Vandetanib is a novel oral molecule (anilinoquinazoline) that has dual activity against both the VEGFR and EGFR pathways. Specifically, this compound has potent and reversible inhibitory activity against VEGFR-2 (KDR), VEGFR-3 (Flt-4), EGFR and RET . Vandetanib is a TKI and thus acts through inhibition of ATP binding to the tyrosine kinase domains of these receptors. Recombinant enzyme assays have demonstrated that vandetanib is highly selective for both VEGFR-2 (IC50=40 nm) with only slightly lower affinity for VEGFR-3 (2.7 fold). EGFR tyrosine kinase activity is inhibited with an IC50=500 nm. The results of a second-line setting phase II trial were presented by Heymach et al at the ASCO meeting in 2006. In this trial, patients were randomized to receive either docetaxel alone, or docetaxel with either 100mg or 300mg of vandetanib. Patients with squamous cell histology, controlled brain metastases and prior history of hemoptysis were allowed on study. The primary endpoint of prolongation of progression-free survival (PFS) was met in the 100mg arm (Hazard Ratio(HR) 0.64, p=0.07). There was no increased incidence of hemoptysis in patients receiving vandetanib, and no CNS hemorrhage events were observed, and side effects commonly attributed to EGFR inhibition (rash, diarrhea) were higher on the 300mg arm. Early combination studies suggest that in patients with NSCLC, vandetanib is safe in combination with chemotherapy, may improve the outcomes of chemotherapy when used at the 100 mg dose, and has activity as monotherapy at the 300mg dose. In addition, none of the observed hemorrhagic complications seen with bevacizumab were observed, even in patients at high risk for this complication.