This trail is designed to assess the efficacy and safety of high dose Iconitib combined with SRS for NSCLC patients harboring EGFR mutation with brain metastases.

The long-term control of brain metastases becomes a clinical challenge. Whole brain radiotherapy, the standard treatment for patients with multiple brain metastases, can only bring a modest survival improvement around 3-6 months. EGFR-TKIs like icotinib with its proven activity in non-small cell lung cancer may provide clinical benefits to brain metastases patients.

Inclusion Criteria:

• Histological or cytological confirmation of non-small cell lung cancer (NSCLC);
• Diagnosis of brain metastases on a Gadolinium-enhanced MRI.
• Less than 10 sites of intracranial metastases, or the longest diameter of the intracranial lesion is less than 4cm.
• Positive EGFR mutation（Ex19del or 21L858R）.
• Life expectancy ≥3months.
• Have one or more measurable encephalic lesions according to RECIST.
• The patient has not received radiotherapy for the head or extracranial target lesions before.
• Adequate hematological function: Absolute neutrophil count (ANC) ≥1.5 x 109/L, and Platelet count ≥100 x 109/L.
• Adequate renal function: Serum creatinine ≤1.5 x ULN, or ≥ 50 ml/min.
• Adequate liver function: Total bilirubin ≤ 1.5 x upper limit of normal (ULN) and Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST) < 2.5 x ULN in the absence of liver metastases, or < 5 x ULN in case of liver metastases.
• Female subjects should not be pregnant.
• All human subjects should able to comply with the required protocol and follow-up procedures, and able to receive oral medications.
• Written informed consent provided.

Exclusion Criteria:

• Previous usage of EGFR-TKI or antibody to EGFR: gefitinib, erlotinib, herceptin, erbitux.
• CSF or MRI findings consistent with metastases of spinal cord, meninges or meningeal.
• Allergic to Icotinib.
• Lack of physical integrity of the upper gastrointestinal tract, or malabsorption syndrome, or inability to take oral medication, or have active peptic ulcer disease.
• Pregnancy or breast-feeding women.
• Participate in the other anti-tumor clinical trials in 4 weeks.
• have quit from the trail before.
• Any other serious underlying medical, psychological and other condition that, in the judgment of the investigator, may interfere with the planned staging, treatment and follow-up, affect patient compliance or place the patient at high risk from treatment-related complications.