NK-92 is a continuously growing cell line that has features and characteristics of natural killer (NK) cells that every person has circulating in the blood. Blood NK cells and NK-92 recognize "invaders" such as viruses and fungus. Most importantly, NK-92, like blood NK cells, can attack cancer cells as long as the tumor has not grown out of control. NK-92 cells were isolated and characterized by the laboratory of Dr. H. Klingemann - at that time at the British Columbia Cancer Control Agency in Vancouver, Canada. The cells came from a patient who had a NK cell lymphoma, a rare lymphoma type. Although several other NK cell lines have been cloned, only NK-92 can be expanded to larger numbers and consistently kill tumor cells vigorously. When NK-92 cells bind to a cancer or infected cell, they