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Biomedical subjects

L Fiore-Donati

Publications and source records attributed to L Fiore-Donati.

At least 37 records · Page 2Linked to original sources
PubMed1985

Immunohistochemical demonstration of follicular dendritic cells in bone marrow involvement of B-cell chronic lymphocytic leukemia.

Using a sensitive immunohistochemical technique and a specific monoclonal antibody (RFD-3), follicular dendritic cells (FDC) have been demonstrated in a significant proportion (6/12) of bone marrow samples from patients with nodular marrow involvement of B-cell chronic lymphocytic leukemia (B-CLL). In all cases with "packed marrow" involvement and advanced stages of disease the FDC were absent. As these accessory cells are normally present only in the lymph nodes, their presence in the bone marrow is in accord with the view that B-CLL might be the malignancy of an immature subpopulation of lymph node lymphocytes that invade the bone marrow.

Adult↗
PubMed1985

A distinctive cutaneous malignant neoplasm expressing the Langerhans cell phenotype. Synchronous occurrence with B-chronic lymphocytic leukemia.

The authors describe a 63-year-old woman who developed a histologically distinctive malignant cutaneous neoplasm composed of large pleomorphic cells with abundant cytoplasm and multilobate, often clefted nuclei that occasionally contained small nucleoli. This neoplastic cell population metastasized to a regional lymph node already involved by a B-cell derived chronic lymphocytic leukemia expressing surface IgMk, BA-1, and OKT1. The large metastatic tumor cells lacked surface immunoglobulin, B-lymphocyte associated antigen BA-1, T-lymphocyte associated antigens OKT1 and OKT3, and the monocyte/macrophage markers lysozyme and alpha 1-antichymotrypsin. These tumor cells expressed HLA-DR antigens, adenosine triphosphatase (ATPase), OKT6, and contained S-100 protein, i.e., they expressed the phenotype peculiar to epidermal Langerhans cells. The typical clinical and histologic features of Histiocytosis X were absent. Thus, this case appears to represent a distinctive cutaneous neoplasm composed entirely of malignant cells of dendritic cell origin which, by immunophenotypic and histochemical analysis, appear to be related to epidermal Langerhans cells.

Antibodies, Monoclonal↗
PubMed1984

Immunohistochemical analysis of thymoma. Evidence for medullary origin of epithelial cells.

The histologic organization of lymphoid and nonlymphoid (epithelial and interdigitating) cells in a thymoma has been compared to that of the normal thymus. Enzyme and immunohistochemical methods were applied, using both conventional antisera (to cytokeratin) and monoclonal antibodies (to epithelial cells, HLA-DR and lymphoid subsets). Throughout the tumor, the epithelial cells shared phenotypical similarities with the epithelial cells of thymic medulla (RFD-4 positive, cytokeratin strongly positive, and HLA-DR essentially negative). On the other hand, the lymphoid cells were heterogeneous in phenotype and distribution, and "mimicked" the distribution seen in the normal infant thymus. Immature thymocytes of cortical type (TdT+, OKT6+, OKT3-) were predominant in the areas with moderate lymphocytic infiltration (ML). Mature T-lymphocytes (TdT-, OKT6-, OKT3+) were found mainly in areas with scanty lymphocytes (SL) together with an additional population of HLA-DR positive interdigitating and HLA-DR+, OKT6+ Langerhans'-type cells. These findings indicate that in thymoma tissue, the lymphoid elements of cortical type are apparently surrounded by an inappropriate (medullary) epithelium.

Antibodies, Monoclonal↗
PubMed1984

Immunohistological analysis of bone marrow involvement in lymphoproliferative disorders. The use of cryostat sections from trephine biopsies.

Cryostat sections from frozen samples of human bone marrow trephine biopsies were used for immunohistochemical analysis. Immunoperoxidase and immunofluorescence techniques as well as enzyme histochemistry were applied to these sections in order to characterize bone marrow infiltrates in lymphoproliferative diseases. Various conventional antisera and monoclonal antibodies and several enzymes were able to identify different normal and malignant cell populations. This technology provides a new tool to be used in combination with classical morphology for studying bone marrow involvement during lymphoid malignancies.

Biopsy↗
PubMed1983

[Mortality from malignant tumors in residents of the city of Verona in 1980].

