In some cases, laboratory findings may also include increased levels of CYFRA and hyaluronic acid in pleural effusions and ascites fluid, CEA levels within the normal range, and increased levels of inflammatory proteins, as well as thrombocytosis due to the production of interleukin 6 from peritoneal mesotheliomas [8]. This evidence concerns the gene CEACAM5 and peritoneal mesothelioma.