Germ Cell Tumor and Testicular Tumor DNA Registry

Inclusion Criteria: Case Cohort * Must be ≥ 18 years of age AND * Must be an English-speaker AND * Must have a diagnosis or suspicion of germ cell tumor and/or a testicular mass Family Member Cohort * Must be ≥ 18 years of age AND * Must be an English-speaker AND * Must be a blood relative of the proband. Family members of probands are eligible. These individuals need not have a diagnosis of GCT-TT, as they will be used for segregation analysis of suspected variants found in the proband. Control Cohort * Must be ≥ 18 years of age AND * Must be an English-speaker AND * Must not have a personal history of cancer, with the exception of non-melanoma skin cancer, AND * Must not have a family history of germ cell tumor or testicular tumor AND * Must not be a blood relative of controls enrolled in this study Exclusion Criteria: