The study evaluates safety and efficacy of fecal microbiota transplantation (FMT) for the treatment of refractory graft-versus-host-disease (GVHD) of the gut. FMT might be a beneficial treatment in this clinical situation with a poor prognosis and limited therapeutic options.

Graft-versus-host-disease (GVHD) is a major complication after hematopoietic stem cell transplantation (HSCT). Gut is the most vulnerable target organ of acute GVHD. Patients who have a gastrointestinal acute GVHD received a first-line standard treatment of corticosteroids. For patients who do not respond or progress after an initial response have a high mortality. Therefore, the investigation of effective second line therapy for these patients are in need. The study evaluates safety and efficacy of fecal microbiota transplantation (FMT) for the treatment of refractory GVHD of the gut. FMT might be a beneficial treatment in this clinical situation with a poor prognosis and limited therapeutic options.

Inclusion Criteria:

• 3-18 years of age
• Allo-SCT patients with acute steroid-resistant GI-related GVHD grade III-IV. Steroid-resistant GI-related GVHD will be defined as lack of improvement (same stage) or worsening of GI symptoms after 7 days of steroid therapy (≥ 2 ml/kg of IV methylprednisolone)
• No definite contraindication for gastrointestinal endoscopy
• Signature of informed consent by the legal guardians of patients

Exclusion Criteria:

• Prior inclusion to an interventional study
• Previous Allo-SCT
• Known multi-drug resistance carriage prior to stool collection
• Severe colitis of any etiology or a history of inflammatory bowel disease (IBD)
• Uncontrolled infection (hemodynamic instability, ongoing high fever or bacteremia within 3 days after antibiotics administration)
• Active GI bleeding
• Absolute neutrophil count < 500 cells/microL
• Absolute platelet count< 10 x 109 /L
• Patients who cannot give informed consent