CCDC6 and testicular germ cell tumor: In order to assess the CCDC6 expression in human testes and testicular germ cell tumors, in the first instance we tested twenty testicular seminomas, including IGCNU, one yolk salk tumor and five embrionary carcinomas and the corresponding normal tissues for CCDC6 expression by immunohistochemistry with an anti-CCDC6 specific monoclonal antibody.