sentences:  It has been shown that lymphocytes, when exposed to Interleukin 2, are capable of lysing fresh, non-cultured cancer cells, both primary and metastatic.LAK cells respond to these lymphokines, particularly IL-2, by lysing tumor cells that were already known to be resistant to NK cell activity.The mechanism of LAK cells is distinctive from that of natural killer cells because they can lyse cells that NK cells cannot.