FBXW7 (F-box and WD40 repeat domain containing 7, also known as FBW7, hCDC4), a tumour suppressor gene, is mutated in many human malignancies.1FBXW7 encodes the substrate recognition component of a Skp, Cullin, F-box-containing (SCF)-E3 ubiquitin ligase complex and negatively regulates multiple proteins with established roles in the control of cell division and growth, including cyclin E, c-Jun, c-Myc, mTor and Notch. Here, JUN is linked to neoplasm.