- Clinically suspected all grades acute or chronic GVHD as per Minnesota-Center for International Blood and Marrow Transplant Research (MN-CIBMTR) criteria, that is refractory or intolerant to corticosteroids, occurring after allo-HSCT with any conditioning regimen and any anti-GVHD prophylactic program. Clinical suspicion of GVHD by the treating physician is also sufficient.