CGB5 and neoplasm: According to the 2016 TNM classification of the International Union Against Cancer (UICC) for TGCT, hCG levels in the blood are classified as staging serum tumor markers, as follows: not available or normal value in Sx or S0, less than 5000 mIU/mL in S1, from 5 to 50,000 mIU/mL in S2, and greater than 50,000 mIU/mL in S3.