MaaT013 As Salvage Therapy in Ruxolitinib Refractory GI-aGVHD Patients

Inclusion Criteria: * Age ≥ 18 years old * Allo-HSCT with any type of donor, stem cell source, GVHD prophylaxis or conditioning regimen. * Acute GvHD episode with GI involvement per MAGIC guidelines (= grades II to IV), with or without involvement of other organs * Patients resistant to steroids AND either resistant to OR with intolerance to ruxolitinib OR with contra-indication to ruxolitinib: Exclusion Criteria: * Patients with known hypersensitivity to vancomycin or to any of the excipients listed in the corresponding SmPC * Patients with active CMV colitis * Patients who had previously received other lines of systemic aGvHD treatment other than CS and ruxolitinib. * Grade II-IV hyper-acute GvHD * Overlap chronic GvHD * Relapsed/persistent malignancy requiring rapid immune suppression withdrawal. * Active uncontrolled infection according to the attending physician * Severe organ dysfunction unrelated to underlying GvHD, including: Cholestatic disorders or unresolved veno-occlusive disease of the liver (defined as persistent bilirubin abnormalities not attributable to GvHD and ongoing organ dysfunction). Clinically significant or uncontrolled cardiac disease including unstable angina, acute myocardial infarction within 6 months before Day 1 of study drug administration, New York Heart Association Class III or IV congestive heart failure, circulatory collapse requiring vasopressor or inotropic support, or arrhythmia that requires therapy. Clinically significant respiratory disease that requires mechanical ventilation support or 50% oxygen. * Current or past veno-occlusive disease or other uncontrolled complication unless otherwise agreed in writing by the sponsor. * Absolute neutrophil count \<500/µL for 3 consecutive days. Use of growth factor supplementation is allowed. * Absolute platelet count \< 10 000/µL. Use of platelet infusion is allowed. * Patient with negative IgG EBV serology. * Current or past evidence of toxic megacolon, bowel obstruction or gastrointestinal perforation. * Any condition that would, in the investigator's judgment, interfere with full participation in the study, including administration of study drug and attending required study visits; pose a significant risk to the subject; or interfere with interpretation of study data. * Known allergy or intolerance to trehalose or maltodextrin. * Vulnerable patients such as: minors, persons deprived of liberty, persons in Intensive Care Unit unable to provide informed consent prior to the intervention. * Females of childbearing potential should have a negative urine or serum pregnancy test within 72 hours prior to receiving the first dose of study medication. Females of childbearing potential should be willing to use 2 methods of birth control or be surgically sterile or abstain from procreative sexual activity for the course of the study. Females of childbearing potential are those who have not been surgically sterilized or have not been free from menses for \>1 year. Males should agree to abstain from procreative sexual activity starting with the first dose of study therapy through the end of the study. * Other ongoing interventional protocol that might interfere with the current study's primary endpoint.