Post Transplant
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2021 ◽  
Vol 66 (4) ◽  
pp. 539-555
Author(s):  
Z. V. Konova ◽  
E. N. Parovichnikova ◽  
I. V. Galtseva ◽  
M. Yu. Drokov ◽  
Yu. O. Davydova ◽  
...  

Introduction. One of the main causes of treatment failure after allogeneic hematopoietic stem cells transplantation (alloHSCT) for acute leukemia (AL) is disease relapse. In recent years, multiparameter fl ow cytometry (MPC) has been widely used to detect minimal residual disease (MRD) because of its capacity to identify patients with a high risk of relapse due to availability and the ability to obtain results in a timely manner.Aim — to evaluate the prognostic value of MRD status before allo-HSCT and the effect of donor type and conditioning intensity on long-term results of allo-HSCT of MOB-positive patients.Patients and methods. The analysis included 107 patients with acute myeloid leukemia (AML) and 63 patients with acute lymphoblastic leukemia (ALL) who underwent allo-HSCT between September 2015 and June 2020. All patients were in complete morphological remission before allo-HSCT. At the time of allo-HSCT 91 patients with AML and 37 patients with ALL were in the first complete remission (CR), in their second and more than two CRs were 16 and 26 patients, respectively. The median follow-up was 18 (1.5–48) months for AML and 14 (1.8–60.1) months for ALL. Immunophenotypic study was performed before allo-HSCT. MRD was detected using a combination of the “different from normal” method and the search for cells with a leukemia-associated immunophenotype.Results. The disease status at the time of transplantation and the presence of MRD before allo-HSCT were independent factors infl uencing the probability of relapse (disease status: HR = 2.911, 95% CI: 1.328–6.379; MRD before allo-HSCT: HR = 7.667, 95% CI: 3.606–16.304) and post-transplant mortality (disease status: HR = 2.911, 95% CI: 1.328–6.379; MRD before allo-HSCT: HR = 7.667, 95% CI: 3.606–16.304). In univariate analysis, the relapse-free survival of MRD+ patients with AL in the first CR was significantly worse than in MRD– (AML: 23 % versus 57 %, p < 0.0001, ALL: 34 % versus 61.7 %, p = 0.0484), and the probability of relapse in MRD+ patients was significantly higher (AML: 75 % versus 12 %, p < 0.0001, ALL: 57 % versus 7 %, p = 0.0072). Pre-transplant MRD status was not prognostically significant for AL-patients in the second and third remission. The development of chronic GVHD reduces post-transplant mortality if it does not require systemic therapy with glucocorticosteroids (HR = 0.006, 95% CI: 0.008–0.446).Conclusion. Testing for MRD of patients with AL in the first CR before allo-HSCT is necessary for risk stratification and identification of patients who will need preventive post-transplant therapy in order to prevent disease relapse.


2021 ◽  
Vol 66 (4) ◽  
pp. 499-511
Author(s):  
E. V. Batorov ◽  
V. V. Sergeevicheva ◽  
T. A. Aristova ◽  
S. A. Sizikova ◽  
G. Y. Ushakova ◽  
...  

