Efficacy and Safety of UC-MSCs for the Treatment of Steroid-resistant aGVHD Following Allo-HSCT

Efficacy and Safety of UC-MSCS for the Treatment of Steroid-resistant aGVHD Following Allo-HSCT: A Multicenter, Randomized, Open-label Trial

Randomized, open-label, multicenter study to investigate the efficacy and safety of umbilical cord-derived mesenchymal stem cells (UC-MSC) for the treatment of steroid-resistant acute graft-versus-host disease (aGVHD) following allogeneic hematopoietic stem cell transplantation (allo-HSCT), with a view to establishing an effective treatment protocol for steroid-resistant aGVHD.

A total of 130 patients with steroid-resistant aGVHD after allo-HSCT are enrolled in this multicenter, randomized, controlled trial. Patients were randomized to UC-MSC + anti-CD25 monoclonal antibodies (mAb) group and anti-CD25 mAb group. The complete response (CR) rate after 4 weeks of treatment in the two groups will be compared. Adverse events are also recorded throughout the study.

Inclusion Criteria:

• 1.Confirmed diagnosed steroid-resistant aGVHD after allo-HSCT. 2. Neutrophile granulocyte (ANC) ≥ 0.5 x 10^9/L. 3. Creatinine below 2 times normal upper limit . 4. Willing and able to sign written informed consent.

Exclusion Criteria:

- 1. Untoleratation of the treatment. 2. Primary disease are not effectively controlled or are progressing. 3. Active infection (Bacteria, fungi, viruses ). 4. Combined with dysfunction of multiple organ. 5. Female patients who are nursing or pregnant, or who contemplate pregnancy during the study period.

6. Patients who are deemed unsuitable for the study by the investigator.