Malignant tumours mortality among residents of the city of Verona (267,703 at 31-12-1980) during the year 1980 is assessed from the ISTAT individual death cards and/or municipal death certificates (especially in the case of deaths outside the municipality). The figures are broken down by site, apparatus or system (in accordance with the VIII-ICD), sex, age at death, and compared with the Italian mortality figures for 1976 (indirectly standardised) and those for the province of Verona for 1976-77 (directly standardised). Tumour mortality per site was generally higher than the Italian level. This is line with the differences noted between geographical areas and the similarity of the rates in more industrialised areas. A salient finding was that lung tumour mortality exceeded that for the province of Varese, which is among the highest in Italy entered on the Register of Tumours. Genital and breast tumours were responsible for the highest number of deaths in women, while stomach cancer was the second cause of death in both sexes. The study will be completed with an analysis of tumour deaths during 1980 and 1981 in the province of Verona as a whole.

Epidemiologic Methods↗
PubMed1983

Routine immunofluorescent and histochemical analysis of bone marrow involvement of lymphoma/leukaemia: the use of cryostat sections.

Enzyme histochemical and immunohistological (immuno-fluorescence and -peroxidase) techniques have been routinely used for investigating over 70 normal and pathological bone marrow samples. This recently standardized diagnostic procedure is very quick and can be performed in a few hours. In 6 cases the clinical diagnosis of leukaemia/lymphoma has become apparent only after the immunohistological analysis of the bone marrow. In 6 other cases the information about the staging of B cell malignancies was superior in the frozen biopsies to the paraffin embedded preparations. Amongst many other features the monoclonality of B CLL/lymphomas, the special features of B CLL infiltrates (RFA-1+, Leu-1+, HLA-DR+, SmIg+), follicular lymphoma deposits (containing follicular dendritic cells) and non-T, non-B acute lymphoblastic leukaemic blasts (terminal transferase+, HLA-DR+) as well as the sometimes conspicuous presence of infiltrating normal T cells could be clearly and reproducibly demonstrated.

Adolescent↗
PubMed1983

Immunohistologic study of bone marrow involvement in B-chronic lymphocytic leukemia.

Bone marrow trephine biopsies from 17 patients with B-chronic lymphocytic leukemia (B-CLL) were studied by immunohistologic techniques in order to investigate the cellular phenotypes of both neoplastic (B-lymphoid) and reactive (T-lymphoid) infiltrates. For this purpose, several heteroantisera and monoclonal antibodies against human Ig isotypes, HLA-DR antigens, and T-cell subpopulations were used in immunofluorescence. The findings were analyzed in relationship to the histologic pattern of involvement, as well as to the immunologic data of cell suspensions from peripheral blood. In all cases, the dominant lymphoid population within the bone marrow infiltrates showed identical phenotypic characteristics of B-CLL cells from the blood (HLA-DR+, mu +, most frequently delta +, kappa +, or lambda +, and weakly RFA-1+). The infiltration by these malignant B cells was diffuse in 5 cases and nodular plus interstitial in 12. The number of T cells (UCHT1+, RFA-1+, mu) was variable (5%-25%) in the different samples, but the values were high when compared to the proportion of T cells in normal bone marrow and in the blood of most patients studied. Furthermore, a clear predominance of T cells exhibiting the inducer phenotype (Leu-3+) was observed in all bone marrow samples, which is in contrast with the findings from peripheral blood, where T cells with the suppressor/cytotoxic phenotype (Leu-2+) were dominant. These data suggest a different blood and tissue distribution of inducer and suppressor/cytotoxic cells in B-CLL, which may have important pathophysiologic significance.

Adult↗
PubMed1983

Bone marrow evaluation: the relative merits of particle sections and smear preparations.

Bone marrow aspirates (311) from patients with various haematologic disorders were examined with both smear preparations and histologic sections. Adequate specimens for comparison were obtained in 77.4%. A wide discrepancy concerning the cellularity was noted between the two methods. The results confirm previous studies and indicate that histologic examination of bone marrow aspirates is particularly helpful in lymphoproliferative disorders. It is concluded that sectioning of aspirated marrow is an important procedure and should be included in the routine examination of bone marrow.

Biopsy, Needle↗
PubMed1982

Dipeptidyl(amino)peptidase IV (DAP-IV) histochemistry on normal and pathologic lymphoid tissues.

