CEACAM5 and neoplasm: Tumor biomarkers (carcinoembryonic antigen (CEA), carbohydrate antigen (CA) 19-9, CA 125, and CA 242) and immunological tests (β2 microglobulin, immunoglobulin G4, interleukin-2, interleukin-4, interleukin-6, interleukin-10, interferon-γ, and lymphocyte subsets) were all within the normal range.