Patient description: The patient is a 35-year-old woman with myasthenia gravis, class IIa. She complains of diplopia and fatigue and weakness that affects mainly her upper limbs. She had a positive anti-AChR antibody test, and her single fiber electromyography (SFEMG) was positive. She takes pyridostigmine 60 mg three times a day. But she still has some symptoms that interfere with her job. She is a research coordinator and has 3 children. Her 70-year-old father has hypertension. She does not smoke or use illicit drugs. She drinks alcohol occasionally at social events. Her physical exam and lab studies were not remarkable for any other abnormalities. BP: 110/75 Hgb: 11 g/dl WBC: 8000 /mm3 Plt: 300000 /ml Creatinine: 0.5 mg/dl BUN: 10 mg/dl Beta hcg: negative for pregnancy

Clinical trial eligibility criteria: eligible ages (years): 18.0-999.0,  Non-Small Cell Lung Cancer Brain Metastasis Histological or cytological documented stage IV NSCLC. Sputum cytology alone is excluded 2. Extracerebral lesions show stable disease after first line chemotherapy. Patient has recovered from CTCAE grade 3/4 toxicity. Patients who had never received EGFR-TKI or EGFR monoclonal antibody. 3. Patients must be at least 18 years. 4. ECOG Performance Status 0, 1 or 2. 5. Life expectancy of at least 12 weeks. 6. Appraisable disease, the presence of at least three lesions if longest diameter <10 mm by brain MRI. 7. Haemoglobin ³ 10.0 g/dl, Absolute neutrophil count (ANC) ³1.5 x 109/L, platelets ³ 100 x 109/L. 8. Total bilirubin £ 1.5 x upper limit of normal (ULN) 9. ALT and AST < 2.5 x ULN in the absence of liver metastases, or < 5 x ULN in case of liver metastases. 10. Creatinine clearance ³ 60ml/min (calculated according to Cockcroft-gault formula).11. PT-INR/PTT < 1.2 x ULN. 12. Written informed consent.13. Able to comply with study and follow-up procedures  Mixed small cell and non-small cell lung cancer histology. 2. Any unresolved toxicity>CTCAE grade 2 from previous anti-cancer therapy. 3. Patients with exposure to biotherapy, immunotherapy within 4 weeks of study entry. 4. Other concurrent anticancer therapy. 5. Patients with exposure to investigational drug therapy outside of this trial. 6. Lack of physical integrity of the upper gastrointestinal tract, or malabsorption syndrome, or inability to take oral medication, or have active peptic ulcer disease. 7. Any unstable systemic disease (including active infection, hepatic, renal, metabolic disease or seizure disorder requiring medication). 8. Significant cardiovascular event: congestive heart failure >NYHA class 2; unstable angina, active CAD (myocardial infarction more than 1 year prior to study entry is allowed); serious cardiac arrhythmia requiring anti-arrhythmic therapy ( beta blockers or digoxin are permitted) or uncontrolled hypertension. 9. Brain metastases or spinal cord compression, if treated before the start of study treatment, and have any symptoms. Symptoms signs of increased intracranial pressure ,headache,nausea and vomiting,cognitive or affective disturbances,seizures,and focal neurologic symptoms. 10. History of another malignancy within the last 5 years except cured carcinoma in-situ of uterine cervix, cured basal cell carcinoma of skin and superficial bladder tumors [Ta, Tis & T1]. 11. Pregnant or breast-feeding women. 12. Substance abuse, medical, psychological or social conditions that may interfere with the patient's participation in the study or evaluation of the study results. 13. Any condition that is unstable or could jeopardize the safety of the patient and their compliance in the study