Correlations between the expression of the CD20, MHC class I, and NKG2D ligands ULBP1-3, and rituximab-induced ADCC in B-NHL cell lines. ADCC in the presence of 10μg/mL rituximab against 30 different CD20+ B-NHL cell lines determined by ⁵¹Cr release assays. Y-axis: % lysis. X-axis: MFI ratio of CD20 (upper left panel), MHC class I (upper right panel), ULBP-1 (lower left panel), ULBP-2 (lower middle panel), and ULBP-3 (lower right panel). Each dot plot in each panel represents one cell line. The coefficients and P values assessed by Spearman rank correlation coefficient testing are indicated in each panel.