An illustration of data elements and the representative variables in the germ cell tumor data model. AFP, alpha fetoprotein; AJCC, American Joint Committee on Cancer; COG, Children’s Oncology Group; FIGO, International Federation of Gynecology and Obstetrics; HCG, human chorionic gonadotrophin; IGCCCG, International Germ Cell Cancer Collaborative Group; LDH, lactate dehydrogenase; MaGIC, Malignant Germ Cell International Consortium; miRNA, microRNA.