Which of the following is not used as a tumour marker in testicular tumours?

Testicular Tumors often secrete polypeptide hormones and ceain enzymes . Biological markers include HCG, AFP, and lactate dehydrogenase, which are valuable in the diagnosis and management of testicular cancer. Elevation of lactate dehydrogenase , provides a tool to assess tumor burden. Marked elevation of serum AFP or HCG levels are produced by yolk sac tumor and choriocarcinoma elements, respectively. CEA ( Carcinoembryonic antigen ) is used as a tumor marker for many cancers like colorectal cancer but not testicular tumors.