CD8A and neoplasm: Next, to further characterize the role of the different subsets of immune cells with PAAD tumorigenesis, we analyzed the correlation between the expression of hub genes and various immune cell markers, including markers specific for CD8+ T cells, T cells (general), B cells, monocytes, tumor-associated macrophages (TAMs), M1 and M2 macrophages, neutrophils, natural killer cells (NKs) and DCs.