natural killer ( nk ) cell function against the nk cell-sensitive myeloid leukemia cell line , k562 , was measured in the peripheral blood mononuclear cells ( pbmcs ) of 17 patients with primary brain tumors ( 4 diagnosed as having low grade tumors and 13 diagnosed as having high grade ( malignant ) tumors ) .
C0027651
tumors
C0006826
malignant