chains consisting of VpreB (CD179a) and lambda5 (CD179b) are expressed in precursor B cells lacking a complete form of immunoglobulin and are thought to act as substitutes for conventional light chains. Upon differentiation to immature and mature B cells, CD179a/b disappear and are replaced with conventional light chains. Thus, these molecules may be useful as essential markers of precursor B cells. To examine the expression of the surrogate light-chain components CD179a and CD179b in precursor B-cell lymphoblastic lymphoma, we analyzed tissue sections using immunohistochemistry techniques. Among a number of monoclonal antibodies for the surrogate light chains, VpreB8 and SL11 were found to detect CD179a and CD179b, respectively, in acetone-fixed fresh frozen sections. Moreover, we also observed VpreB8 staining in formalin-fixed, paraffin-embedded sections. Using these antibodies, we found that CD179a/b were specifically expressed in precursor B-cell lymphoblastic lymphomas, but not in mature B-cell lymphomas in childhood. Furthermore, other pediatric tumors that must be included in a differential diagnosis of precursor B-cell lymphoblastic lymphoma, including precursor T-cell lymphoblastic lymphoma, extramedullary myeloid tumors, and Ewing sarcoma, were also negative for both CD179a and CD179b. Our data indicate that CD179a and CD179b may be important markers for the immunophenotypic diagnosis of precursor B-cell lymphoblastic lymphomas.
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ABSTRACT: Precursor B-cell lymphoblastic lymphoma (B-LBL) is a rare neoplasm composed of immature lymphocytes that demonstrate lymphoblastic morphology and express precursor and B-cell marker. It usually affects people of younger age group and causes multiple nodules on the head and neck area. The neoplasm is rare in old age. We report a case of B-LBL occurring in a 65-year-old man. He presented with multiple skin nodules on the scalp, the neck and the arm for 2 months. Histopathologic examination demonstrated diffuse dermal and subcutaneous monotonous infiltrates of medium-sized lymphoid cells with starry-sky pattern. Immunohistochemical study showed that the lymphoid cells of infiltrate showed precursor B-cell type. The patient has received combination chemotherapy three times and is being followed-up at the outpatient clinic.Journal of Cutaneous Pathology 10/2006; 33(9):649-53. · 1.77 Impact Factor
Article: Lymphoblastic lymphoma in adults.[show abstract] [hide abstract]
ABSTRACT: Understanding of the pathogenesis and biology of precursor T-cell and B-cell neoplasms has advanced significantly with the description of gene expression profiling studies, especially in T-cell disease. These studies have demonstrated leukemic arrest at various stages of thymocyte maturation, characterized by gene expression signatures with prognostic significance. Optimal treatment strategies for adult lymphoblastic lymphoma are uncertain, although current evidence supports the use of regimens similar to those used in acute lymphoblastic leukemia, with intensive induction therapy, central nervous system prophylaxis, and prolonged consolidation maintenance therapy. Current studies do not demonstrate a benefit from stem cell transplantation in first remission, although this approach is probably beneficial in relapsed disease. Identification of new therapeutic targets by further molecular studies is required.Current Hematologic Malignancy Reports 12/2006; 1(4):241-7.
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ABSTRACT: We have previously reported the effects of age and diet on nutrient digestibility, intestinal morphology, and large intestinal fermentation patterns in healthy young adult and senior dogs. However, a genome-wide molecular analysis of colonic mucosa as a function of age and diet has not yet been performed in dogs. Colonic mucosa samples were collected from six senior (12-year old) and six young adult (1-year old) female beagles fed one of two diets (animal protein-based vs. plant protein-based) for 12 months. Total RNA in colonic mucosa was extracted and hybridized to Affymetrix GeneChip® Canine Genome Arrays. Results indicated that the majority of gene expression changes were due to age (212 genes) rather than diet (66 genes). In particular, the colonic mucosa of senior dogs had increased expression of genes associated with cell proliferation, inflammation, stress response, and cellular metabolism, whereas the expression of genes associated with apoptosis and defensive mechanisms were decreased in senior vs. young adult dogs. No consistent diet-induced alterations in gene expression existed in both age groups, with the effects of diet being more pronounced in senior dogs than in young adult dogs. Our results provide molecular insight pertaining to the aged canine colon and its predisposition to dysfunction and disease. Therefore, our data may aid in future research pertaining to age-associated gastrointestinal physiological changes and highlight potential targets for dietary intervention to limit their progression.PLoS ONE 01/2010; 5(9):e12882. · 3.73 Impact Factor