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Marked antitumor effect of NK012, a SN-38-incorporating micelle formulation, in a newly developed mouse model of liver metastasis resulting from gastric cancer

    Kazuyoshi Yanagihara

    Division of Translational Research, Exploratory Oncology Research & Clinical Trial Center, National Cancer Center, Kashiwa, Chiba, Japan

    Department of Life Sciences, Yasuda Women’s University Faculty of Pharmacy, Hiroshima, Japan

    ,
    Misato Takigahira

    Investigative Treatment Division, Research Center for Innovative Oncology, National Cancer Center Hospital East, 6–5-1 Kashiwanoha, Kashiwa, Chiba 277–8577, Japan

    ,
    Takanori Kubo

    Department of Life Sciences, Yasuda Women’s University Faculty of Pharmacy, Hiroshima, Japan

    ,
    Takahiro Ochiya

    Division of Molecular & Cellular Medicine, National Cancer Center Research Institute, Tokyo, Japan

    ,
    Tetsuya Hamaguchi

    Gastrointestinal Oncology Division, National Cancer Center Hospital, Tokyo, Japan

    &
    Yasuhiro Matsumura

    * Author for correspondence

    Investigative Treatment Division, Research Center for Innovative Oncology, National Cancer Center Hospital East, 6–5-1 Kashiwanoha, Kashiwa, Chiba 277–8577, Japan.

    Published Online:https://doi.org/10.4155/tde.13.143

    Background: Gastric cancer with liver metastasis (LM) is associated with poor prognosis due to rapid progression. It is, therefore, important to develop a quantitative and highly reproducible animal model of LM using human gastric cancer cells. Methods: Cells of a human gastric cancer cell line, HSC-57, were injected into the portal vein to produce LMs. Cells from some of these metastatic foci were expanded in vitro and subsequently implanted into the portal veins of mice. This procedure was repeated nine times. The antitumor effects of CPT-11 and NK012 were compared using the LM model. Results: The potent metastatic clone 57L9 was obtained. NK012 exerted a stronger antitumor effect than CPT-11 against 57L9 cells integrated with the luciferase gene (57L9Luc). The survival rates on day 131 in the 57L9Luc mouse model were 100% and 0% for the NK012 and CPT-11 groups, respectively. Conclusion: This 57L9Luc LM model was found to be useful for monitoring the responses to NK012 and CPT-11.

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