Comparison of the percentage of CD8⁺ tumor-infiltrating lymphocytes from HLA-DRA^- and HLA-DRA⁺ microarray cases. Diamonds (⋄) indicate the 10 microarray HLA-DRA^- cases, and squares (□) indicate the 12 microarray HLA-DRA⁺ cases. There is a significant difference between the negative and positive cases, 2.9% versus 10.9%, in the median percentage of CD8⁺ cells (P < .001). The median percentages of tumor-infiltrating lymphocytes are shown by long bars. The upper and lower 95% confidence intervals are indicated by short bars.