However, only PPF-related pleural effusion has pancreatic-type amylase, while others have salivary-type amylase isoenzyme, which is produced by salivary glands, lung, or tumors.[29]Although there has been no established diagnostic threshold of pleural effusion amylase level for PPF, the amylase level of PPF is grossly elevated, usually above 1000 U/L, which is higher than other pathologies. Here, SGCG is linked to Pleural effusion.