Lay Summary: Survival rates are high for germ cell tumors (GCTs) due to the effectiveness of platinum-based chemotherapy; however, we don’t know much about how treatment for GCT affects the health of survivors because they have not been included in previous childhood cancer survivor studies. Data from men with testicular GCT and from other childhood cancer survivors suggest that considerable late effects of cancer treatment are likely to exist, including second cancers, hearing loss, heart disease and infertility.