alexa Phase II study of NK105, a paclitaxel-incorporating micellar nanoparticle, for previously treated advanced or recurrent gastric cancer.
Materials Science

Materials Science

Journal of Nanomedicine & Nanotechnology

Author(s): Kato K, Chin K, Yoshikawa T, Yamaguchi K, Tsuji Y,

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Abstract PURPOSE: NK105 is a new drug delivery system formulation for paclitaxel (PTX) whose recommended dose (RD) is 150 mg PTX equivalent/m(2) administered every 3 weeks, as determined in a phase I trial. This study aimed to evaluate the efficacy and safety of NK105 in patients with advanced gastric cancer after failure of first-line chemotherapy. EXPERIMENTAL DESIGN: Eligible patients had measurable disease and one chemotherapeutic regimen except taxane. NK105 (150 mg PTX equivalent/m(2)) was administered by a 30-minute intravenous infusion every 3 weeks without anti-allergic premedication until disease progression, unacceptable toxicity or patient refusal. The primary efficacy endpoint was best overall response rate (ORR) post baseline. The secondary endpoints were progression-free survival (PFS), time to treatment failure (TTF) and overall survival (OS). All adverse events were reported using CTCAE v3.0. RESULTS: Between November 2007 and July 2009, 57 patients were enrolled and 56 were evaluable for efficacy. Two complete responses and 12 partial responses were observed for an ORR of 25\%. The median PFS was 3.0 months, the median TTF was 2.8 months, and the median OS was 14.4 months. Drug related toxicity was mainly mild (grades 1-2) to severe (grades 3-4); other data: neutropenia (64.9\%); leukopenia (17.5\%); lymphopenia (8.8\%); neuropathy-sensory (1.8\%); fatigue (3.5\%); and stomatitis (1.8\%). There were no treatment-related deaths. CONCLUSIONS: This study of NK105 (150 mg PTX equivalent/m(2)) proves the concept for the modest activity and tolerability of a new drug delivery system formulation for PTX. A phase III trial will be evaluated to clarify survival benefit. This article was published in Invest New Drugs and referenced in Journal of Nanomedicine & Nanotechnology

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