Introduction. High-dose chemotherapy (HDC) with autologous hematopoietic stem cell transplantation (auto-HSCT) is the standard of treatment for multiple myeloma (MM) patients. The post-transplant period appears to be promising for targeted anti-checkpoint therapy in MM.Aim — to study the dynamics and functional properties of T-cells expressing inhibitory checkpoint molecules PD-1 and TIM-3 in patients with MM under conditions of lymphopenia after HDC with auto-HSCT.Methods. The study included 40 patients with MM who underwent HDC with auto-HSCT. The counts of PD-1- and TIM3-positive CD8+ and CD4+ T-cells and their functional activity on the intracellular expression of Ki-67, production of granzyme B, and interferon-γ were assessed by fl ow cytometry.Results. Relative counts of patient PD-1+ and TIM-3+ subsets of CD8+ and CD4+ T-cells obtained from bone marrow samples were higher compared to peripheral blood. CD8+ PD-1+ and CD4+ PD-1+ T-cells of MM patients had a pronounced cytotoxic and cytokine-producing potential. The functional activity of CD8+ TIM-3+ and CD4+ TIM-3+ T-cells was signifi cantly reduced compared with TIM-3-negative subsets. Low functional activity was also detected in populations of CD8+ and CD4+ T-lympho cytes, co-expressing PD-1 and TIM-3. The frequencies of T-cells expressing PD-1 and TIM-3 increased signifi cantly on the engraftment day after auto-HSCT. The proliferative activity of PD-1+ and TIM-3+ CD4+ and CD8+ T-cells and the cytotoxic potential of PD-1+ and TIM-3+ CD8+ T-cells were also signifi cantly increased compared to the data prior auto-HSCT.Conclusions. PD-1-positive T-cells in MM patients are related to activated or “early dysfunctional” but not exhausted subsets, while T-cells exhaustion is more analogous with CD8+ TIM-3+ and CD4+ TIM-3+ T-cells, as well as with subsets co-expressing PD-1 and TIM-3. To identify the state of T-cells exhaustion, it is necessary to evaluate T-cells subsets co-expressing PD-1, TIM-3, and other ICMs, and/or to study their functional properties. In the early post-transplant period, the proportion of Tcells expressing PD-1 and TIM-3 increases due to an increase in their proliferative potential.


2021 ◽  
Vol 12 ◽  
Author(s):  
Deepali K. Bhat ◽  
Purevdorj B. Olkhanud ◽  
Arunakumar Gangaplara ◽  
Fayaz Seifuddin ◽  
Mehdi Pirooznia ◽  
...  

Haploidentical hematopoietic stem cell transplantation (haplo-HSCT) is a widely available curative option for patients with sickle cell disease (SCD). Our original non-myeloablative haplo-HSCT trial employing post-transplant (PT) cyclophosphamide had a low incidence of GVHD but had high rejection rates. Here, we aimed to evaluate immune reconstitution following haplo-HSCT and identify cytokines and cells associated with graft rejection/engraftment. 50 cytokines and 10 immune cell subsets were screened using multiplex-ELISA and flow cytometry, respectively, at baseline and PT-Days 30, 60, 100, and 180. We observed the most significant differences in cytokine levels between the engrafted and rejected groups at PT-Day 60, corresponding with clinical findings of secondary graft rejection. Of the 44 cytokines evaluated, plasma concentrations of 19 cytokines were different between the two groups at PT-Day 60. Factor analysis suggested two independent factors. The first factor (IL-17A, IL-10, IL-7, G-CSF, IL-2, MIP-1a, VEGF, and TGFb1 contributed significantly) was strongly associated with engraftment with OR = 2.7 (95%CI of 1.4 to 5.4), whereas the second factor (GROa and IL-18 contributed significantly) was not significantly associated with engraftment. Sufficient donor myeloid chimerism (DMC) is critical for the success of HSCT; here, we evaluated immune cells among high (H) DMC (DMC≥20%) and low (L) DMC (DMC&lt;20%) groups along with engrafted and rejected groups. We found that early myeloid-derived suppressor cell (eMDSC) frequencies were elevated in engrafted patients and patients with HDMC at PT-Day 30 (P&lt; 0.04 &amp; P&lt; 0.003, respectively). 9 of 20 patients were evaluated for the source of eMDSCs. The HDMC group had high mixed chimeric eMDSCs as compared to the LDMC group (P&lt; 0.00001). We found a positive correlation between the frequencies of eMDSCs and Tregs at PT-Day 100 (r=0.72, P &lt;0.0007); eMDSCs at BSL and Tregs at PT-Day 100 (r=0.63, P &lt;0.004). Of 10 immune regulatory cells and 50 cytokines, we observed mixed chimeric eMDSCs and IL-17A, IL-10, IL-7, G-CSF, IL-2, MIP-1a, VEGF, TGFb1 as potential hits which could serve as prognostic markers in predicting allograft outcome towards engraftment following haploidentical HSCT employing post-transplant cyclophosphamide. The current findings need to be replicated and further explored in a larger cohort.


