Development of a novel orthotopic transplantation model of human small cell lung cancer metastasis.

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Because small cell lung cancer (SCLC) is an aggressive cancer with highly metastatic activity, it is important to reveal the molecular basis of the SCLC metastasis for improvement of SCLC therapeutics. In this study, we developed a new in vivo orthotopic model for SCLC metastasis and investigated the molecular mechanism of metastasis using the model. We found that cells used in our model expressed both HGF and its receptor c-MET, and that condition medium of the cells enhanced motility of them. These data suggest the existence of an HGF/MET autocrine loop in our model as in SCLC patients.Moreover, we established a new subclone of the cells with higher metastatitic activity through in vivo selection cycles, and successfully improved our model using this subclone.