FMT for Steroid Resistant Gut Acute GVHD

Inclusion Criteria: * 1\. Adults(ages are elder than 18 years and younger than 75 years) who developed gut acute Graft-versus-Host Disease(aGVHD) after allogeneic hematopoietic stem cell transplantation(HSCT) and were resistant to a first line therapy with steroids. 2\. patients who were diagnosed as Stage 3 or 4 Gastro-intestinal Acute Graft-versus-Host(GI-aGVHD) with the symptoms such as diarrhea or abdominal pain. 3\. Participants who accepted the FMT treatment. 4. Signature of informed and written consent by the subject. Exclusion Criteria: * 1\. patients who were diagnosed as Stage 1 or 2 Gastro-intestinal Acute Graft-versus-Host(GI-aGVHD) 2. patients with unstable vital signs or severe cardiac and pulmonary disorder. 3. patients who were failure to cooperate endoscopy examination. 4. patients who were younger than 18 years or pregnant. 5. patients who were poor compliance to FMT treatment. 6. patients who were not able to give informed consent.