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9.
Cancer Chemother Pharmacol ; 45(6): 483-8, 2000.
Artigo em Inglês | MEDLINE | ID: mdl-10854136

RESUMO

PURPOSE: Treosulfan (L-threitol-1,4-bis-methanesulfonate, Ovastat) is a prodrug of a bifunctional alkylating agent with activity in ovarian carcinoma and other solid tumors. In a pharmacologic study of the bioavailability of treosulfan in a capsule formulation, patients with relapsed ovarian carcinoma were treated with alternating doses of oral and intravenous (i.v.) treosulfan of 1.5 or 2.0 g daily for 5 to 8 days. METHODS: A sensitive method for the determination of treosulfan in plasma and urine by reversed-phase high-performance liquid chromatography had previously been developed. Pharmacokinetic analyses of treosulfan were carried on plasma and urine samples from 20 i.v. courses and 20 courses of oral administration. RESULTS: The bioavailability ratio (f) of oral to i.v. administration was calculated as 0.97 +/- 0.18 (mean +/- SD) using the values AUC oral = 82.1 +/- 39.4 microg/ml h and AUC i.v. = 85.4 +/- 30.3 microg/ml h. The peak plasma concentration cmax (29 +/- 14 microg/ml vs 65 +/- 23 microg/ml) was significantly (P < 0.01) higher after i.v. administration and the tmax after oral administration was 1.5 +/- 0.34 h. The terminal half-life of treosulfan was about 1.8 h. The mean urinary excretion of the parent compound was about 15% of the administered total dose over 24 h (range 6-26%). CONCLUSIONS: The high and relatively constant bioavailability of treosulfan indicates that capsules provide a satisfactory noninvasive treatment alternative. A feasible and reliable oral treosulfan formulation could provide the basis for the development of long-term low-dose outpatient treatment of patients with malignant diseases.


Assuntos
Antineoplásicos Alquilantes/farmacocinética , Bussulfano/análogos & derivados , Neoplasias Ovarianas/metabolismo , Administração Oral , Idoso , Antineoplásicos Alquilantes/administração & dosagem , Antineoplásicos Alquilantes/uso terapêutico , Disponibilidade Biológica , Bussulfano/administração & dosagem , Bussulfano/farmacocinética , Bussulfano/uso terapêutico , Relação Dose-Resposta a Droga , Avaliação de Medicamentos , Feminino , Humanos , Pessoa de Meia-Idade , Recidiva Local de Neoplasia , Neoplasias Ovarianas/tratamento farmacológico
10.
Cytogenet Cell Genet ; 65(4): 238-42, 1994.
Artigo em Inglês | MEDLINE | ID: mdl-8258297

RESUMO

A cosmid library has been constructed from a hamster x human hybrid cell line and gridded into 270 microtiter plates containing a total of 25,920 single colonies. Approximately 84% of the recombinants contain human material, with an average length of 29 kb. This library represents a nearly three-fold coverage of human chromosome 4. We investigated this library for presumptive genes, using a set of oligonucleotides detecting SpI and splice-site consensus sequences. The presence of simple repeat motifs was investigated in the cosmids using the oligonucleotides (GGATTT)3, (GGAT)4, (CAC)5, (GCC)5, (AGC)5, (GATA)4, (GACA)4, and (CA)8 as hybridization probes.


Assuntos
Cromossomos Humanos Par 4 , Cosmídeos , Biblioteca Gênica , Animais , Sequência de Bases , Clonagem Molecular , Sequência Consenso , Cricetinae , Citometria de Fluxo , Humanos , Células Híbridas , Dados de Sequência Molecular , Splicing de RNA , Sequências Repetitivas de Ácido Nucleico
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