The Therapeutic Effect of Thalidomide in RI

Inclusion Criteria * Prior irradiation \>/= 12 months prior to study entry. * Radiographic evidence to support the diagnosis of radiation-induced brain injury without tumor recurrence. * Age\>/= 35 years. * Contraindication to glucocorticoids and bevacizumab treatment due to history or high risk of severe adverse effects, or non-effective response to glucocorticoids and bevacizumab treatment in 12 months prior to study entry. * Estimated life expectancy must be greater than 12 months. * Routine laboratory studies: bilirubin \</=1.0 \* upper limits of normal (ULN); aspartate aminotransferase (AST or SGOT) or alanine aminotransferase (ALT)\< 1.0 \* ULN; creatinine \<1.0 \* ULN; white-cell count \>/= 4,000 per cubic millimeter; neutrophils count \>/=1500 per cubic millimeter platelets \>/= 100,000 per cubic millimeter; Hb \>/=110 gram per millilitres; PT, APTT, INR in a normal range. * Ability to understand and willingness to sign a written informed consent document, or constant caregivers who well understand and willingness to sign a written informed consent document. Exclusion Criteria * Evidence of tumor metastasis, recurrence, or invasion; * Current usage of bevacizumab; * Current usage of glucocorticoids; * Evidence of very high intracranial pressure that suggests brain hernia and need surgery; * History of psychiatric diseases before radiotherapy; * History of seizures; * History of arteriosclerotic cardiovascular diseases (ASCVD), e.g. stroke, myocardial infaction, unstable angina, within 6 months; * New York Heart Association Grade II or greater congestive heart failure; * Serious and inadequately controlled cardiac arrhythmia; * Significant vascular disease, e.g. moderate or severe carotid stenosis, aortic aneurysm, history of aortic dissection; * Severe infection; * History of allergy to relevant drugs; * Pregnancy, lactation, or fertility program in the following 12 months; * History or current diagnosis of peripheral nerve disease; * Abnormal in liver and renal function; * Active tuberculosis; * Transplanted organs; * Human immunodeficiency virus; * Participation in other experimental studies.