scholarly journals In-depth time-dependent analysis of the benefit of Allo-HSCT for elderly patients with CR1 AML: a FILO study

2021 ◽  
Author(s):  
Raynier Devillier ◽  
Edouard Forcade ◽  
Alice Garnier ◽  
Sarah Guenounou ◽  
Sylvain Thepot ◽  
...  
Keyword(s):  
Myeloid Leukemia ◽  
Risk Group ◽  
Time Dependent ◽  
Multistate Model ◽  
Dynamic Prediction ◽  
Hematopoietic Stem ◽  
Landmark Model ◽  
The Impact ◽  
Time Dependent Analysis

The benefit of allogeneic hematopoietic stem cell transplantation (Allo-HSCT) for acute myeloid leukemia (AML) patients over 60 years remains a matter of debate, notably when performed in first complete remission (CR1). In order to clarify this issue, the French Innovative Leukemia Organization (FILO) performed a 10-year real-world time-dependent analysis. The study enrolled patients between 60 and 70 years of age with AML in CR1 after intensive chemotherapy with intermediate (IR) or unfavorable (UR) risk according to the European LeukemiaNet (ELN)-2010. The impact of Allo-HSCT was analyzed through three models, respectively i) time-dependent Cox, ii) multistate for dynamic prediction and iii) super landmark. The study enrolled 369 (73%) IR and 138 (27%) UR AML patients, 203 of whom received an Allo-HSCT. Classical multivariate analysis showed that Allo-HSCT significantly improved relapse-free (RFS; Hazard Ratio/HR [95%CI]: 0.47 [0.35-0.62], p<0.001) and overall (OS; HR [95%CI]: 0.56 [0.42-0.76], p<0.001) survivals, independently of the ELN risk group. With the multistate model, the predicted 5-year probability for IR and UR patients to remain in CR1 without Allo-HSCT was 8% and 1%, respectively. Dynamic predictions confirmed that patients without Allo-HSCT continue to relapse over time. Finally, the super landmark model showed that Allo-HSCT significantly improved RFS (HR [95%CI]: 0.47 [0.36-0.62], p<0.001) and OS (HR [95%CI]: 0.54 [0.40-0.72], p<0.001). Allo-HSCT in CR1 is demonstrated here to significantly improve the outcome of fit older AML patients. Long-term RFS without Allo-HSCT is very low (<10%), supporting Allo-HSCT as being the best curative option for these patients.

scholarly journals Allogeneic Hematopoietic Stem Cell Transplantation Improves Outcome of Elderly Patients with Acute Myeloid Leukemia in First Complete Remission: A Time-Dependent and Multistate Analysis from the French Innovative Leukemia Organization

Blood ◽  
2018 ◽  
Vol 132 (Supplement 1) ◽  
pp. 209-209 ◽  
Author(s):  
Raynier Devillier ◽  
Edouard Forcade ◽  
Alice Garnier ◽  
Sylvain Thepot ◽  
Gaelle Guillerm ◽  
...  
Keyword(s):  
Myeloid Leukemia ◽  
Risk Group ◽  
Cox Model ◽  
Risk Groups ◽  
Time Dependent ◽  
Inclusion Criteria ◽  
Multistate Model ◽  
Initial State ◽  
Free Survival ◽  
First Complete Remission

