In stromal tissues, the densities of CD8+ T cells (p = 0.0008), CD4+ T cells (p = 0.0005), Treg cells (p < 0.0001), CD4+ Teff cells (p = 0.0008), and M2 macrophages (p = 0.0061) were significantly greater in serous carcinoma cases as compared to mucinous carcinoma cases. The gene discussed is CD8A; the disease is serous adenocarcinoma.