Abstract
Background
4-(N-(S-glutathionylacetyl)amino)phenylarsenoxide (GSAO) is a water-soluble mitochondrial toxin that binds toadenine nucleotide translocase in the inner mitochondrial membrane, therebytargeting cell proliferation. This phase 1 study investigated safety,dose-limiting toxicities (DLTs), maximum tolerated dose (MTD) andpharmacokinetics (PK) of GSAO as a daily 1-h infusion for 5 days a week for 2weeks in every three. Pharmacodynamics of GSAO was evaluated by dynamiccontrast-enhanced magnetic resonance imaging (DCE-MRI) and circulating markersof angiogenesis.
Methods
Patients with advanced solidtumours 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, byarsenic PK data.
Results
A total of 34 patients were treatedwith GSAO across 9 dose levels (1.3-44.0 mg/m2). Treatment was well toleratedwith few adverse events. An additional three patients were enrolled at the 12.4mg/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 22.0mg/m2/day. There was no biomarker evidence from DCE-MRI or circulatingmarkers of angiogenesis of an anti-vascular effect of GSAO.
Original language | English |
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Pages (from-to) | 1343-1352 |
Number of pages | 10 |
Journal | Cancer Chemotherapy and Pharmacology |
Volume | 72 |
Issue number | 6 |
Early online date | 20 Oct 2013 |
DOIs | |
Publication status | Published - 1 Dec 2013 |
Keywords
- adult
- aged
- antineoplastic agents
- arsenicals
- cell proliferation
- dose-response relationship, drug
- female
- glutathione
- humans
- infusions, intravenous
- liver function tests
- magnetic resonance imaging
- male
- maximum tolerated dose
- middle aged
- neoplasms
- neovascularization, pathologic