2021 ◽  
Author(s):  
Vedat Uygun ◽  
Gülsün Karasu ◽  
Koray Yalçın ◽  
Seda Ozturkmen ◽  
Hayriye Daloğlu ◽  
...  

Background: The use of unmanipulated haploidentical stem cell transplantations (haplo-HSCT) with post-transplant cyclophosphamide (PTCY) in children has emerged as an acceptable alternative to the patients without a matched donor. However, the timing of calcineurin inhibitors (CNI) used in combination with PTCY is increasingly becoming a topic of controversy. Method: We evaluated 49 children with acute leukemia who underwent unmanipulated haplo-HSCT with PTCY according to the initiation day of CNIs (pre- or post-CY). Results: There were no significant differences in the overall survival analysis between the two groups. The cumulative incidence of relapse at 2 years was 21.2% in the pre-CY group and 38.9% in the post-CY group (p=0.33). Cytokine release syndrome (CRS) was observed more frequently in the post-CY group (p=0.04). The OS and EFS at 2 years in patients with and without CRS in the pre-Cy group were 42.9% vs 87.5% (p=0.04) and 38.1% vs 87.5% (p=0.04), respectively. Conclusion: Our study shows that the argument for starting CNI administration after CY is tenuous, and the rationale for not starting CNI before CY needs to be reconsidered.


2021 ◽  
Vol 12 ◽  
Author(s):  
Lekshmy Srinivas ◽  
Noble Gracious ◽  
Radhakrishnan R. Nair

Tacrolimus, an immunosuppressant used in solid organ transplantation, has a narrow therapeutic index and exhibits inter-individual pharmacokinetic variability. Achieving and maintaining a therapeutic level of the drug by giving appropriate doses is crucial for successful immunosuppression, especially during the initial post-transplant period. We studied the effect of CYP3A5, CYP3A4, and ABCB1 gene polymorphisms on tacrolimus trough concentrations in South Indian renal transplant recipients from Kerala to formulate a genotype-based dosing equation to calculate the required starting daily dose of tacrolimus to be given to each patient to attain optimal initial post-transplant period drug level. We also investigated the effect of these genes on drug-induced adverse effects and rejection episodes and looked into the global distribution of allele frequencies of these polymorphisms. One hundred forty-five renal transplant recipients on a triple immunosuppressive regimen of tacrolimus, mycophenolate mofetil, and steroid were included in this study. Clinical data including tacrolimus daily doses, trough levels (C0) and dose-adjusted tacrolimus trough concentration (C0/D) in blood at three time points (day 6, 6 months, and 1-year post-transplantation), adverse drug effects, rejection episodes, serum creatinine levels, etc., were recorded. The patients were genotyped for CYP3A5*3, CYP3A4*1B, CYP3A4*1G, ABCB1 G2677T, and ABCB1 C3435T polymorphisms by the PCR-RFLP method. We found that CYP3A5*3 polymorphism was the single most strongly associated factor determining the tacrolimus C0/D in blood at all three time points (p &lt; 0.001). Using multiple linear regression, we formulated a simple and easy to compute equation that will help the clinician calculate the starting tacrolimus dose per kg body weight to be administered to a patient to attain optimal initial post-transplant period tacrolimus level. CYP3A5 expressors had an increased chance of rejection than non-expressors (p = 0.028), while non-expressors had an increased risk for new-onset diabetes mellitus after transplantation (NODAT) than expressors (p = 0.018). Genotype-guided initial tacrolimus dosing would help transplant recipients achieve optimal initial post-transplant period tacrolimus levels and thus prevent the adverse effects due to overdose and rejection due to inadequate dose. We observed inter-population differences in allele frequencies of drug metabolizer and transporter genes, emphasizing the importance of formulating population-specific dose prediction models to draw results of clinical relevance.


Author(s):  
Jaqueline de Jesus Pereira ◽  
Renata Nishiyama Ikegami ◽  
Joyce Tiyeko Kawakami ◽  
Shérrira Menezes Garavelo ◽  
Marcia Martins Reis ◽  
...  