Abstract Allogeneic stem cell transplantation (AlloSCT) is a curative option for acute myeloid leukemia (AML) patients. In first complete remission (CR1), young patients (< 60 years) with intermediate or unfavorable ELN disease risk are usually considered for AlloSCT. In contrast, because of the expected higher toxicity in older patients, the benefit of this treatment remains a matter of debate after 60 years, especially in the intermediate ELN risk group. In this multicenter analysis from the French Innovative Leukemia Organization (FILO), we investigated whether AlloSCT was beneficial for AML patients over 60 years old in CR1. Inclusion criteria were: patients between 60 and 70 years of age diagnosed with AML from 2007 to 2017; CR1 after intensive chemotherapy; ELN-2010 intermediate or unfavorable risk group. AlloSCT was evaluated as a time dependent variable in survival calculations and in a multivariate Cox model adjusted on age, ELN group, transplantation period and stratified by transplantation center. We also used a multistate model as follow: initial state for all patients was "No Allo - CR" with time 0 at the time of CR. From initial state, patients can transit to "Allo-CR", or move through 2 absorbing states (non-relapse death (No Allo-NRM) or relapse (No Allo-Relapse). Similarly, once transplanted (i.e. in the state "Allo-CR"), patients can move to "Allo-Relapse" or "Allo - NRM" when such events occurred. The model allows the dynamic prediction of probability for a patient to be in a specific state considering specific initial state and time. We analyzed 521 consecutive patients in 6 centers who matched inclusion criteria. Median age was 65 years (range: 60-70). ELN-2010 risk was intermediate and unfavorable in 376 (72%) and 145 (28%) patients, respectively. While all patients had a theoretical indication for AlloSCT in CR1, 199 (38%) were actually transplanted (129 (34%) and 70 (48%) in the intermediate and unfavorable risk group, respectively). In the whole cohort, AlloSCT as time-dependent variable significantly improved relapse-free survival ([RFS] at 5 years, No AlloSCT vs. AlloSCT: 14% vs. 47% p < 0.001) and overall survival ([OS] at 5 years, No AlloSCT vs. AlloSCT: 24% vs. 51% p < 0.001). In subgroup analysis based on ELN-2010 risk classification, AlloSCT significantly improved outcome of both ELN intermediate (No AlloSCT vs. AlloSCT: 5-y RFS: 16% vs. 50% p < 0.001; 5-y OS: 26% vs. 54% p < 0.001) and unfavorable (No AlloSCT vs. AlloSCT: 5-y RFS: 7% vs. 44% p < 0.001; 5-y OS: 17% vs. 46% p < 0.001) risk group patients (Figure A and B). By multivariate time-dependent Cox model, AlloSCT significantly decreased the risk of relapse (HR [95%CI]: 0.29 [0.20-0.41] p < 0.001) and increased the risk of NRM (HR [95%CI]: 2.61 [1.38-4.94] p = 0.003). This led to a significant advantage for AlloSCT in both RFS (HR [95%CI]: 0.48 [0.36-0.64] p < 0.001) and OS (HR [95%CI]: 0.60 [0.44-0.81] p = 0.001). This benefit was observed in both intermediate and unfavorable ELN-2010 risk groups, with lower risk of relapse (intermediate: HR [95%CI]: 0.30 [0.19-0.46] p < 0.001; unfavorable: HR [95%CI]: 0.37 [0.19-0.72] p = 0.004) and better OS (intermediate: HR [95%CI]: 0.67 [0.47-0.96] p = 0.028; unfavorable: HR [95%CI]: 0.51 [0.29-0.91] p = 0.022). Multistate model showed that 5 years after CR1, few patients were still alive in CR without AlloSCT (i.e. in the initial "No Allo-CR" state), whatever the ELN-2010 risk group (intermediate: 9%; unfavorable: 1% Figure C and D). Among patients who were transplanted, the probability for transiting to Allo-NRM state within 5 years post CR1 was 17% and 24% in intermediate and unfavorable ELN-2010 groups, respectively. Corresponding values for patients without AlloSCT transiting to No Allo-NRM state were 11% and 12%. Moreover, considering a landmark at 6 months after CR1, the multistate model showed that patients who received AlloSCT had lower probability of relapse at 5 years (22% and 33% in intermediate and unfavorable ELN-2010 groups, respectively) compared to those who did not (68% and 78% in intermediate and unfavorable groups, respectively). AlloSCT for CR1 AML patients over 60 years of age is routinely feasible and significantly improves outcome in both intermediate and unfavorable ELN-2010 risk groups. Less than 10% of patients are long term disease free survival without AlloSCT, even in intermediate risk group, supporting that AlloSCT remains the first curative option for these patients. Figure. Figure. Disclosures No relevant conflicts of interest to declare.

scholarly journals Changes in the Multipotent Stromal Mesenchymal Cells from the Bone Marrow of the Patients with Hematological Diseases in Debut and after the Treatment

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 5014-5014
Author(s):  
Irina N. Shipounova ◽  
Nataliya A. Petinati ◽  
Nina J. Drize ◽  
Aminat A. Magomedova ◽  
Ekaterina A. Fastova ◽  
...  
Keyword(s):  
Gene Expression ◽  
Bone Marrow ◽  
Stromal Cells ◽  
Myeloid Leukemia ◽  
Marker Gene ◽  
Malignant Cells ◽  
Hematopoietic Stem ◽  
Stromal Microenvironment ◽  
Expression Of Genes

