Patient description: The patient is a 16-year-old girl recently diagnosed with myasthenia gravis, class IIa. She complains of diplopia and weakness affecting in her upper extremities. She had a positive anti-AChR antibody test, and her single fiber electromyography (SFEMG) was positive. She is on acetylcholinesterase inhibitor treatment combined with immunosuppressants. But she still has some symptoms. She does not smoke or use illicit drugs. She is not sexually active, and her menses are regular. Her physical exam and lab studies are 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,  Metastatic Malignant Neoplasm in the Brain Recurrent Non-Small Cell Lung Carcinoma Stage IIA Non-Small Cell Lung Carcinoma Stage IIB Non-Small Cell Lung Carcinoma Stage IIIA Non-Small Cell Lung Cancer Stage IIIB Non-Small Cell Lung Cancer Stage IV Non-Small Cell Lung Cancer Pathologically proven (either histologic or cytologic) diagnosis of NSCLC with any of the following stages (according to the American Joint Committee on Cancer [AJCC] Staging Manual, 7th edition) Stage IIIA or IIIB Stage II NSCLC with medical contraindication to curative surgical resection Stage IV disease with solitary brain metastasis that has been treated radically (eg: with surgical resection or stereotactic radiosurgery) and thoracic disease that would be classified as stage II-III Appropriate diagnostic/staging workup, including Complete history and physical examination Whole body PET/computed tomography (CT) scan within 42 days prior to study entry demonstrating hypermetabolic pulmonary lesion(s) and/or thoracic lymph node(s), with a maximum standardized uptake volume (SUV) > 6 for at least one lesion; if PET/CT was obtained more than 42 days prior to study entry and is not repeated, CT scan of the chest within 28 days prior to study entry demonstrating stable disease is required Magnetic resonance imaging (MRI) of the brain or CT scan of the head with contrast within 42 days prior to study entry Biopsy confirmation of suspected metastatic disease identified by PET/CT is recommended Pulmonary function tests (PFTs) within 6 weeks of study entry are highly recommended but not required  Pleural or pericardial effusion A patient with pleural effusion may be enrolled the effusion is sampled by thoracentesis and cytology is negative or the effusion is seen on axial imaging but not on chest x-ray and deemed too small to tap under CT or ultrasound guidance Prisoners or subjects who are compulsorily detained (involuntarily incarcerated) for treatment of either a psychiatric or physical (e.g., infectious) illness Women who Are unwilling or unable to use an acceptable method to avoid pregnancy for the entire study period and for at least 4 weeks after cessation of study therapy Have a positive pregnancy test at baseline Are pregnant or breastfeeding Poorly controlled diabetes (defined as fasting glucose level > 200 mg/dL) despite attempts to improve glucose control by fasting duration and adjustment of medications; patients with diabetes will preferably be scheduled for PET/CT imaging in the morning, and instructions for fasting and use of medications will be provided in consultation with the patients' primary physicians