MAGESTIC Trial: MiRNA in Detecting Active Germ Cell Tumors in Early Suspected and MetastaTIC Disease Trial

PRIMARY OBJECTIVE: I. To measure the accuracy of the blood-based biomarker miRNA-371 to predict pre-operatively the presence of active germ cell malignancy. OUTLINE: This is an observational study. Patients undergo blood sample collection during screening and throughout the study. Patients whose screening blood samples show elevated miRNA-371 proceed to standard RPLND surgery. Patients whose screening blood samples show normal levels of miRNA-371 undergo standard surveillance followed by standard RPLND surgery at the time of elevated miRNA-371 levels. Patients may also have their medical records reviewed.