In accordance with other tumour types, height has also been reported as a risk factor for testicular germ cell tumours (TGCTs) (Rasmussen et al., 2003; Richiardi et al., 2003; McGlynn et al., 2007), although there is no direct evidence that circulating IGF1 levels are linked to a higher risk of developing TGCT. The gene discussed is IGF1; the disease is childhood testicular germ cell tumor.