ACPP is also named as PAP(prostatic acid phosphatase),5'-nucleotidase,thiamine monophosphatas and Belongs to the histidine acid phosphatase family.This enzyme is a homodimeric glycoprotein with a subunit molecular mass of 50 kDa and is an androgen-stimulated secretory product of the human prostate gland.It is also a non-specific phosphatase and has been implicated in the progression of prostate cancer,which inactivates LPA in human seminal plasma. This protein has three glycosylation sites.