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  • 1995-1999  (3)
  • 1985-1989
  • AraC and DAC resistance  (1)
  • Non-Hodgkin's lymphoma  (1)
  • prognosis  (1)
Material
Years
  • 1995-1999  (3)
  • 1985-1989
Year
  • 1
    ISSN: 1432-0584
    Keywords: AraC and DAC resistance ; dck gene ; Inactivating mutations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The deoxycytidine kinase (dck) gene encodes the enzyme responsible for the metabolic activation of the antileukemic drugs cytosine arabinoside (AraC) and 5-aza-2′-deoxycytidine (decitabine, DAC). Thedck locus was analyzed at the chromosomal and the molecular level in a model of rat leukemic cell lines, in which AraC and DAC resistance was induced, that was marked bydck deficiency. At the chromosomal level, karyotype analysis of metaphase spreads revealed the presence of an aberrant 2q+ chromosome in the AraC-resistant cell line and a (Xq;11q) translocation in its subclone RA/7. The DAC-resistant lines were identical to the parental RCL/O. Fluorescence in situ hybridization on normal rat fibroblast metaphase spreads localized the ratdck gene to chromosome 14q21-q22, a region that was not involved in any of the observed karyotypic aberrations. Analysis at the molecular level revealed an identical rearrangement of thedck gene in the AraC-resistant cell line RCL/A and its subclone RA/7 that resulted in the absence ofdck expression, as assessed by RT-PCR. No genomic rearrangements were observed in a DAC-resistant cell line RCL/D or in its subclone RD/1. However, detection of a single-stranded conformation polymorphism (SSCP) allowed the identification of a single C to G substitution (His to Gln) in thedck cDNA of the DAC-resistant RD/1 clone. The data demonstrate that exposure to AraC and DAC induces a resistant phenotype marked by functionaldck deficiency that may be the consequence of mutations occurring in thedck gene.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-0584
    Keywords: Key words Cold agglutinin syndrome ; Non-Hodgkin's lymphoma ; Trisomy 3
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Three cases of low-grade B-cell non-Hodgkin's lymphoma associated with cold agglutinin syndrome, cytogenetically characterized by partial trisomy 3, are presented in this report. Our data suggest that the long arm of chromosome 3 might be of particular importance in the pathogenesis of this subgroup of lymphomas.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1569-8041
    Keywords: IPSS ; myelodysplasia ; prognosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Background: In march 1997 an international workshop introduced a new International Prognostic Scoring System (IPSS) for MDS. The goal of the present study was to apply the IPSS to a large group of MDS patients from one centre and to compare it to the FAB-classification. Patients: One hundred eighty-four MDS patients were included on the basis of similar criteria as used by the workshop but some of them (30) received AML-type therapy. Results: The IPSS separated our patients into distinctive prognostic subgroups (P = 0.0001). Median survival was respectively 6.5, 2.6, 1.3 and 0.75 years for the low-risk (22% of patients), the intermediate-1-risk (INT-1) (46%), the intermediate-2-risk (INT-2) (25%) and the high-risk group (7%). The IPSS also discriminated within each of the FAB-categories: RA patients (58 patients) were present in low-risk, INT-1-risk and INT-2-risk subgroups, RARS patients (23) were separated into low-risk and INT-1-risk subgroups. RAEB patients (53) were distributed predominantly between INT-1-risk and INT-2-risk groups, RAEB-t patients (23) between INT-2-risk and high-risk subgroups. CMML patients (27) were present in the low-risk, the INT-1-risk and the INT-2-risk group. Conclusions: Our results confirm the effectiveness of the IPSS in predicting clinical outcome in MDS patients and indicate that it is an improved method compared to the FAB-classification.
    Type of Medium: Electronic Resource
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