BRD2 and Wilms tumor: Haematological (n=151), solid (n=73). Prepubertal (n=162), pubertal (n=82)Inhibin B: pretreatment normal in nephroblastoma, normal/ low in all other solid and haematological malignanciesTestosterone, FSH and LH: pretreatment normal in prepubertal and pubertal