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F Valensi

Publications and source records attributed to F Valensi.

At least 91 records · Page 5Linked to original sources
PubMed1987

Prognostic significance of chromosomal abnormalities in acute nonlymphocytic leukemia: a study of 343 patients.

Clonal chromosome abnormalities of 343 patients with de novo acute nonlymphocytic leukemia (ANLL) have been tentatively correlated with prognosis. All the patients were treated according to therapeutic protocols in the same hospital. The complete remission rate and median survival were generally lower in AA-ANLL (ANLL with only karyotypically abnormal metaphases) when compared with NN- and AN-ANLL. Similarly, AA-ANLL had the poorest prognosis in the majority of the classes of the French-American-British nomenclature. ANLL with inversion and/or deletion of chromosome #16 had the best prognosis, and ANLL with t(8;21) was not particularly favorable, nor was acute promyelocytic leukemia with t(15;17). ANLL with complex chromosomal abnormalities had the poorest prognosis. The conclusion is that chromosomal aberrations do have a prognostic significance in ANLL, but that this significance is dependent on the types of chromosomal aberrations.

Acute Disease↗
PubMed1987

Peripheral T cell lymphoma following angioimmunoblastic lymphadenopathy.

We report 5 cases of peripheral T cell lymphoma (PTCL) which initially presented as angioimmunoblastic lymphadenopathy (AIL). In 4 cases, the delay between the 2 phases was less than 1 year, and 3 patients were under corticosteroid therapy when the second biopsy was performed. Clinical and biological features were very similar during the 2 phases. The initial disease was morphologically characterized by a high cellular pleomorphism with immunoblasts, plasma cells, eosinophils and lymphoid cells of various size with abundant venules; this pleomorphism then regressed, emphasizing the T cell nature of the lymphoma, as proven by immunological staining with monoclonal antibodies raised against T cell subpopulations. In 4 cases, T cell proliferation bore T helper (CD4) and T cytotoxic/suppressor (CD8) antigens and, in 1 case only, CD4 antigen. The entity of AIL and the role of corticosteroid therapy is discussed; the short interval between the 2 diagnose suggests that T cell proliferation was present initially, but was masked by reactive B lymphocytes.

Adult↗
PubMed1986

Can peripheral T-cell lymphomas be morphologically subclassified? A morphometric approach to 21 cases.

Morphometric analysis of nuclear sizes and shapes was carried out on semithin sections of lymph node for 21 patients suffering from non-Hodgkin's peripheral T-cell malignant lymphoma (ML) (excluding mycosis and Sézary syndrome). Twenty cases of B-cell ML and three cases of Sézary syndrome with massive lymph node infiltration were also studied as references. Wright and Isaacson's recent proposals were applied to classify the peripheral T-cell MLs into monomorphic medium-cell ML (eight cases), pleomorphic ML (nine cases), and monomorphic large-cell ML (four cases). These three classes were readily distinguishable by morphometric analysis of nuclear sizes. Nuclear areas and their coefficients of variation were higher in pleomorphic MLs than in monomorphic medium-cell MLs (p less than 0.01). Large-cell monomorphic MLs were set apart by the histograms of their nuclear sizes. The mitoses were evaluated on histological sections and found to be more numerous in pleomorphic ML than in monomorphic medium-cell ML (p less than 0.05). Nuclear irregularity in the 21 cases of peripheral T-cell ML was lower than in Sézary cells. Morphometry clearly demonstrates the morphological distinctiveness of the subclasses of peripheral T-cell ML. Their biological significance has yet to be determined.

Adult↗
PubMed1986

Immunological typing of acute lymphoblastic leukemia: concurrent analysis by flow cytofluorometry and immunocytology.

For 60 cases of acute lymphoblastic leukemia (ALL) immunological typing was done concurrently by the avidin-biotin-peroxidase method using cytocentrifuged smears and by flow cytofluorometry for the study of surface antigens. The use of a large panel of antibodies detecting differentiation antigens allowed us to sub-classify 57/60 cases as 43 B-lineage ALLs and 14 T-lineage ALLs. The two types of ALL can be accurately distinguished by the expression of the antigens recognized by the antibodies of the clusters of differentiation CD19 (B4) and CD7 (Leu 9). Almost perfect agreement was obtained between the results of the two methods for antigens DR, CD10 (cALLA;J5) and CD7. A number of discordances were observed with other antigens [CD19 (B4), CD20 (B1), CD22 (To15), CD1 (T6), CD2 (T11), CD4 (T4), CD8 (T8), CD3 (T3), T9, T10]. In spite of these discordances, the avidin-biotin-peroxidase method can predict the lineage involved in most ALLs with a high degree of reliability. Nevertheless, for weakly expressed surface antigens (such as B4 and B1) the immunocytological method is less sensitive than flow cytofluorometry and can only approximately determine the stage of differentiation of neoplastic cells. Furthermore, the existence of cases which are at the same time negative with flow cytofluorometry and positive with immunocytology is consistent with the intracytoplasmic expression of certain differentiation antigens. Thus in the course of lymphoid differentiation, intra-cytoplasmic expression of T3, To15 and possibly J5 precedes their expression at the cell surface.

