Immunophenotypic Features (immunophenotypic + feature)

Distribution by Scientific Domains
Distribution within Medical Sciences


Selected Abstracts


Immunophenotypic features of MELF pattern invasion in endometrial adenocarcinoma: evidence for epithelial,mesenchymal transition

HISTOPATHOLOGY, Issue 1 2009
Colin J R Stewart
Aims:, Endometrial endometrioid adenocarcinomas (EEC) may show a distinctive morphological alteration characterized by the presence of microcystic, elongated and fragmented (,MELF') glands. These changes share features of epithelial,mesenchymal transition (EMT) in carcinomas arising at other sites. The aim was to compare the immunophenotypic profile of MELF-type epithelium with conventional glandular areas of EEC. Methods and results:, Twenty-one EEC were stained immunohistochemically for cytokeratin (CK) AE1/AE3, CK7, vimentin, oestrogen receptor, progesterone receptor and E-cadherin. Conventional tumour glands usually showed preserved membranous E-cadherin immunoreactivity with peripheral accentuation of vimentin and hormone receptor expression. MELF-type invasion was characterized by strong CK7 expression, sometimes in contrast to adjacent unstained tumour glands. MELF areas were usually negative for hormone receptors and showed reduced E-cadherin expression. Conclusions:, The expression of hormone receptors and intermediate filaments shows specific distribution patterns within EEC. MELF pattern invasion shows an altered immunophenotype compared with conventional glandular tumour areas. These findings suggest that MELF-type invasion represents a specific tumour alteration, and the reduction in hormone receptor and E-cadherin expression would be consistent with EMT. Immunohistochemical studies of EEC should consider micro anatomical variations in immunoreactivity, since these may be relevant to tumour invasion and progression. [source]


Bone marrow cells from myelodysplastic syndromes show altered immunophenotypic profiles that may contribute to the diagnosis and prognostic stratification of the disease: A pilot study on a series of 56 patients,

CYTOMETRY, Issue 3 2010
Sergio Matarraz
Abstract A heterogeneous spectrum of immunophenotypic abnormalities have been reported in myelodysplastic syndromes (MDS). However, most studies are restricted to the analysis of CD34+ cells and/or other major subsets of CD34, cells, frequently not exploring the diagnostic and prognostic impact of immunophenotyping. Methods: We propose for the first time an immunophenotypic score (IS) based on the altered distribution and immunophenotypic features of maturing/mature compartments of bone marrow (BM) hematopoietic cells in 56 patients with MDS that could contribute to a refined diagnosis and prognostic evaluation of the disease. Results: Although MDS-associated phenotypes were detected in reactive BM, the overall immunophenotypic profile of BM cells allowed an efficient discrimination between MDS and both normal and reactive BM, once the number and degree of severity of the abnormalities detected per patient were simultaneously considered in the proposed IS. Interestingly, increasingly higher IS were found among patients with MDS showing adverse prognostic factors and in low- versus high-grade cases. The most informative prognostic factors included the number of CD34+ cells, presence of aberrant CD34,/CD117+ precursors, decreased mature neutrophils and CD34, erythroid precursors, and increased numbers of CD36,/lo erythroid precursors; in addition, the IS was an independent prognostic factor for overall survival. Conclusions: Assessment of immunophenotypic abnormalities of maturing/mature BM cells allows an efficient discrimination between MDS and both normal and reactive BM, once the number and degree of severity of the abnormalities detected are simultaneously scored. Interestingly, progressively higher IS were found among patients with MDS with adverse prognostic features and shorter overall survival. © 2010 Clinical Cytometry Society [source]


Fine-needle aspiration of metastatic prostatic neuroendocrine carcinomas: Cytomorphologic and immunophenotypic features

