n-desmethyltamoxifen has been researched along with desdimethyltamoxifen* in 2 studies
1 trial(s) available for n-desmethyltamoxifen and desdimethyltamoxifen
| Article | Year |
|---|---|
The steady-state pharmacokinetics of tamoxifen and its metabolites in breast cancer patients.
The steady-state pharmacokinetics of tamoxifen and its metabolites was studied in sixteen patients with advanced mammary cancer. Patients were randomized to receive tamoxifen given as Tamofen, Leiras, or as Nolvadex, ICI, 20 mg twice daily for 16 weeks in a cross-over study. Plasma and urine samples were analyzed during one dose interval (12 h) after treatment for 8 and 16 weeks. The concentrations of tamoxifen, N-desmethyltamoxifen, N,N-desdimethyltamoxifen, and metabolite Y were determined in plasma and the areas under the plasma level curves were calculated. 4-Hydroxytamoxifen was not found in plasma. In urine samples only tamoxifen and N-desmethyltamoxifen were above the detection limits even though metabolite Y was also analyzed after acid hydrolysis. There were no statistically significant differences in the concentrations of tamoxifen and its metabolites between the two preparations. The results of nonresponders did not differ from those of responders. Liver metastases had no effect on the metabolism of tamoxifen. Topics: Aged; Breast Neoplasms; Clinical Trials as Topic; Female; Humans; Kinetics; Middle Aged; Neoplasm Metastasis; Random Allocation; Tamoxifen | 1986 |
1 other study(ies) available for n-desmethyltamoxifen and desdimethyltamoxifen
| Article | Year |
|---|---|
Direct determination of tamoxifen and its four major metabolites in plasma using coupled column high-performance liquid chromatography.
A rapid, rugged and fully automated method has been developed for the determination of tamoxifen and its major metabolites in plasma. The system is based upon an in-line extraction process combined with column switching to a coupled analytical column. The plasma sample is deproteinated by the addition of acetonitrile before injection onto a semi-permeable surface (SPS) cyano guard column (1.0 x 0.46 cm I.D.). After washing the guard column briefly with water, the sample is eluted with a mobile phase composed of 35% acetonitrile in 20 mM potassium phosphate buffer (pH 3). The eluent is directed through a cyano analytical column (25 x 0.46 cm I.D.) and a photochemical reactor where the analytes are converted to highly fluorescent phenanthrene derivatives. Tamoxifen, 4-hydroxytamoxifen, N-desdimethyltamoxifen, N-desmethyltamoxifen and tamoxifen-ol are eluted in that order at a flow-rate of 1.0 ml/min. The method has been validated for use in a clinical study utilizing tamoxifen in the treatment of recurrent cerebral astrocytomas. Topics: Adolescent; Adult; Chromatography, High Pressure Liquid; Humans; Sensitivity and Specificity; Tamoxifen | 1994 |