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  • Artikel: DFG Deutsche Nationallizenzen  (4)
  • 1H NMR  (2)
  • Elderly  (2)
  • 1
    ISSN: 1432-0584
    Schlagwort(e): Acute myeloid leukemia ; Cytosine arabinoside ; Elderly ; Mitoxantrone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract The majority of patients with acute myeloid leukemia (AML) are elderly, and their response to chemotherapy is poorer than that of younger patients. The combination of mitoxantrone (MTN) and cytosine arabinoside (Ara-C) is a possible alternative to an anthracycline/Ara-C combination for the treatment of AML in these patients. Of 52 older patients (〉 59 years) referred over a 3.5-year period, 33 patients (age range 60–78 years, median 67 years) received MTN and Ara-C as therapy for newly diagnosed AML. MTN was administered at a dose of 12 mg/m2/day, intravenously, for 3 days (23 patients), or 10 mg/m2/day for 5 days (10 patients), and Ara-C at a dose of 100 mg/m2 twice daily, intravenously, for 7 days. Complete remission (CR) was achieved in 16/33 patients (48%). The median remission duration was 6 months (range 1–37 months). The median survival was 14 months for those who achieved CR compared with 9 months for those with resistant disease. Two patients remain in first CR after 13 and 37 months, but three patients died whilst receiving consolidation therapy. In selected elderly patients with AML, the combination of MTN and Ara-C provides an acceptable alternative to an anthracycline/ Ara-C regimen, with a higher CR rate than historical controls. However, the CR rate and remission duration remain low compared with those of younger patients, supporting the need to investigate new approaches to treatment in this population.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-0584
    Schlagwort(e): Key words Acute myeloid leukemia ; Cytosine arabinoside ; Elderly ; Mitoxantrone
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract  The majority of patients with acute myeloid leukemia (AML) are elderly, and their response to chemotherapy is poorer than that of younger patients. The combination of mitoxantrone (MTN) and cytosine arabinoside (Ara-C) is a possible alternative to an anthracycline/Ara-C combination for the treatment of AML in these patients. Of 52 older patients (〉59 years) referred over a 3.5-year period, 33 patients (age range 60–78 years, median 67 years) received MTN and Ara-C as therapy for newly diagnosed AML. MTN was administered at a dose of 12 mg/m2/day, intravenously, for 3 days (23 patients), or 10 mg/m2/day for 5 days (10 patients), and Ara-C at a dose of 100 mg/m2 twice daily, intravenously, for 7 days. Complete remission (CR) was achieved in 16/33 patients (48%). The median remission duration was 6 months (range 1–37 months). The median survival was 14 months for those who achieved CR compared with 9 months for those with resistant disease. Two patients remain in first CR after 13 and 37 months, but three patients died whilst receiving consolidation therapy. In selected elderly patients with AML, the combination of MTN and Ara-C provides an acceptable alternative to an anthracycline/ Ara-C regimen, with a higher CR rate than historical controls. However, the CR rate and remission duration remain low compared with those of younger patients, supporting the need to investigate new approaches to treatment in this population.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    ISSN: 0749-1581
    Schlagwort(e): 1H NMR ; 13C NMR monomethyl/dimethyl 5α-androstan-3-ones ; Steroid ; Ring A conformation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Ring A proton shifts and couplings and 13C shifts of all carbons are given for 17β-acetoxy-2α-methyl- and 17β-methoxy-2β-methyl-5α-androstan-3-one and 2,2-dimethyl-17β-methoxy-5α-androstan-3-one. It was concluded that the 2β-methyl derivative exists with ring A in a regular chair conformation while the 2β-methyl derivative exists with ring A in an inverted boat conformation with C-2 and C-5 at the bow/stern positions. The data for 2,2-dimethyl-17β-methoxy-5α-androstan-3-one suggest an equilibrium of these two conformers.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 0749-1581
    Schlagwort(e): steroids ; 1H NMR ; 13C NMR ; coupling constants ; conformational analysis ; 1D TOCSY ; NOE ; cyclosteroids ; cyclopropanosteroids ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Proton and carbon NMR data are provided for 21 ring A and ring B cyclosteroids and cyclopropano (or methylene) steroids. Shift assignments were made using standard 2D NMR techniques, while ring A proton subspectra were extracted with a 1D TOCSY experiment. Coupling constants were obtained from iterative spin system simulation of these sub-spectra. Ring A conformations were determined from the two- and three-bond proton-proton couplings and NOE measurements. The utility and limitations of extended Karplus-type equations, the effect of cyclopropyl groups on vicinal and geminal couplings and cyclopropane-induced chemical shifts are discussed.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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