Antigens, Surface↗
PubMed1986

Treatment of hairy cell leukemia with recombinant alpha interferon: II. In vivo down-regulation of alpha interferon receptors on tumor cells.

Interferons (IFNs) initiate their effects by interacting with specific high-affinity cell surface receptors, but little is known about the physiology of IFN receptor interaction in vivo. Treatment of patients suffering from hairy cell leukemia (HCL) with human recombinant alpha IFN results in significant tumor regression, with clinical improvement in a high percentage of cases. To investigate a possible relevance of binding parameters as response markers, IFN receptor interaction on tumor cells responsive to IFN in vivo was studied. Binding of human alpha 2 IFN to circulating hairy cells was analyzed before and during IFN therapy in ten patients selected on the basis of high numbers of peripheral hairy cells. Binding experiments were carried out on Ficoll-Paque fractionated peripheral cell samples containing a majority of hairy cells. All patients reacted to recombinant alpha IFN treatment with a striking decrease in binding capacity within 12 hours after the first injection. As demonstrated by using a monoclonal antibody able to recognize alpha 2 IFN bound to its receptor, this decreased binding capacity was not due to blocking by circulating IFN but rather to a decrease in receptor number. This receptor "down-regulation" was partially reversible after the first IFN injection. However, upon prolonged IFN therapy, all patients displayed a stable state of decreased receptor expression. Down-regulation of IFN receptors can be regarded as a response marker to IFN treatment. This response marker, however, was not correlated with the clinical response within the first months of IFN therapy.

Animals↗
PubMed1985

Two Burkitt's lymphomas with chromosome 6 long arm deletions.

Two new European Burkitt's lymphoma (BL) cases are reported. Their karyotypic abnormalities were unusual, without involvement of chromosomes #8, #14, #2, or #22. However, in both tumors, a 6q- chromosome was, present. These findings raise questions about the definition of BL and the involvement of various different DNA sequences in the mechanisms of BL genesis.

Adult↗
PubMed1985

Characterization of human pericardial macrophages.

This paper deals with the study of the cell population in 13 samples of normal human pericardial fluid. Large mononuclear cells (LMC) constituted 74.1 +/- 18.5% of the total cell population. These LMC possess the characteristics of macrophages firm adherence to glass intracytoplasmic presence of vimentin without keratin, ultrastructural observation of a lysosomal apparatus cytoenzymatic activities: acid phosphatases, naphthol AS.D acetate esterase and peroxidases, and phagocytosis of Baker's yeasts. All these data clearly show that macrophages are the main component of the pericardial fluid cell population and can be of great significance in the defense mechanisms and physiology of the pericardial space.

Adult↗
PubMed1985

Cytogenetic studies on acute myelomonocytic leukaemia (M4) with eosinophilia.

Cytological and cytogenetic studies on 17 acute myelomonocytic leukemia with bone marrow eosinophilia (M4EO) are reported. Cytological criteria include an unusual high proportion of eosinophilic cells containing abnormal granules. Abnormal karyotypes have been found in 12 patients but chromosome 16 abnormalities were present in only 9. In two of them only one such mitosis was detected whereas in 7 others inv(16)(p13q22) and/or del (16)(q22) clones were present. However in 16 cases normal karyotypes were also present. Other abnormal clones coexisted in three patients, suggesting that chromosome 16 abnormalities are not linked to a primary leukemogenic event. M4EO was found to be associated with a favourable prognosis.

Adolescent↗
PubMed1985

Immunologic markers of Burkitt's lymphoma cells.

