Part 1: To evaluate safety and tolerability of CDP791 given at 10 and 20 mg/kg in combination with carboplatin/paclitaxel in subjects with locally advanced and metastatic (Stage IIIb with malignant pleural effusion or Stage IV) non-squamous non-small-cell lung cancer (NSCLC).Part 2: To compare the tumor response rate of CDP791 given at 10 and 20 mg/kg in combination with carboplatin/paclitaxel with that of carboplatin/paclitaxel alone, in subjects with locally advanced and metastatic (Stage IIIb with malignant pleural effusion or stage IV) non-squamous non-small-cell lung cancer (NSCLC).