WEE1 and neoplasm: Another miRNA that has been reported as a potential tumour suppressor is miR-497; this is due to its action in targeting the key cell cycle regulator WEE1. Expression of miR-497 in MNA tumours is significantly lower than other tumour types, and high WEE1 levels (low miR-497) are significantly associated with poor overall survival and event free survival in NB (Table 1).