Moreover, the infiltration of immunosuppressive cells, including regulatory T (Treg) cells, tumor-associated macrophages (TAMs), and myeloid-derived suppressor cells (MDSCs), was reportedly rich, while immunosupportive cells, such as intratumoral CD8+ T cells, were relatively scarce in the PDAC tumor microenvironment [8,9]. The gene discussed is CD8A; the disease is neoplasm.