DIAGNOSTIC CYTOPATHOLOGY, Issue 8 2008
Guoping Cai M.D.
Abstract Metastatic prostatic carcinoma may, in rare occasions, present as a neuroendocrine tumor. Its recognition is crucial to avert a wrongful exclusion of prostate as a primary site. We report five cases of metastatic prostatic neuroendocrine carcinoma diagnosed by image-guided fine-needle aspiration biopsy. The aspirate smears showed loosely cohesive or dyscohesive clusters of tumor cells with scanty (three cases) to moderate amount (two cases) of cytoplasm, speckled or coarse chromatin and inconspicuous nucleoli. Nuclear molding and necrosis were focally present in two cases. Immunohistochemically, the tumor cells were positive for synaptophysin or/and chromogranin, but negative for prostatic specific antigen and prostatic specific acid phosphatase. Review of prior prostate biopsies/resections revealed adenocarcinoma with focal neuroendocrine differentiation in all cases, with two cases being newly recognized on retrospective review. Confirming neuroendocrine differentiation in the prior biopsy/resection may help to establish a link between metastasis and prostate primary. Diagn. Cytopathol. 2008; 36: 545,549. © 2008 Wiley-Liss, Inc. [source]


Follicular dendritic cells confirm lymphoid organization in the minor salivary glands of primary Sjögren's syndrome

JOURNAL OF ORAL PATHOLOGY & MEDICINE, Issue 9 2008
Malin V. Jonsson
Background:, Sjögren's syndrome (SS) is an autoimmune chronic inflammatory disorder affecting the salivary and lacrimal glands. The aim of this study was to explore immunophenotypic features of chronic inflammatory reactions in the minor salivary glands in patients with primary SS (pSS). Methods:, Formalin-fixed, paraffin-embedded labial minor salivary gland tissue sections from randomly selected patients with pSS (n = 60) were investigated for the expression of CD21, CD23, CD35 and IgD by immunohistochemistry. Results:, Based on the distribution and staining pattern of CD21, CD23, CD35 and IgD in lymphoid aggregates, several stages of chronic inflammatory reactions were observed. In 12/60 (20%) patients, lymphoid infiltrates with germinal centre (GC)-like features such as extensive networks of CD21-, CD23- and CD35-positive cells were observed in the minor salivary gland tissue. Smaller networks and,/or focal infiltrates with scattered CD21+, CD23+ and CD35+ cells were observed in the remaining 48/60 (80,%) cases. When dividing patients according to the presence (GC+) or the absence (GC,) of GC in the minor salivary glands, the mean focus score was significantly higher in the GC+ patients (P < 0.05). Double staining of the minor salivary glands revealed focal infiltrates with follicular dentritic cell networks and B cells resembling normal GCs in tonsillar tissue. Conclusion:, A particular cellular profile was demonstrated in a sub-group of patients with pSS and could be linked to serological aberrations. These findings warrant further prospective studies. [source]


Flow cytometric analysis of cell-surface and intracellular antigens in the diagnosis of acute leukemia

AMERICAN JOURNAL OF HEMATOLOGY, Issue 2 2001
Rogelio Paredes-Aguilera
Abstract To evaluate the usefulness of flow cytometric detection of intracellular antigens (Ags) in establishing proper lineage affiliation and its contribution to the diagnosis of acute leukemia, we studied 100 consecutive patients in whom acute leukemia was diagnosed between January 1997 and July 1998. Immunological classification was assessed using a three-line panel of monoclonal antibodies for phenotypic characterization of leukemic blast cells as proposed at the First Latin American Consensus Conference for Flow Cytometric Immunophenotyping of Leukemia. We found 74 cases of B-cell lineage acute lymphoblastic leukemia (ALL), seven cases of T-cell ALL, and 19 cases of acute myeloid leukemia (AML). In this study cytoplasmic (cy) CD79a, cyCD22, cyCD3, and cyMPO were highly sensitive, specific B, T, and myeloid markers that were expressed in virtually all cases of B and T cell ALL and in all subtypes of AML. Applied in combination with immunophenotyping this knowledge led to improvement in diagnostic precision and refinement of immunological classification, ensuring the selection of the most appropriate therapy for the patients studied. In conclusion, intracellular Ags detection was of utmost importance in establishing correct lineage affiliation in cases lacking expression of B, T, or myeloid surface Ags or disclosing equivocal or ambiguous immunophenotypic features and in identifying biphenotypic acute leukemia. In combination with FAB morphology and immunophenotyping, we were able to reliably classify all patients with acute leukemia in this study. Am. J. Hematol. 68:69,74, 2001. © 2001 Wiley-Liss, Inc. [source]


