Inclusion Criteria

DISEASE CHARACTERISTICS:

- Histologically confirmed non-small cell lung cancer

- Stage IIIB or IV disease

- Recurrent disease after prior surgery, chemotherapy, or radiotherapy

- No squamous cell histology or mixed tumor with > 50% squamous cells

- Non-smoker (smoked ≤ 100 cigarettes in lifetime) OR former light smoker (smoked > 100
cigarettes but ≤ 10 pack years AND quit smoking ≥ 1 year ago)

- No known brain metastasis

- Patients with neurological symptoms must undergo a CT scan or MRI of the brain
to exclude brain metastasis

PATIENT CHARACTERISTICS:

- ECOG(Eastern Cooperative Oncology Group)performance status 0-2

- ANC (Absolute Neutrophil Count)≥ 1,500/mm³

- Platelet count ≥ 100,000/mm³

- ALT (Alanine Aminotransferase Test) and AST (Aspartate Aminotransferase Test) ≤ 2.5
times upper limit of normal (ULN)

- Alkaline phosphatase ≤ 2.5 times ULN

- Bilirubin ≤ 1.5 mg/dL

- Creatinine clearance ≥ 50 mL/min

- INR (International Normalized Ratio) < 1.5 OR PT/PTT (Prothrombin time/partial
thromboplastin time)normal

- Not pregnant or nursing

- Negative pregnancy test

- Fertile patients must use effective barrier contraception prior to, during, and for ≥
3 months after completion of study treatment

- No cardiac disease, including any of the following:

- New York Heart Association class III-IV congestive heart failure

- Unstable angina (anginal symptoms at rest)

- New-onset angina within the past 3 months

- Myocardial infarction within the past 6 months

- No cardiac ventricular arrhythmias requiring anti-arrhythmic therapy

- No uncontrolled hypertension (i.e., systolic blood pressure [BP] > 150 mm Hg or
diastolic BP > 90 mm Hg) despite optimal medical management

- No thrombolic or embolic events (e.g., cerebrovascular accident, including transient
ischemic attacks) within the past 6 months

- No pulmonary hemorrhage or bleeding event ≥ CTCAE (Common Terminology Criteria for
Adverse Events)grade 2 within the past 4 weeks

- No other hemorrhage or bleeding event ≥ CTCAE grade 3 within the past 4 weeks

- No active clinically serious infection > CTCAE grade 2

- No serious non-healing wound, ulcer, or bone fracture

- No evidence or history of bleeding diathesis or coagulopathy

- No known HIV infection or chronic hepatitis B or C

- No other malignancy except for any of the following:

- Adequately treated basal cell or squamous cell skin cancer

- In situ cervical cancer

- Other cancer from which the patient has been disease-free for ≥ 5 years with a
low probability of recurrence

- No condition that impairs the patient's ability to swallow whole pills

- No malabsorption problems

- No known or suspected allergy to sorafenib tosylate or any agent given in the course
of this study

- No significant traumatic injury within the past 4 weeks

PRIOR CONCURRENT THERAPY:

- See Disease Characteristics

- No more than one prior systemic chemotherapy treatment for metastatic disease

- Prior treatment with EGFR inhibitors is not considered chemotherapy

- More than 4 weeks since prior major surgery or open biopsy

- No prior sorafenib tosylate

- No concurrent St. John's wort or rifampin

- Concurrent anticoagulation with warfarin or heparin allowed