The results showed that CD56 (bright) cells (r = 0.345, p = 2.7e-6), CD56 (dim) cells (r = 0.287, p < 0.01), neutrophils (r = 0.15, p = 0.045), CD4+ central memory T cells (r = 0.275, p < 0.01), CD8+ central memory T cells (r = 0.207, p = 0.006), CD4+ effective memory T cells (r = −0.178, p = 0.018), and T helper cell 17 (r = 0.37, p = 4.28e-7) were significantly correlated with AQP5 expression in PAAD (Figure 4C). Here, CD4 is linked to pancreatic adenocarcinoma.