Published in:
01-02-2013 | Short Communication
Phase I evaluation of the effects of ketoconazole and rifampicin on cediranib pharmacokinetics in patients with solid tumours
Authors:
U. Lassen, W. H. Miller, S. Hotte, T. R. J. Evans, C. Kollmansberger, D. Adamson, D. L. Nielsen, J. Spicer, E. Chen, T. Meyer, K. Brown, R. Rafi, M. B. Sawyer
Published in:
Cancer Chemotherapy and Pharmacology
|
Issue 2/2013
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Abstract
Purpose
To investigate any effect of a CYP3A4 inhibitor (ketoconazole) or inducer (rifampicin) on cediranib steady-state pharmacokinetics in patients with advanced solid tumours.
Methods
In two Phase I, open-label trials, patients received once-daily oral doses of cediranib alone [20 mg (ketoconazole study); 45 mg (rifampicin study)] for 7 days followed by cediranib at the same dose with ketoconazole 400 mg/day for 3 days or once-daily rifampicin 600 mg/day for 7 days, respectively. Patients then continued to receive once-daily cediranib.
Results
In the ketoconazole study, 46 patients were dosed; 38 were evaluable for C
ss,max, 36 for AUCss. gMean AUCss and C
ss,max for cediranib 20 mg increased by 21 % (94 % CI 9–35 %) and 26 % (94 % CI 10–43 %), respectively, in the presence of ketoconazole. In the rifampicin study, 64 patients were dosed; 44 were evaluable for C
ss,max and 41 for AUCss. gMean AUCss and C
ss,max for cediranib 45 mg decreased by 39 % (90 % CI 34–43 %) and 23 % (90 % CI 16–30 %), respectively, in the presence of rifampicin. gMean ratios for AUCss and C
ss,max were >1 for ketoconazole and <1 for rifampicin and CIs were outside the pre-specified equivalence boundaries, indicating a statistically significant effect. Significant inter-patient variability in cediranib AUCss and C
ss,max was observed. The safety profile of cediranib was similar to that reported previously.
Conclusions
Co-administration of ketoconazole or rifampicin had statistically significant effects on steady-state pharmacokinetics of cediranib in patients with advanced solid tumours. Therefore, caution is advised when administering cediranib with potent enzyme inhibitors or inducers.