Abstract
Background
4-(N-(S-glutathionylacetyl)amino) phenylarsenoxide (GSAO) is a water-soluble mitochondrial toxin that binds to adenine nucleotide translocase in the inner mitochondrial membrane, thereby targeting cell proliferation. This phase 1 study investigated safety, dose-limiting toxicities (DLTs), maximum tolerated dose (MTD) and pharmacokinetics (PK) of GSAO as a daily 1-h infusion for 5 days a week for 2 weeks in every three. Pharmacodynamics of GSAO was evaluated by dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) and circulating markers of angiogenesis.
Methods
Patients with advanced solid tumours received GSAO in a dose-escalation trial according to a standard ‘3 + 3’ design that was guided by toxicity and, for the final dose escalation, by arsenic PK data.
Results
A total of 34 patients were treated with GSAO across 9 dose levels (1.3–44.0 mg/m2). Treatment was well tolerated with few adverse events. An additional three patients were enrolled at the 12.4 mg/m2 dose level following a DLT of derangement of liver function tests (grade 4). At the 44.0 mg/m2 dose level, two out of three patients had DLTs (reversible encephalopathy; paroxysmal atrial fibrillation).
Conclusions
The MTD of GSAO was 22.0 mg/m2/day. There was no biomarker evidence from DCE-MRI or circulating markers of angiogenesis of an anti-vascular effect of GSAO.
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Acknowledgments
This phase I clinical trial was funded, sponsored and managed by the Cancer Research UK Drug Development Office. The following institutions were also involved in this study: Cancer Research UK Formulation Unit, University of Strathclyde; New South Innovations Pty and Oxford NHS Biomedical Research Centre. We thank all of the patients who participated in this trial. The study was supported by CR-UK core funding to the Paterson Institute for Cancer Research (C147/A12328) to C. Dive. The Manchester Experimental Cancer Medicine Centre provides financial support for G. Jayson and J. Cummings. G Jayson also receives financial support from the Manchester Academic Health Centre. Thanks to Dilly Goonetilleke for help with the manuscript.
Conflict of interest
G.J.M. Parker has a shareholding and part time appointment and directorship at Bioxydyn Limited which provides DCE-MRI services.
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Laura Horsley and Jeff Cummings have contributed equally to the manuscript.
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Horsley, L., Cummings, J., Middleton, M. et al. A phase 1 trial of intravenous 4-(N-(S-glutathionylacetyl)amino) phenylarsenoxide (GSAO) in patients with advanced solid tumours. Cancer Chemother Pharmacol 72, 1343–1352 (2013). https://doi.org/10.1007/s00280-013-2320-9
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DOI: https://doi.org/10.1007/s00280-013-2320-9