Safety and pharmacokinetic evaluation of repeated intravenous administration of palonosetron 0.75 mg in patients receiving highly or moderately emetogenic chemotherapy

Yosuke Ikari, Kentaro Ogata, Yuta Nakashima, Eiichi Sato, Michio Masaki, Hiroo Katsuya, Toshitaka Goto, Toshihiro Tanaka, Kenji Ishitsuka, Yasushi Takamatsu, Shuuji Hara, Kazuo Tamura
Supportive Care in Cancer 2014, 22 (7): 1959-64

PURPOSE: The aims of this study were to evaluate the safety, efficacy, and pharmacokinetics of repeated doses of palonosetron 0.75 mg on days 1 and 3 in Japanese patients who received highly or moderately emetogenic chemotherapy.

METHODS: Twenty- six patients received palonosetron 0.75 mg intravenously before chemotherapy on days 1 and 3 plus dexamethasone (12-16 mg before chemotherapy on day 1 and 4-8 mg on days 2 and 3). The primary endpoints were safety and pharmacokinetics. Pharmacokinetics were evaluated in a subset of patients (n=6). Complete response and complete protection were evaluated as secondary endpoints.

RESULTS: The accumulation ratios for C max and AUClast after the second dose on day 3 were 1.42 and 1.37, respectively. These values were consistent with the theoretical values expected from the half-life of palonosetron on day 1. Almost all of the patients had no nausea or vomiting in the acute phase (complete response (CR) rate, 96.2% [25/26]; CP rate, 92.3% [24/26]). In the delayed phase (24-192 h post-chemotherapy), the complete response and complete protection rates were 76.9% (20/26) and 61.5% (16/26), respectively. Treatment was well tolerated.

CONCLUSIONS: This is the first study to report the pharmacokinetics of multiple doses of palonosetron 0.75 mg, given on days 1 and 3, in Japanese patients. Repeated treatment with palonosetron was safe and well tolerated by patients who received highly or moderately emetogenic anticancer chemotherapy.

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