CEACAM5 and neoplasm: Some have also reported the value of serum testosterone, immunoglobulin G 4 (IgG4) and tumor markers carcino-embryonic antigen (CEA), carbohydrate antigen 19-9 (CA19-9) and carbohydrate antigen 242 (CA242) in differentiating between MFCP and PC [5,6,7].