GFI1 and medulloblastoma: Growth factor independence 1 (GFI1) and the closely related protein GFI1B are major regulators of both early haematopoiesis and haematopoietic stem cells, and their aberrant activation has been implicated in human medulloblastoma and haematological malignancies (Beauchemin and Möröy, 2020; Ravasio et al., 2020).