In PAAD, MUC4 expression has significant positive correlations with the immune-infiltrating levels of B cells (R = 0.27, p = 3.6e-04) but no significant correlation with the infiltrating levels of CD8+ T cells, CD4+ T cells, macrophages, neutrophils, and dendritic cells. The gene discussed is MUC4; the disease is pancreatic adenocarcinoma.