Lymphocyte markers were studied on fresh cells from 30 patients with Burkitt (L3) leukaemia and cell lines derived from endemic and non-endemic Burkitt's lymphoma (BL) patients. We observed day-to-day variations of lymphocyte marker expression by cultured lines and, occasionally, differences between fresh and cultured cells. In L3 leukaemia, a wide range of phenotypes, including pre-B cell and mature monoclonal IgM + IgD positive B-cell phenotypes, was observed. Most often, the cells expressed high-density monoclonal surface IgM without IgD and lacked IgG Fc, complement and Epstein-Barr virus receptors. Blast cells from rare patients featured monoclonal IgG or IgA instead of IgM. Cases with light chains of the lambda type were more frequent than those with kappa chains. Monoclonal immunoglobulins were found in serum or urine from eight of 20 patients studied. These results are compared with data from the literature on endemic and non-endemic BL and discussed with respect to the maturation stage reached by the cells. In the study of both fresh and cultured cells, we demonstrated a correlation between variant chromosomal translocations and light-chain types, the cells from patients with a t(2;8) translocation expressing kappa and those with a t(8;22) expressing lambda chains, with one exception Vimentin expression was absent or weak in most BLs studied (lines or fresh cells) and in cells from patients with Langer-Giedion syndrome, in contrast to most other lymphomas and leukaemias and normal lymphoblastoid cell lines.

Burkitt Lymphoma↗
PubMed1985

[Value and limitations of puncture guided by x-ray computed tomography in hematology].

Interpretable cytologic data were obtained in 63% of a series of 68 punctures, for biopsy of hematologic affections, guided by CT scanning. The frequency of puncture of post-therapy residual masses (44 cases) explains the high incidence of non-significant examination results after lymph node puncture. The technique was most effective (78% of punctures exploitable) when used for thoracic masses and visceral localizations. The method is very safe: lack of serious incidents and minor reactions, mainly during thoracic puncture, in only 4.4%. The method is simple in use and should be employed, within certain limits that should be recognized, very widely in hematologic diseases.

Abdomen↗
PubMed1984

Malignant lymphomas with band 8q24 chromosome abnormality: a morphologic continuum extending from Burkitt's to immunoblastic lymphoma.

Chromosome abnormality involving band 8q24 is present in the malignant cells in virtually all 'Burkitt's' type malignancies. t(8;14)(q24;q32) translocations have nevertheless been found in certain cases of malignant lymphomas (ML) described as 'small non-cleaved non-Burkitt', 'immunoblastic' or 'histiocytic'. With a view to comparing objectively the histological picture of such lymphomas, we undertook morphometric analysis of seven cases of diffuse ML classed as 'Burkitt's' (three cases), 'immunoblastic' (two cases), 'small non-cleaved non-Burkitt' (one case) and 'large-cell lymphoma' (one case), all exhibiting band 8q24 rearrangement arising from various translocations. Our study substantiates the view that the histologic picture of MLs with 8q24 anomaly fits into a morphological continuum containing 'Burkitt's', 'small non-cleaved non-Burkitt' and 'immunoblastic' lymphomas.

Adult↗
PubMed1983

[Thrombocythemia with Philadelphia chromosome. Secondary appearance of chronic myeloid leukemia].

The finding of a Philadelphia chromosome in a case of apparently primary thrombocythaemia should change the diagnosis for that of chronic myeloid leukaemia. This theoretical view is supported by the case reported here, where a Philadelphia-chromosome was detected in the bone marrow cells of a patient with severe thrombocythaemia; a typical myeloid leukaemia developed 21 months after the onset of the disease; survival was of short duration.

Adult↗
PubMed1983

Cytological types of mitoses and chromosome abnormalities in acute leukemia.

In order to determine the nature of the cells in mitosis in acute leukemia, a parallel study was conducted by cytological and cytogenetic methods on the same marrow and blood samples. On direct marrow examination, erythrocyte precursors in mitosis are usually observed but ordinarily disappear following in vitro culture. In APL (M3) characterized by t(15;17) translocation, the comparison between the proportions of the different categories of cells in mitosis and of karyotypically normal and abnormal cells suggests that erythroblasts do not belong to the leukemic clone. An analogous situation is observed in AML (M2) with t(8;21) and in monocytic leukemia (M5) with chromosome abnormalities. Erythroleukemia could be divided into two categories, one with chromosome abnormalities and persistence of erythroblast mitoses after culture, and another with no detectable chromosome abnormality and with disappearance of erythroblast mitoses following culture. Other examples of blood malignancies demonstrate the importance of the method used in determining which cell categories belong to the leukemic clone. An interpretation of the results in terms of commitment 'level' of the involved stem cells and a distinction between 'primary' and 'secondary' chromosome abnormalities is proposed.

Acute Disease↗