We detected a strong positive association between the expression level of YAP1 and infiltration level of CD8+ T cells, moderate positive associations between YAP1 expression and the infiltration of macrophages, neutrophils, and DCs, and significant positive associations between the infiltration of B cells and YAP1 expression in PAAD, with no relationships between YAP1 and CD4+T cells and tumor purity (Figure 7A). Here, CD4 is linked to pancreatic adenocarcinoma.