Introduction. Stromal microenvironment of the bone marrow (BM) is essential for normal hematopoiesis; the very same cells are involved in the interaction with the leukemic stem cells. The aim of the study was to reveal the alterations in stromal microenvironment of patients in debut and after the therapy using multipotent mesenchymal stromal cells (MSC) as a model. Methods. MSC of patients with acute myeloid leukemia (AML, N=32), acute lymphoblastic leukemia (ALL, N=20), chronic myeloid leukemia (CML, N=19), and diffuse large B-cell lymphoma without BM involvement (DLBCL, N=17) were isolated by standard method from the patients' BM. Each BM sample was acquired during diagnostic aspiration after the informed signed consent was obtained from the patient. Groups of BM donors comparable by age and gender were used as controls for each nosology. Gene expression was analyzed with real-time RT-PCR. The significance of differences was evaluated with Mann-Whitney U-test. Results. The results of gene expression analysis are summarized in Table. The expression of genes regulating hematopoietic stem and precursor cells (JAG1, LIF, IL6) was significantly upregulated in MSC of the patients in debut, except for DLBCL. The latter was characterized with upregulation of osteogenic marker gene SPP1 and downregulation of FGFR1 gene. The upregulation of the expression of genes regulating proliferation of stromal cells (PDGFRA, FGFR1) and adipogenic marker gene (PPARG) was common for AML and CML. Both acute leukemias were characterized by the upregulation of genes associated with inflammation and regulation of hematopoietic precursors (CSF1, IL1B, IL1BR1) and by the downregulation of chondrogenic differentiation marker gene (SOX9). CML and DLBCL demonstrated the upregulation of FGFR2. BM of the DLBCL patients did not contain any malignant cells; nevertheless, stromal precursors from the BM were significantly affected. This indicates the distant effects of DLBCL malignant cells on the patients' BM. Myeloid malignancies seem to affect MSC more profoundly then lymphoid ones. Effect of leukemic cells on stromal microenvironment in case of myeloid leukemia was more pronounced. The treatment significantly affected gene expression in MSC of patients. In all studied nosologies the IL6 gene expression was upregulated, which may reflect the inflammation processes ongoing in the organism. The expression of LIF was upregulated and ICAM1, downregulated in MSCs of AML, ALL, and CML patients. In the MSC of patients with AML, who had received the highest doses of cytostatic drugs to achieve remission, a significant decrease in the expression of most studied genes was found. In patients with ALL with long-term continuing treatment in combination with lower doses of drugs, IL1B expression was increased, while the decrease in expression was detected for a number of genes regulating hematopoietic stem cells (SDF1, TGFB1), differentiation and proliferation (SOX9, FGFR1, FGFR2). Treatment of CML patients is based on tyrosine kinase inhibitors in doses designed for long-term use, and is less damaging for MSC. The upregulation of TGFB1, SOX9, PDGFRA genes and downregulation of IL1B gene was revealed. MCS of DLBCL patients, unlike the other samples, were analyzed after the end of treatment. Nevertheless, significant upregulation of IL8 and FGFR2 genes was found. Thus, both the malignant cells and chemotherapy affect stromal precursor cells. The changes are not transient; they are preserved for a few months at least. MSCs comprise only a minor subpopulation in the BM in vivo. When expanded in vitro, they demonstrate significant changes between groups of patients and healthy donors. Conclusions. Leukemia cells adapt the stromal microenvironment. With different leukemia, the same changes are observed in the expression of genes in MSC. MSC of patients with acute forms have a lot of changes which coincide among these two diseases. MSC of AML patients are most affected both in debut and after the therapy. Treatment depends on the nosology and in varying degrees changes the MSC. This work was supported by the Russian Foundation for Basic Research, project no. 17-00-00170. Disclosures Chelysheva: Novartis: Consultancy, Honoraria; Fusion Pharma: Consultancy. Shukhov:Novartis: Consultancy; Pfizer: Consultancy. Turkina:Bristol Myers Squibb: Consultancy; Novartis: Consultancy, Speakers Bureau; Pfizer: Consultancy; Novartis: Consultancy, Speakers Bureau; fusion pharma: Consultancy.

scholarly journals The KDM4/JMJD2 histone demethylases are required for hematopoietic stem cell maintenance