Laryngeal Angiosarcoma: A Clinicopathologic Study of Five Cases With a Review of the Literature,

THE LARYNGOSCOPE, Issue 7 2001
Benjamin M. Loos MD
Abstract Objective Primary laryngeal angiosarcoma (LA) is rare without a reported series evaluating these tumors. Study Design/Methods Five patients with LA were retrospectively retrieved from the Otorhinolaryngic Registry of the Armed Forces Institute of Pathology. Results Three men and 2 women, aged 29 to 71 years, presented with hoarseness (n = 4) and hemoptysis (n = 1). Two patients had previous neck radiation. The tumors involved the supraglottis (n = 4) with a mean size of 3.1 cm. Histologically, all tumors had anastomosing vascular channels lined by remarkably atypical endothelial cells protruding into the lumen, frequent atypical mitotic figures, and hemorrhage. All cases tested (n = 4) demonstrated immunoreactivity with antibodies to Factor VIII-RA and CD34. All patients had surgery followed by postoperative radiation (n = 3 patients). Three patients died with disease (mean, 17 mo), whereas one patient is alive with no evidence of disease at 18 years. Conclusions LA is a rare tumor, frequently associated with previous radiation, usually involving the supraglottis with characteristic histomorphologic and immunophenotypic features. LA has a poor prognosis, making appropriate separation from other conditions important. [source]


Prognostic features of splenic lymphoma with villous lymphocytes: a report on 129 patients

BRITISH JOURNAL OF HAEMATOLOGY, Issue 5 2003
Nilima Parry-Jones
Summary. Splenic lymphoma with villous lymphocytes (SLVL) is a low-grade B-cell lymphoma defined in the World Health Organization classification as the leukaemic form of splenic marginal zone lymphoma. Presenting features and response to therapy have been described, but information on prognostic factors is scanty. Clinical, laboratory and follow-up data were collected on 129 patients with SLVL to determine features predicting disease behaviour and survival. Diagnosis was made on clinical, morphological and immunophenotypic features and, where available, bone marrow and spleen histology. Median age was 69 years (range 39,90 years) and male:female ratio, 0·9. The majority had splenomegaly, but lymphadenopathy and hepatomegaly were rare. Median Hb was 11·8 g/dl, white blood cell count was 16 × 109/l and platelet count was 145 × 109/l; 27% of patients had monoclonal protein in serum and/or urine. While 27% of patients remained untreated, 10% transformed to high-grade lymphoma. Median follow-up was 61 months and median survival was 13 years, with 72% of patients alive at 5 years. Cox regression analysis showed that increasing age, anaemia, thrombocytopenia and lymphocytosis >,16 × 109/l were independent adverse predictors of overall survival. However, only anaemia and lymphocytosis >,16 × 109/l remained highly significant independent prognostic factors when only deaths due to lymphoma were analysed. Splenectomized patients fared better than those receiving chemotherapy only (P = 0·001 for SLVL deaths). We conclude that SLVL is mainly a disease of the elderly with a relatively benign course but, when treatment is required, splenectomy is beneficial. [source]


Co-existent primary cutaneous anaplastic large cell lymphoma and lymphomatoid papulosis

CLINICAL & EXPERIMENTAL DERMATOLOGY, Issue 6 2003
G. Dawn
Summary We describe the case of a 37-year-old female with a history of psoriasiform dermatitis who presented with multicentric primary cutaneous CD30-positive anaplastic large T cell lymphoma (ALCL). Despite aggressive systemic therapy, the patient suffered multiple relapses and the lymphoma spread to cervical and inguinal lymph nodes. Later in her clinical course it was appreciated that she was also suffering from lymphomatoid papulosis (LyP). The case illustrates the overlapping clinical, histological and immunophenotypic features of ALCL and LyP, conditions which represent a spectrum of CD30-positive lymphoproliferative disease. A multidisciplinary approach between dermatologist, oncologist and pathologist is essential for the optimal management of these complex conditions. [source]