alexa A phase I, dose escalation trial of ZD0473, a novel platinum analogue, in combination with gemcitabine.
Pharmaceutical Sciences

Pharmaceutical Sciences

Biochemistry & Pharmacology: Open Access

Author(s): Flaherty KT, Stevenson JP, Redlinger M, Algazy KM, Giatonio B,

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Abstract PURPOSE: To develop a combination regimen for clinical testing, we performed a dose escalation study of ZD0473 in combination with gemcitabine. ZD0473 is a novel platinum analogue with an aliphatic cyclic carrier ligand. In vitro and in vivo studies suggest that it possesses a different spectrum of antitumor activity from cisplatin and carboplatin. In single-agent studies of ZD0473, myelosuppression was the predominant toxicity and responses wer observed. METHODS: In this combination phase I trial, 36 patients with advanced cancer were accrued to four dose levels, with doses of ZD0473 and gemcitabine ranging from 60 to 120 mg/m2 and 600 to 750 mg/m2, respectively ZD0473 was administered on day 1 and gemcitabine was given on days 1 and 8 of a 21-day cycle. RESULTS: Hematologic toxicity was dose-limiting. Grade 3 and 4 thrombocytopenia and neutropenia occurred during 60\% and 41\% of all cycles. Nonhematologic toxicities were mild and reversible. Two partial responses and 19 patients with stable disease were observed. CONCLUSIONS: The recommended phase II doses are 90 mg/m2 of ZD0473 and 750 mg/m2 of gemcitabine for lightly pretreated patients and 600 mg/m2 for heavily pretreated patients. The combination of ZD0473 and gemcitabine is associated with dose-dependent thrombocytopenia and neutropenia as well as having promising clinical activity. This article was published in Cancer Chemother Pharmacol and referenced in Biochemistry & Pharmacology: Open Access

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