Annals of Oncology Advance Access originally published online on May 19, 2005
Annals of Oncology 2005 16(8):1391-1397; doi:10.1093/annonc/mdi247
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© 2005 European Society for Medical Oncology
Clinical evaluation of ZD6474, an orally active inhibitor of VEGF and EGF receptor signaling, in patients with solid, malignant tumors
1 University of Colorado Cancer Center, Aurora, CO, USA; 2 Cancer Trials Australia, Melbourne, Australia; 3 Astra Zeneca, Boston, MA, USA; 4 Astra Zeneca, Alderley Park, UK; 5 Duke University Medical Centre, Durham, NC, USA
* Correspondence to: Dr H. I. Hurwitz, Duke University Medical Centre, Box 3052, Durham, NC 27710, USA. Tel: +1-919-681-5257; Fax: +1-919-684-9712; Email: hurwi004{at}mc.duke.edu
Background:: ZD6474 selectively inhibits the tyrosine kinase activity of vascular endothelial growth factor receptor and epidermal growth factor receptor. The safety, tolerability and pharmacokinetics of ZD6474 were assessed in a phase I dose-escalation study of patients with advanced solid tumors.
Patients and methods:: Adult patients with tumors refractory to standard treatments received once-daily oral ZD6474 (50600 mg) in 28-day cycles, until disease progression or unacceptable toxicity was observed.
Results:: Seventy-seven patients were treated at doses of 50 mg (n=9), 100 mg (n=19), 200 mg (n=8), 300 mg (n=25), 500 mg (n=8), and 600 mg (n=8). Adverse events were generally mild, and the most common dose-limiting toxicities (DLT) were diarrhea (n=4), hypertension (n=4), and rash (n=3). The incidence of most adverse events appeared to be dose-dependant. In the 500 mg/day cohort, 3/8 patients experienced DLT and this dose was therefore considered to exceed the maximum tolerated dose. Pharmacokinetic analysis confirmed that ZD6474 was suitable for once-daily oral dosing.
Conclusions:: Once-daily oral dosing of ZD6474 at 300 mg/day is generally well tolerated in patients with advanced solid tumors, and this dose is being investigated in phase II trials.
Key words: anti-angiogenesis, dose escalation, pharmacokinetics, tolerability, ZD6474
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