Carboplatin, Pemetrexed Disodium, and Bevacizumab for Patients With Stage III or IV Non-Small Cell Lung Cancer Who Are Light/Never Smokers

DISEASE CHARACTERISTICS: * Histologically confirmed primary lung carcinoma * Non-squamous histology * Advanced disease defined as stage IIIB disease with cytologically documented malignant pleural or pericardial effusion or stage IV disease * Available pathology block or unstained slides from initial or subsequent diagnosis * Must have undergone ≥ 1 core biopsy * No patients whose diagnosis was made through a fine-needle aspirate * No uncontrolled pleural effusions, ascites, or third-space fluid collections * Meets 1 of the following criteria: * Non-smoker, defined as patients who smoked ≤ 100 cigarettes in their lifetime * Former light smoker, defined as patients who smoked between \> 100 cigarettes AND ≤ 10 pack-years AND quit ≥ 1 year ago * No known central nervous system disease, except for treated brain metastases meeting the following criteria: * No evidence of progression or hemorrhage after treatment * No ongoing requirement for dexamethasone as ascertained by clinical examination and brain imaging (MRI or CT scan) during the screening period * Stable doses of anticonvulsants are allowed * Treatment for brain metastases may include whole-brain radiotherapy, radiosurgery (gamma knife, LINAC, or equivalent), or a combination as deemed appropriate by the treating physician * No patients with central nervous system (CNS) metastases treated by neurosurgical resection * No brain biopsy within the past 3 months PATIENT CHARACTERISTICS: * Easter…