BackgroundIdiopathic dilated cardiomyopathy (IDCM) myocardial inflammation may be associated with external triggering factors such as infectious agents. Here, we searched if moderate/severe heart transplantation rejection is related to the presence of myocardial inflammation in IDCM explanted hearts, associated with microbial communities.MethodReceptor myocardial samples from 18 explanted hearts were separated into groups according to post-transplant outcome: persistent moderate rejection (PMR; n = 6), moderate rejection (MR; n = 7) that regressed after pulse therapy, and no rejection (NR; n = 5)/light intensity rejection. Inflammation was quantified through immunohistochemistry (IHC), and infectious agents were evaluated by IHC, molecular biology, in situ hybridization technique, and transmission electron microscopy (TEM).ResultsNR presented lower numbers of macrophages, as well as B cells (p = 0.0001), and higher HLA class II expression (p ≤ 0.0001). PMR and MR showed higher levels of Mycoplasma pneumoniae (p = 0.003) and hepatitis B core (p = 0.0009) antigens. NR presented higher levels of parvovirus B19 (PVB19) and human herpes virus 6 (HHV6) and a positive correlation between Borrelia burgdorferi (Bb) and enterovirus genes. Molecular biology demonstrated the presence of M. pneumoniae, Bb, HHV6, and PVB19 genes in all studied groups. TEM revealed structures compatible with the cited microorganisms.ConclusionsThis initial study investigating on infectious agents and inflammation in the IDCM explanted hearts showed that the association between M. pneumoniae and hepatitis B core was associated with a worse outcome after HT, represented by MR and PMR, suggesting that different IDCM microbial communities may be contributing to post-transplant myocardial rejection.


2021 ◽  
Vol 8 ◽  
Author(s):  
You Luo ◽  
Zhanwen Dong ◽  
Xiao Hu ◽  
Zuofu Tang ◽  
Jinhua Zhang ◽  
...  

Objectives: We aimed to analyze the effect of cold ischemia time (CIT) on post-transplant graft function through mixed-effect model analysis to reduce the bias caused by paired mate kidneys.Methods: We reviewed all kidney transplantation records from 2015 to 2019 at our center. After applying the exclusion criteria, 561 cases were included for analysis. All donor characteristics, preservation and matching information, and recipient characteristics were collected. Transplant outcomes included delayed graft function (DGF) and estimated glomerular filtration rate (eGFR). Generalized linear mixed models were applied for analysis. We also explored potential effect modifiers, namely, donor death category, expanded criteria donors, and donor death causes.Results: Among the 561 cases, 79 DGF recipients developed DGF, and 15 recipients who died after surgery were excluded from the eGFR estimation. The median stable eGFR of the 546 recipients was 60.39 (47.63, 76.97) ml/min/1.73 m2. After adjusting for confounding covariates, CIT had a negative impact on DGF incidence [odds ratio = 1.149 (1.006, 1.313), P = 0.041]. In the evaluation of the impact on eGFR, the regression showed that CIT had no significant correlation with eGFR [β = −0.287 (−0.625, 0.051), P = 0.096]. When exploring potential effect modifiers, only the death category showed a significant interaction with CIT in the effect on eGFR (Pinteraction = 0.027). In the donation after brain death (DBD) group, CIT had no significant effect on eGFR [β = 0.135 (−0.433, 0.702), P = 0.642]. In the donation after circulatory death/donation after brain death followed by circulatory death (DCD/DBCD) group, CIT had a significantly negative effect on eGFR [β= −0.700 (−1.196, −0.204), P = 0.006]. Compared to a CIT of 0–6 h, a CIT of 6–8 or 8–12 h did not decrease the post-transplant eGFR. CIT over 12 h (12–16 h or over 16 h) significantly decreased eGFR. With the increase in CIT, the regenerated eGFR worsened (Ptrend = 0.011).Conclusion: Considering the effect of paired mate kidneys, the risk of DGF increased with prolonged CIT. The donor death category was an effect modifier between CIT and eGFR. Prolonged CIT did not reduce the eGFR level in recipients from DBDs but significantly decreased the eGFR in recipients from DCDs/DBCDs. This result indicates the potential biological interaction between CIT and donor death category.


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