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- Title
A phase I study of tasisulam sodium (LY573636 sodium), a novel anticancer compound in patients with refractory solid tumors.
- Authors
Simon GR; Ilaria RL Jr; Sovak MA; Williams CC; Haura EB; Cleverly AL; Sykes AK; Wagner MM; de Alwis DP; Slapak CA; Miller MA; Spriggs DR; Simon, George R; Ilaria, Robert L Jr; Sovak, Mika A; Williams, Charles C; Haura, Eric B; Cleverly, Ann L; Sykes, Amanda K; Wagner, Margaret M
- Abstract
<bold>Purpose: </bold>This phase I study was carried out to determine the phase II recommended dose of tasisulam sodium (hereafter, tasisulam), a novel anticancer agent with a unique mechanism of action.<bold>Methods: </bold>Tasisulam was administered intravenously, every 21 days, in patients with refractory solid tumors using a three-plus-three dose-escalation schema.<bold>Results: </bold>Fifty-three patients were enrolled; the first 34 were treated with a flat dose of tasisulam of up to 2,400 mg, the dose level at which all three patients had dose-limiting toxicity (DLT). Controlling for C(max) proved important to reduce the risk of toxicity; therefore, we initially focused on identifying which parameters explained C(max) (end-of-infusion concentration) variability. Pharmacokinetic analysis indicated that C(max) negatively correlates with lean body weight (LBW). Thus, the dosing regimen was revised using a LBW-based algorithm targeting a specific C(max). A loading/chronic dose paradigm was then implemented as pharmacokinetic results revealed a long terminal half-life of tasisulam, likely because of its high-affinity albumin binding. C(max)-based dose escalation was stopped at the 420-μg/mL cohort, in which one of the 16 patients had DLT (transient hepatic transaminase elevation); grade 3/4 hematologic toxicity was noted in later cycles in three patients. Although response was not a primary objective, 33% of heavily pretreated patients with post-dose radiological assessments had stable disease.<bold>Conclusion: </bold>Implementation of a novel targeted C(max)-based dosing regimen allowed for the recommendation of a phase II tasisulam dose (loading dose of 420 μg/mL targeted C(max) with all subsequent doses administered at 65% of chronic dose given every 21 days) despite pharmacological challenges posed by high albumin binding.
- Publication
Cancer Chemotherapy & Pharmacology, 2011, Vol 68, Issue 5, p1233
- ISSN
0344-5704
- Publication type
journal article
- DOI
10.1007/s00280-011-1593-0