ARHGAP9 and pancreatic adenocarcinoma: ARHGAP1, ARHGAP7 (DCL1), ARHGAP9, ARHGAP22, ARHGAP31, ARHGAP34 (SRGAP2), and ARHGAP47 (TAGAP) were positively correlated with infiltration of B cells, CD8 + T cells, CD4 + T cells, macrophages, neutrophils, and dendritic cells in PAAD (Fig. 5A).