Dataset from A Phase II, Randomized Double-blind, 2-part, Multicenter Study to Compare the Efficacy of ZD6474 With the Efficacy of ZD1839 (Iressa™) in Subjects With Locally Advanced or Metastatic (IIIB/IV) Non-small Cell Lung Cancer After Failure of First-line Platinum-based Chemotherapy and to Assess the Activity of ZD6474 in Subjects Following Failure of Treatment With ZD1839.

The purpose of this study is to compare the efficacy of ZD6474 and ZD1839 in patients with NSCLC after Failure of Prior Platinum-based Chemotherapy.