the Efficiency of Thalidomide for Recurrent Small Intestinal Bleeding Due to Gastrointestinal Vascular Malformation

Inclusion Criteria: 1. Subjects voluntarily signed the informed consent after the nature and the specific procedures of the trial has been verbally explained; they have the opportunity to ask questions. 2. Chinese nationality; 3. Female or male subjects aged 18-75 years. Female subjects must be menopausal or have undergone sterilization such as tubal ligation and hysterectomy, or have no plan to give birth recently and agree to take contraceptive measures such as contraceptive drugs, intrauterine physical birth control rings or contraception condoms; or men must have undergone sterilization or do not plan to have a child recently and agree to take contraceptive measures such as contraceptive drugs, or contraception condoms. These criteria are set to eliminate the risk of subjects of child bearing potential. 4. The subjects must have been diagnosed, by capsule endoscopy and / or balloon-assisted enteroscopy, with small intestinal vascular malformation lesions which are unsuitable or inaccessible to endoscopic therapy or surgical antrectomy. Subjects with persistent, recurrent bleeding, ≥ 4 episodes of overt or occult bleeding over last year. Exclusion Criteria: 1. Subjects with esophageal varices from cirrhosis of the liver; those with uncontrolled hypertension or hyperglycemia (or diabetics who are being treated with insulin), or those with severe heart (e.g., uncontrolled angina pectoris and / or myocardial infarction, congestive heart failure, etc.), respiratory failure, or renal failure with creatinine (Cr) or blood urea nitrogen (BUN) \> 2 times the upper limit of normal (ULN), pancreatic or hepatic disease with abnormal hepatic function with alanine aminotransferase (ALT), aspartate aminotransferase (AST) or total bilirubin (TBil) \> 2 times ULN 3 months before the enrollment, or those with any other diseases that are not suitable for the study as judged by the Investigator; 2. Subjects with a history of severe peripheral neuropathy or seizures, or a history of thromboembolic disease; 3. Subjects who need to continuously use non-steroidal anti-inflammatory drugs, anticoagulants, antiplatelets, acetylsalicylic acid preparations, or Chinese herbal medicines containing ginkgo and echinacea; or those who need to receive other anti-angiogenic drugs for a long time; 4. Subjects with white blood cell counts persistently \<3.5 \* 10\^9 / L; 5. Subjects with a history of small bowel resection; 6. Subjects known or suspected to be allergic to any component of thalidomide； 7. Subjects with severe gastrointestinal bleeding that is life-threatening and requires immediate surgical treatment; 8. Subjects who have previously received thalidomide for gastrointestinal bleeding 30 days before the enrollment; 9. Alcohol and / or substance abusers with addiction or dependence, or those with poor compliance as judged by a doctor; 10. Subjects who participated in other clinical trial 6 months before enrollment; 11. Subjects without legal capacity or self-awareness.