WT1 and Wilms tumor: Although WT1 is firstly identified as tumour suppressor gene in Wilms' tumour, emerging data indicate that WT1 acts as an oncogene and high expression of WT1 is frequently found in different types of cancers including pancreatic cancer,6 lung cancer7 and haematological malignancies.8 As transcript factor, WT1 enhances proliferation, inhibits apoptosis and suppresses differentiation through modulating several important genes, such as Cyclin D19 and Bcl‐2.