A Randomized Phase 2 Study Comparing Erlotinib-Pemetrexed, Pemetrexed Alone, and Erlotinib Alone, as Second-Line Treatment for Non-Smoker Patients With Locally Advanced or Metastatic Nonsquamous Non-Small Cell Lung Cancer

The purpose of this study is to compare the combination of erlotinib and pemetrexed versus either pemetrexed alone and erlotinib alone, in terms of progression-free survival (time until the objective worsening of the disease) in patients who have never smoked and have locally advanced or metastatic Nonsquamous Non-Small Cell Lung Cancer who have failed a first-line chemotherapy treatment.