Blood ◽  
2019 ◽  
Vol 134 (14) ◽  
pp. 1154-1158 ◽  
Author(s):  
Karl Agger ◽  
Koutarou Nishimura ◽  
Satoru Miyagi ◽  
Jan-Erik Messling ◽  
Kasper Dindler Rasmussen ◽  
...  
Keyword(s):  
Myeloid Leukemia ◽  
Clinical Use ◽  
Histone Demethylases ◽  
Hematopoietic Stem ◽  
Stem Cell Maintenance ◽  
Demethylase Activity ◽  
Cell Maintenance ◽  
Acute Myeloid

Abstract KDM4 and JMJD2 are histone demethylases that are considered promising targets for treatment of MLL translocation–bearing acute myeloid leukemia. Agger and colleagues demonstrate an important role of KDM4 activity in long-term normal hematopoiesis that should be considered when contemplating the clinical use of long-term inhibition of KDM4 demethylase activity.

scholarly journals Molecular pathogenesis of progression to myeloid leukemia from TET-insufficient status

2020 ◽  
Vol 4 (5) ◽  
pp. 845-854 ◽  
Author(s):  
Raksha Shrestha ◽  
Mamiko Sakata-Yanagimoto ◽  
Koichiro Maie ◽  
Motohiko Oshima ◽  
Masatomo Ishihara ◽  
...  
Keyword(s):  
Median Survival ◽  
Myeloid Leukemia ◽  
Recurrent Events ◽  
Loss Of Function ◽  
Genetic Event ◽  
Hematopoietic Stem ◽  
Age Related ◽  
Whole Exome ◽  
Recurrent Mutations ◽  
The Impact

Abstract Loss-of-function mutations in ten-eleven translocation-2 (TET2) are recurrent events in acute myeloid leukemia (AML) as well as in preleukemic hematopoietic stem cells (HSCs) of age-related clonal hematopoiesis. TET3 mutations are infrequent in AML, but the level of TET3 expression in HSCs has been found to decline with age. We examined the impact of gradual decrease of TET function in AML development by generating mice with Tet deficiency at various degrees. Tet2f/f and Tet3f/f mice were crossed with mice expressing Mx1-Cre to generate Tet2f/wtTet3f/fMx-Cre+ (T2ΔT3), Tet2f/fTet3f/wtMx-Cre+ (ΔT2T3), and Tet2f/fTet3f/fMx-Cre+ (ΔT2ΔT3) mice. All ΔT2ΔT3 mice died of aggressive AML at a median survival of 10.7 weeks. By comparison, T2ΔT3 and ΔT2T3 mice developed AML at longer latencies, with a median survival of ∼27 weeks. Remarkably, all 9 T2ΔT3 and 8 ΔT2T3 mice with AML showed inactivation of the remaining nontargeted Tet2 or Tet3 allele, respectively, owing to exonic loss in either gene or stop-gain mutations in Tet3. Recurrent mutations other than Tet3 were not noted in any mice by whole-exome sequencing. Spontaneous inactivation of residual Tet2 or Tet3 alleles is a recurrent genetic event during the development of AML with Tet insufficiency.

scholarly journals Multivariable time-dependent analysis of the impact of azacitidine in patients with lower-risk myelodysplastic syndrome and unfavorable specific lower-risk score

2015 ◽  
Vol 39 (1) ◽  
pp. 52-57 ◽  
Author(s):  
Jose Falantes ◽  
Regina García Delgado ◽  
Cristina Calderón-Cabrera ◽  
Francisco J. Márquez-Malaver ◽  
David Valcarcel ◽  
...  
Keyword(s):  
Myelodysplastic Syndrome ◽  
Risk Score ◽  
Lower Risk ◽  
Time Dependent ◽  
The Impact ◽  
Time Dependent Analysis

Long-term follow-up of allogeneic hematopoietic stem-cell transplantation with reduced-intensity conditioning for patients with chronic myeloid leukemia

Blood ◽  
2007 ◽  
Vol 110 (9) ◽  
pp. 3456-3462 ◽  
Author(s):  
Partow Kebriaei ◽  
Michelle A. Detry ◽  
Sergio Giralt ◽  
Antonio Carrasco-Yalan ◽  
Athanasios Anagnostopoulos ◽  
...  
Keyword(s):  
Stem Cell ◽  
Chronic Myeloid Leukemia ◽  
Hematopoietic Stem Cell Transplantation ◽  
Myeloid Leukemia ◽  
Chronic Phase ◽  
Reduced Intensity Conditioning ◽  
Hematopoietic Stem ◽  
Reduced Intensity

