Consistent with a role as E3 ubiquitin ligase, overexpression of MDM2 accelerated the turnover of FBW7 protein in multiple NSCLC cell lines, along with the stabilization of proteins targeted by FBW7, such as MCL-1, cyclin E and c-Myc (Fig. 4C). Here, MDM2 is linked to non-small cell lung carcinoma.