Please assess the completion status of the following clinical trial:

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

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
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.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 70 Years
- Healthy Volunteers: f

Study Arms:
- UC-MSC and anti-CD25 mAb (Type: EXPERIMENTAL): UC-MSC, iv, 1×10\^6 cells/kg, once a week, for 4 weeks. Anti-CD25 mAb, iv, 20mg，twice in first week and once a week thereafter, 4 weeks. Other treatment would replace it according to clinical experience if aGVHD continue to progress within 3 weeks of treatment or patients are lack of response after 4 weeks of treatment. The treatment would be repeated in another 4 weeks if patients receive partial response after the first 4 weeks of treatment.
- Anti-CD25 mAb (Type: ACTIVE_COMPARATOR): Anti-CD25 mAb, iv, 20mg，twice in first week and once a week thereafter, for 4 weeks. Other treatment would replace it according to clinical experience if aGVHD continue to progress within 3 weeks of treatment or patients are lack of response after 4 weeks of treatment. The treatment would be repeated in another 4 weeks if patients receive partial response after first 4 weeks of treatment.

Based on this trial design, predict the completion outcome and termination type (if applicable).