MUC4 and pancreatic adenocarcinoma: MUC4 expression in PAAD has a weak to moderate positive correlation with the expression of gene marker sets of TAM (HLA-G) (R = 0.174, p = 2.27e-02) and M1 (ROS1) (R = 0.219, p = 3.92e-03) but a negative correlation with M2 (ARG1) (R = −0.159, p = 3.78e-02).