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Dipeptidyl peptidase 4 (DPP-4) is a transmembrane receptor (also called CD26), found on a variety of cell types and also present in its active form in the plasma. Engagement of CD26/DPP-4 with its ligand, caveolin 1, acts as a costimulatory signal on T cells, and downregulation of CD26 has been associated with reduced acute graft-versus-host disease (aGvHD) without impacting graft-versus-leukemia effect in preclinical mouse studies.
The selective DPP-4 inhibitor, sitagliptin, is approved for the treatment of patients with type II diabetes mellitus. A trial evaluating sitagliptin for the promotion of engraftment following cord-blood transplants remarkably highlighted reduced incidences of aGvHD in patients who received the agent.
Sherif Farag and colleagues carried out a phase II trial to evaluate the safety and efficacy of sitagliptin in combination with tacrolimus and sirolimus for the prevention of aGvHD in patients undergoing myeloablative allogeneic peripheral blood stem cell (PBSC) transplantation. The results were published in the New England Journal of Medicine,1 and the GvHD Hub is happy to provide a summary.
*With a Revised International Prognostic Scoring System score >3.
**Refractory to >2 tyrosine kinase inhibitors or beyond the first chronic phase.
Table 1. Baseline patient characteristics*
ALL, acute lymphoblastic leukemia; AML, acute myeloid leukemia; CML, chronic myeloid leukemia; HCT, hematopoietic cell transplantation; MDS, myelodysplastic syndromes. |
|
Characteristic |
All patients (N = 36) |
---|---|
Median age, years (range) |
46 (20–59) |
Female sex, % |
53 |
Karnofsky performance status score, % |
|
HCT-specific comorbidity index score, % |
|
Disease risk index group, % |
|
Median time from diagnosis to transplantation, days (range) |
138 (41–2,227) |
Donor type, % |
|
Table 2. Grade 3/4 adverse events by Day 30 posttransplant*
*Data from Farag et al.1 |
||
Adverse events, n |
Grade 3 |
Grade 4 |
---|---|---|
Gastrointestinal event |
|
|
Cardiovascular event |
|
|
Renal or urologic event |
|
|
Neurologic event |
|
|
Neutropenic fever |
4 |
0 |
Sepsis |
0 |
3 |
Table 3. Outcomes of patients who received sitagliptin plus sirolimus and tacrolimus as aGvHD prophylaxis prior to matched allogenic PBSC transplantation*
aGvHD, acute GvHD; CI, confidence interval; GvHD, graft-versus-host disease; PBSC, peripheral blood stem cell. |
||
1-year outcomes, % |
All evaluable patients |
95% CI |
---|---|---|
Cumulative incidence |
|
|
Non-relapse mortality |
0 |
— |
GvHD-free, relapse-free survival† |
46 |
29–62 |
Overall survival |
94 |
79–98 |
Data from this phase II trial suggest that GvHD prophylaxis with sitagliptin plus sirolimus and tacrolimus is safe and can strongly reduce aGvHD in patients receiving matched allogeneic PBSC transplantation following myeloablative conditioning. Although data are limited, there is currently no evidence that the addition of sitagliptin has an impact on graft-versus-leukemia effect leading to higher relapse rates. Also, rates of cGvHD, overall survival, and GvHD-free, relapse-free survival compare favorably with other commonly used GvHD prophylaxis regimens, such post-transplant cyclophosphamide, in combination with tacrolimus and mycophenolate.
This study supports the further investigations comparing sitagliptin-based regimens with standard GvHD prophylaxis in randomized trials.
References
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