In various types of malignant tumours, including leukaemia and cancers of the breast, head and neck, melanoma, prostate, pancreas, and colon, activation of STAT3 is aberrantly increased (Huang, 2007; Al Zaid Siddiquee and Turkson, 2008; Aggarwal et al, 2009). This evidence concerns the gene STAT3 and cancer.