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- W1978367802 abstract "Background. Docetaxel and topotecan are drugs with different mechanisms of action and significant activity against various tumour types. Topotecan may influence docetaxel metabolism by inhibiting the CYP3A4 enzyme. We designed a phase I study to evaluate the maximum tolerated dose of this combination and to assess the impact of pharmaco-kinetic interactions of the two drugs on toxicity. Methods. Docetaxel and topotecan were administered intravenously on day 1, and days 1- 5 respectively, using a phase I dose escalation design. Plasma samples were analysed to determine docetaxel and topotecan concentration by HPLC with subsequent pharmacokinetic analysis using NONMEM. Results. Of the 17 patients enrolled in the trial, 11 had grade 3 and 4 neutropenia and 1 had grade 4 thrombocytopenia. Nonhaematological toxicities were less frequent. The maximum tolerated dose for docetaxel and topotecan were 60 mg/m 2 on day 1 and 0.75 mg/m 2 days 1- 5, respectively. One patient had stable disease. Subjects with grade]3 haematologic toxicity had higher plasma docetaxel or topotecan area under the curve (AUC) (docetaxel 1.0390.11 mg-hr/L versus 0.7390.13 mghr/L; topotecan 65.8914.6 mcg-hr/L versus 41.6913.9 mcg-hr/L). There was no additive effectoftheAUCofthetwodrugsonthe likelihood of grade]3 haematologic toxicity by multiple logistic regression. Conclusion. The dose-limiting toxicity seen with the combination of docetaxel and topotecan was myelosuppression. Future trials will require growth factor support if this combination is pursued." @default.
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- W1978367802 date "2005-12-01" @default.
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- W1978367802 title "Phase I study of docetaxel and topotecan in patients with advanced malignancies" @default.
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- W1978367802 doi "https://doi.org/10.1191/1078155205jp161oa" @default.
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