The enzyme glycyl-proline-naphthylamidase (dipeptidyl-amino-peptidase IV), (DAP-IV) has been histochemically analysed in normal and pathological specimens of different lymphoid tissues. In all the tissues examined, the enzyme appeared to be highly specific for T cells. Using chloroformacetone fixation and sections of proper thickness, DAP-IV could be successfully demonstrated in cortical thymocytes, which exhibited weak reactivity, as well as in medullary thymocytes which showed a more intense and variable reactivity. A similar reactivity was observed in T cells of peripheral blood, lymph node, and spleen. Various acute lymphoblastic and nonlymphoblastic leukemias and malignant lymphomas were studied using the histochemical method for DAP-IV. Malignant cells from all the acute leukemias and from the B-cell lymphomas were DAP-IV unreactive, while strong reactivity was observed in one case of T-CLL and one case of T-PLL. The possible relationship of DAP-IV positivity pattern with T-cell maturation and its potential use as a diagnostic tool in lymphoproliferative disorders are discussed.

Bone Marrow↗
PubMed1982

Immuno-histological analysis of bone marrow involvement in lymphoproliferative disorders.

Cryostat sections from bone marrow biopsies submerged in gum-sucrose solution and snap-frozen can be stained with various antisera to detect both the membrane and cytoplasmic antigens on normal and malignant populations in their tissue environments. This technique seems to be the method of choice to analyse the degree of BM involvement in cases of non-Hodgkin's lymphoma where conventional histology provides equivocal results. The uniform expression of only one type of light chain in B lymphoma and the analysis of the T cell infiltrate in T-CLL using monoclonal antibodies is demonstrated.

Aged↗
PubMed1982

Enzyme histochemical analysis on cryostat sections of human bone marrow.

A recently developed procedure, that has been shown to be suitable for detailed immunohistological analysis, has been used to prepare cryostat sections of bone marrow to investigate whether enzyme-histochemical techniques are also feasible on such material. A selected group of enzymes, some of which are inhibited or destroyed in paraffin- or plastic-embedded samples, have been demonstrated. The morphological details obtained were satisfactory in the preparations. The enzymes were dipeptidyl(amino)peptidase IV (for T lymphocytes); tartrate-resistant acid phosphatase (for hairy cell leukaemia); acid phosphatase and non-specific esterase (for macrophages and monocytes); ATPase and 5'nucleotidase (for B lymphocytes); and peroxidase or chloroacetate esterase (for granulocytic cells). In these preparations strong enzyme activities were shown. In adjacent sections the immunological analysis of membrane markers could also be performed contributing to a comprehensive study of the normal and malignant bone marrow cells.

Bone Marrow↗
PubMed1981

Enzyme histochemistry on normal and pathologic paraffin-embedded lymphoid tissues.

So far, enzyme histochemical examination has been applied, with few exceptions, either to tissue imprints or to cryostat sections of freshly collected samples. This procedure is not easily applicable in routine histopathologic examination. In this study, a simplified tissue embedding procedure is presented which can be performed using an automatic tissue changer. The paraffin embedded samples can be used for both conventional histopathologic examination and for demonstrating enzymes in sections. The enzymes studied (alkaline phosphatase, alpha-naphthyl acetate esterase, acid phosphatase, tartrate resistant acid phosphatase, ATPase, peroxidase, and chloroacetate esterase) gave comparable results in formalin-fixed cryostat sections and paraffin sections in both normal and pathologic lymphoid samples. The only exception was ATPase, which could not be demonstrated on paraffin-embedded material. The technic described has broad application in the analysis of lymphoid diseases.

Acid Phosphatase↗
PubMed1981

Fluoride resistant alpha-naphthyl acetate esterase and combined enzyme histochemistry in the study of normal and pathologic lymphoid tissues.

Alpha-Naphthyl acetate esterase (ANAE) and fluoride resistant alpha-naphthyl acetate esterase (FRANAE) have been compared as histochemical methods to identify T lymphocytes in sections of normal and pathological human lymphoid tissues. In addition, the FRANAE method was combined with alkaline phosphatase (ALP) in order to simultaneously evaluate the relationship between T lymphocytes and fibroblastic reticular cells (ALP) positive). The "dot like" esterase positivity of T lymphocyte was better evaluated by using FRANAE when compared to ANAE because of fluoride inhibitor of the strong esterase activity of dendritic cells and most macrophages. The combined ALP-FRANAE method clearly demonstrated a large number of fibroblastic reticular cells within the T-areas in various normal and pathological tissues such as hyperplastic lymph nodes and especially in the lymph nodes and spleens from patients with Hodgkin's disease.

Alkaline Phosphatase↗