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D Leroux

Publications and source records attributed to D Leroux.

At least 55 records · Page 3Linked to original sources
PubMed1991

t(18;22)(q21;q11) with rearrangement of BCL2 as a possible secondary change in a lymphocytic lymphoma.

We report a lymphocytic lymphoma showing a combination of two characteristic neoplasia-associated chromosomal changes: trisomy 12, commonly observed in chronic lymphocytic leukemia and lymphocytic lymphoma, and t(18;22)(q21;q11), a variant form of the t(14;18)(q32;q21) found in most follicular lymphomas. Southern blot analysis was performed using probes for the 5' end of the BCL2 gene (18q21) and for the J lambda as well as C lambda immunoglobulin genes (22q11). With these two probes, a unique rearranged fragment was detected. Thus the t(18;22)(q21;q11) can be considered as a variant translocation of t(14;18)(q32;q21). The karyotypic analysis supports the assumption that in our case trisomy 12 occurred first, and t(18;22) appeared during tumor progression as part of the clonal evolution. This is at variance with the typical t(14;18), which has never been found to occur as a secondary change.

Blotting, Southern↗
PubMed1991

Non-Hodgkin's lymphomas with t(11;14)(q13;q32): a subset of mantle zone/intermediate lymphocytic lymphoma?

We here describe 13 patients with non-Hodgkin's lymphoma (NHL) and a translocation t(11:14)(q13:q32). They were part of a series of 163 patients with NHL and an abnormal karyotype, serially referred to our institution between January 1984 and 1990. Patients with t(11:14) seem to present several common and interesting features. Males are more frequently affected than females, and old people more than young. They present at diagnosis with advanced disease and usually show involvement of epithelium and bone marrow. With respect to histologic diagnoses, these patients are usually considered to be of low-grade malignancies. However, most of them do very poorly, have short complete remission and frequent relapses whatever the treatment. As a whole, the median survival rate is rather low. The cytologic, histologic as well as the immunologic patterns tend to be uniform: tumours are composed of small cells and display features of mantle zone/intermediate lymphocytic lymphoma. They express high IgM and low IgD levels and more commonly bear Ig lambda light chains. They also express all pan-B antigens (except CD23) as well as the CD5 antigen, but usually lack the CD10. According to these characteristics, these tumours could be placed in between lymphocytic lymphomas (which usually express CD23) and follicular lymphomas (which commonly lack IgD and CD5 and bear CD10 as well as a t(14:18).

Adult↗
PubMed1991

A variant translocation t(2;18) in follicular lymphoma involves the 5' end of bcl-2 and Ig kappa light chain gene.

We have examined three cases of human lymphoma bearing a t(2;18)(p11;q21) chromosome translocation. The bcl-2 gene appeared to be rearranged in all three cases and breakpoints were clustered in the 5' flanking region of the gene. In all three cases, bcl-2 was juxtaposed to J segments of the Ig kappa gene. This juxtaposition of the bcl-2 and Ig kappa genes is very similar to the variant chromosome translocations of Burkitt lymphoma that juxtapose the c-myc locus to IgL genes.

Adult↗
PubMed1990

t(2;18) and t(18;22) variant chromosomal translocations and bcl-2 gene rearrangements in human malignant lymphomas.

Most human follicular lymphomas bear the specific t(14;18) translocation that juxtaposes the 3' region of bcl-2 to the IgH gene on chromosome 14q+. In some rare cases, t(2;18) and t(18;22) translocations have been observed that involve bcl-2 and either Ig kappa or lambda genes. Strikingly, in these cases all the breakpoints on chromosome 18 are located in the 5' end the bcl-2 gene. These rearrangements are very similar to those recently found in a significant proportion of CLL. Thus, bcl-2 rearrangements in malignant lymphomas cluster in at least three regions: the so-called major breakpoint region (mbr) and minor cluster region (mcr) in more than 85% of t(14;18) translocation, and the newly characterized region 5' of the gene. We propose to call this new cluster region vcr (for variant cluster region).

Chromosomes, Human, Pair 14↗
PubMed1990

Translocation t(3;22)(q23;q11) in three patients with diffuse large B cell lymphoma.

In our series of 134 patients with a diagnosis of non-Hodgkin's lymphoma (NHL) and clonal chromosomal abnormalities, three were found to show an identical t(3;22)(q28;q11) translocation. All were old patients with isolated lymphadenomegaly and diffuse large noncleaved cell lymphoma. All expressed a B cell immunophenotype, and all entered a complete remission when treated with aggressive chemotherapy. This translocation could, therefore, delineate a particular subtype of diffuse large cell NHL.

Aged↗
PubMed1989

Establishment and characterization of a granulocytic subclone (UM 384) from the monoblastic cell line U 937.

