WT1 and testicular germ cell tumor: Haploinsufficiency of WT1 is associated with Wilms tumor, while dysregulated WT1 expression is associated with tumors including leukemia, testicular germ cell tumors and uterine leiomyosarcoma (Coosemans et al., 2011; Boublikova et al., 2016; Cebinelli et al., 2016; Naitoh et al., 2016).