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Engraftment of transplanted hematopoietic stem cells (HSCs) is essential for effective long-term hematopoiesis and an important factor influencing the survival of patients undergoing stem cell transplantation.1
During the Transplantation and Cellular Therapy (TCT) 2021 Meetings of ASTCT and CIBMTR, Heather Stefanski and Kevin Goncalves presented results for two products—MGTA-4562 and MGTA-1453—being investigated for rapid and reliable engraftment of transplanted HSCs and improved transplant outcomes. Here, we summarize their findings.
MGTA-456 is a CD34+ cell-expanded umbilical cord blood product designed to provide a high dose of HSCs with improved HLA match. MGTA-456 is being evaluated in a single-arm, open-label, phase II study of patients with high-risk malignancies (NCT03674411).
Table 1. MGTA-456 efficacy*
*Data from Stefanski, et al.2 |
|||
Outcome |
MGTA-456 cohort |
Historic control cohort |
p value |
---|---|---|---|
Neutrophil recovery |
|
|
<0.01 |
Platelet recovery |
|
|
<0.01 |
Incidence of GvHD, % |
|
|
|
Overall survival, % |
72 |
63 |
0.24 |
Non-relapse mortality, % |
12 |
31 |
0.13 |
Median time to first hospital discharge, days |
24 |
33 |
0.01 |
In most cases, HSCs used for transplantation are sourced from mobilized peripheral blood. One of the most used mobilization agents is granulocyte-colony stimulating factor (G-CSF); however, it is hampered by the requirement for daily injections over a ≥5-day duration, variable cell yields, and adverse events. MGTA-145 is a CXCR2 agonist that, when combined with the CXCR4 antagonist, plerixafor, has been shown to induce rapid and robust mobilization of HSCs in animal models.
MGTA-145-101 (NCT03932864) is a four-part, phase I study to assess the safety, tolerability, pharmacokinetics, and pharmacodynamics of MGTA-145 in healthy volunteers, either as a single agent or in combination with plerixafor:
Table 2. Treatment-emergent adverse events for study parts A and B*
TEAE, treatment-emergent adverse event. |
|||
TEAE, % |
Part A |
Part B |
|
---|---|---|---|
MGTA-145, 0.0075–0.3 mg/kg |
Plerixafor + MGTA-145, 0.015–0.15 mg/kg |
Plerixafor |
|
Any drug-related TEAE |
79.2 |
81.6 |
57.1 |
Diarrhea |
— |
15.8 |
35.7 |
Nausea |
— |
18.4 |
14.3 |
Abdominal discomfort/pain |
— |
13.2 |
28.6 |
Vomiting |
— |
7.9 |
7.1 |
Back/musculoskeletal pain† |
79.2 |
63.2 |
14.3 |
Dizziness/lightheadedness |
— |
15.6 |
7.1 |
Headache |
— |
10.5 |
7.1 |
Dysgeusia |
— |
— |
14.3 |
Paresthesia |
— |
5.3 |
— |
Table 3. Single-day mobilization of CD34+ cells*
*Adapted from Goncalves, et al.3 |
|||
Part B: dose escalation |
MGTA-145 (0.015 mg/kg) + plerixafor |
MGTA-145 (0.03 mg/kg) + plerixafor |
Plerixafor |
---|---|---|---|
Median peak CD34+ cells/µL (range) |
35 (17–78) |
40 (18–63) |
26 (13–78) |
>20 CD34+ cells/µL, % |
83 |
83 |
64 |
>40 CD34+ cells/µL, % |
33 |
50 |
21 |
Part D: apheresis |
MGTA-145 (0.015 mg/kg) + plerixafor |
MGTA-145 (0.03 mg/kg) + plerixafor |
— |
Median CD34+ cell yield, ×106 (range) |
35 (17–78) |
40 (18–63) |
— |
Median CD34+ cell dose, ×106/kg (range) |
3.7 (1.5–7.0) |
4.3 (2.7–5.3) |
— |
These results highlight the advances being made to increase the success of HSC engraftment and improve clinical outcomes for patients undergoing HSC transplants.
Enriched for CD34+CD90+ cells, MGTA-456 promotes rapid and sustained hematopoietic recovery, complete engraftment, and improved HLA match in adult patients.
MGTA-145 is a well-tolerated and effective CD34+ cell mobilization agent in combination with plerixafor. The MGTA-145/plerixafor mobilized peripheral blood graft, enriched for HSCs, results in reduced GvHD in a xenotransplant mouse model compared with other graft sources.
References
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