The human cell line U 937 spontaneously expresses monocytic maturation and can be induced into macrophage-like cells when treated with retinoic acid, sodium butyrate, or 2,3-O-tetra decanoylphorbol-13-acetate. We have selected a subclone, designated UM 384, that expresses granulocytic characteristics and can be induced to mature to granulocytes after exposure to retinoic acid, actinomycin D, and dimethylsulfoxide, and to monocyte-like cells when treated with sodium butyrate and phytohemagglutinin-stimulated leukocyte-conditioned medium. These cells retain the same constitutive markers as the parent line including histocompatibility leukocyte antigens and karyotype but share numerous chromosomal abnormalities, mainly t(X;8) (p21;q12).

Antigens, Differentiation↗
PubMed1988

Translocation (4;11) in a case of malignant lymphoma.

The translocation t(4;11)(q21;q23) is considered a chromosomal marker of acute lymphoid leukemia. We report here a case of a well-differentiated B-cell type non-Hodgkin's lymphoma presenting the same (4;11) translocation.

Adult↗
PubMed1987

Human chronic myeloid leukemic cell line with positive Philadelphia chromosome exhibits megakaryocytic and erythroid characteristics.

A cell line (LAMA-84) has been established from the blood of a patient with chronic myeloid leukemia in acute phase. LAMA-84 cells retained the patient's chromosome abnormalities, i.e., triplication of all chromosomes except chromosome 18, the presence of Philadelphia (Ph) chromosome in 4-5 copies, and the presence of chromosome markers. LAMA-84 cells have morphological features of undifferentiated blast cells, but analyses have indicated that they belong to the megakaryocytic lineage; platelet peroxidase (PPO) was found in 8.5% of cells; LAMA-84 cells reacted spontaneously with poly- and monoclonal antibodies against the platelet glycoproteins (GP) IIb, IIIa, and the GPIIb/IIIa complex, whose presence was confirmed by crossed immunoelectrophoresis. LAMA-84 cells lack the membrane characteristics of lymphoid and mature granulocytic cells but do, however, react with certain antibodies to immature myeloid cells. Furthermore, they are positive with an antiglycophorin antibody, and contain alpha- and gamma-globin mRNA, thus demonstrating erythroid marker expression. Thus LAMA-84 is a tripotent, megakaryocytic, erythroid, and granulocytic cell line. The megakaryocytic and erythroid markers were enhanced by the addition of DMSO, butyrate, TPA, and hemin. The LAMA-84 cell line represents an interesting tool for the study of megakaryocytic and erythroid differentiation and the mechanisms of neoplastic growth.

Adult↗
PubMed1985

Realignment stabilization synovectomy in the rheumatoid wrist. A study of twenty-five cases.

The authors studied a series of 25 rheumatoid wrists, stages II and III according to Steinbrocker or Larsen, treated between 1981 and 1983 by realignment-stabilization synovectomy. The mean follow-up period was 2 1/2 years. The different steps of the operation--articular and tenosynovectomy, tendon transfers associated with dorsal ligamentoplasty--have an additive effect in achieving relief of pain, with preservation of the pre-existing mobility and long-term stability in both the frontal and sagittal planes. In other studies, resection of the ulnar head results in a 40 p. cent increment in instability with notably aggravation of ulnar sliding. Preservation of the distal radioulnar articulation according to Sauve-Kapandji's operation constitutes a new approach to rheumatoid arthritis and, in our opinion, appears to be simple and is very efficient in stabilizing the wrist immediately, thus allowing early rehabilitation of these patients. Long-term stability is affirmed by clinical and roentgenologic follow-up.

Adult↗
PubMed1984

Bloom's syndrome: in vitro correction of the sister chromatid exchange rate by normal cells.

A significant decrease of sister chromatid exchange (SCE) frequencies was observed in Bloom's syndrome(BS) fibroblasts by cocultivation with normal fibroblasts at 5:1, 1:1, 1:5 ratios, and by culture in medium previously used to support normal fibroblasts. On the other hand, the SCE rate of normal fibroblasts was not modified. These results are compared with those from other studies and discussed.

Adult↗
PubMed1984

Monoclonal IgM with anti-muscle tissue activity in a patient with Waldenström's macroglobulinaemia: secretion of identical immunoglobulin by the established lymphoid cell line.

The monoclonal IgM kappa protein from a patient with Waldenström's macroglobulinaemia displayed antibody like activity against muscle and alpha-actinin. An Epstein-Barr virus associated lymphoid cell line, spontaneously established from blood lymphocytes, has been continuously secreting an immunoglobulin of the same isotype, isoelectric focusing spectrotype and reactivity; the cell line is probably leukaemic in origin since all cells display the translocation t (1; 19) and are aneuploid. We suggest these two monoclonal immunoglobulins have a common malignant origin.

Aged↗