In total tissues, the densities of FAM111B-positive cells (p = 0.0016), CD8+ T cells (p < 0.0001), CD4+ T cells (p = 0.0001), Tregs (p < 0.0001), CD4+ Teff cells (p = 0.0002), M1 macrophages (p = 0.0078), M2 macrophages (p < 0.0001), and DCs (p < 0.0001) were significantly elevated in serous carcinoma as compared to mucinous carcinoma samples. The gene discussed is FAM111B; the disease is mucinous adenocarcinoma.