WT1 and cancer: The Wilms tumour‐1 (WT1) gene located on human chromosome 11 p13 is firstly isolated and identified in Wilms' tumour, a childhood tumour of the kidney.5 WT1 encodes a 49‐52 kDa protein with four zinc fingers in C‐terminal domain and is important for normal urogenital development and cancer pathogenesis.