- Patients with a testicular mass (detected clinically and/or by ultrasound), and/or mediastinal or retroperitoneal lymphadenopathy or pineal tumor AND elevated serum tumor markers (HCG and/or AFP). Patients with elevated LDH only will not be included without pathological confirmation of GCT since LDH is a nonspecific marker for GCT and could potentially be elevated in other malignancies such as lymphomas.