MELK and prostate intraepithelial neoplasia: We were able to demonstrate increased levels of MELK protein in PIN lesions, medium‐stage and advanced‐stage tumours in the PB‐Cre/PtenloxP/loxP model, and in PIN, primary tumours and liver metastases in the PB‐Cre/p53loxP/loxPRbloxP/loxP model by immunohistochemistry (IHC) (Fig EV3B–D).