Abstract
The release of cancer cells from the primary site and penetration into blood vessels are obligatory preliminary steps for metastasis. To investigate the mechanism of such steps we isolated variant cells (designated as Int-3LL) possessing enhanced intravasating ability from Lewis lung carcinoma (3LL) cells by in vivo selection. In spite of the enhanced intravasating ability of Int-3LL, the spontaneous and experimental metastatic abilities of Int-3LL decreased significantly compared to parent cells. Such a cell line has never been reported so far. The matched pair of cell lines described in this report provides a useful system for investigating the primary steps of metastasis.
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