Figure 1From: Enhanced interaction between natural killer cells and lung cancer cells: involvement in gefitinib-mediated immunoregulationGefitinib enhances cytotoxic activity of NK cells to human lung cancer cells. (A-B), Primary human NK cells with high purity were co-cultured with A549 (A) or H1975 tumor cells (B) in the absence and presence of gefitinib for 4 hours. Cytotoxicity was assessed using the 51Cr release assay. Data are expressed as means ± SEM. * p < 0.05 , **p < 0.01.Back to article page