HCG and TSH

29 yo M with scrotal mass and signs of hyperthyroidism --> labs show elevated T3/T4 --> biopsy suggests malignancy --> at high concentrations hCG has TSH-like activitiy =======> hCG is structurally similar to TSH and may be observed in high concentrations in patients with testicular tumors. These high levels can stimulate the release of T3/T4