Overall survival in IPI low/low-intermediate and high-intermediate/high groups. (A) Comparison of overall survival of patients in the lower 10% and upper 90% of HLA-DRA expression for patients with low and low-intermediate IPI scores (0-3), demonstrating a significant difference in survival. (B) Comparison of overall survival of patients in the lower 10% and upper 90% of HLA-DRA expression for patients with high-intermediate and high IPI scores (4-5), demonstrating a significant difference in survival.