Alkaline phosphatase (ALP) is a ubiquitously expressed dephosphorylating enzyme and its level in blood is widely used as a diagnosis marker of liver damage or bone disorders in human patients. ALP is also considered as an anti-inflammatory protein due to its ability to dephosphorylate and inactivate inflammation-triggering molecules such as lipopolysaccharide (LPS). Placental alkaline phosphatase (ALPP) is one of tissue-specific ALP isozymes expressed mostly during pregnancy, however it was found to be differentially upregulated in certain hepatocellular carcinomas by us recently. In addition, ALPP has been identified as a reliable biomarker of diverse germ cell tumors. Nevertheless, little is known of its immune modulatory role