Abstract Allogeneic hematopoietic stem-cell transplantation (HSCT) remains an effective strategy for inducing durable remission in chronic myeloid leukemia (CML). Reduced-intensity conditioning (RIC) regimens extend HSCT to older patients and those with comorbidities who would otherwise not be suitable candidates for HSCT. The long-term efficacy of this approach is not established. We evaluated outcomes of 64 CML patients with advanced-phase disease (80% beyond first chronic phase), not eligible for myeloablative preparative regimens due to older age or comorbid conditions, who were treated with fludarabine-based RIC regimens. Donor type was matched related (n =30), 1 antigen-mismatched related (n =4), or matched unrelated (n =30). With median follow-up of 7 years, overall survival (OS) and progression-free survival (PFS) were 33% and 20%, respectively, at 5 years. Incidence of treatment-related mortality (TRM) was 33%, 39%, and 48% at 100 days, and 2 and 5 years after HSCT, respectively. In multivariate analysis, only disease stage at time of HSCT was significantly predictive for both OS and PFS. RIC HSCT provides adequate disease control in chronic-phase CML patients, but alternative treatment strategies need to be explored in patients with advanced disease. TRM rates are acceptable in this high-risk population but increase over time.

Allogeneic Hematopoietic Stem Cell Transplantation Cures CLL: A Retrospective Analysis from the SFGM-TC Registry.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 2991-2991
Author(s):  
Mauricette Michallet ◽  
Quoc-Hung Lê ◽  
Jean-Paul Vernant ◽  
Franck E. Nicolini ◽  
Jean-Luc Harousseau ◽  
...  
Keyword(s):  
Autologous Transplantation ◽  
Disease Status ◽  
Allogeneic Transplantation ◽  
Cell Transplant ◽  
Hematopoietic Stem ◽  
Cord Blood Cell ◽  
The Status ◽  
The Impact ◽  
Long Term Survivors

Abstract This retrospective study concerned 471 B-CLL patients registered in the SFGM-TC registry from Apr 1,984 to Feb 2,005, who underwent either autologous transplantation (n=313, 138 F and 175 M, median age = 54, 236 PBSC and 77 BM) or allogeneic transplantation (n=158, 78 F and 80 M, median age = 49, 76 PBSC, 81 BM and 1 cord blood cell transplant from 17 related and 141 unrelated donors). Among alloT patients, 50 were ABO incompatible and 70 sex-mismatched. The median interval diagnosis-transplantation was 32 months for autoT and 51 months for alloT. Just before conditioning 302 autoT and 143 alloT were evaluated for the disease status: 100 and 26 patients were in CR, 170 and 55 were in PR, 4 and 13 in stable disease (SD), 28 and 49 in progressive disease (PD) for autoT and alloT respectively. Among alloT patients, 73 received reduced intensity conditioning (RIC) and 85 standard conditioning (72 Cyt+TBI, 33 Fluda+TBI, 23 Fluda+Bu+ATG, 8 Cyt+Bu and 21 other). Before autoT the conditioning consisted of 224 Cyt+TBI, 45 BEAM and 44 other. After alloT, 71 patients developed an aGVHD ≥ grade II and 60 developed a cGVHD (25 limited and 35 extensive). The non-relapse mortality at 1 year was 29%. With a mean follow-up of 28 months for autoT and 40 months for alloT, the probabilities of 3-year, 5-year and 8-year overall survival were 80%, 66%, 45.5% after autoT and 52%, 48% and 35% after alloT respectively. An analysis aimed to determine the percentage of long-term survivors, or patients censored on the final plateau of survival curves was performed on alloT and autoT groups. A mixture model, gfcure with Splus statistical package determined the percentages of long-term survivors and its adequacy was verified graphically. The percentage of long-term survivors for the autoT group was 1.2%, with a mean survival length for uncured population of 160 months. Fig A shows that both curves were close and consequently shows good adequacy and the absence of a final plateau. The percentage of long-term survivors for alloT was 34.03% (figure1). Fig B shows rather good adequacy. The study of the impact of usual prognosis factors (age, time diagnosis-transplant, sex match, HLA match, CMV status, type of conditioning, BM or PBSC, ABO compatibility and disease status before transplantation) on the percentage of long-term survivors showed that only the status of disease at transplant had a significant impact: (CR vs SD or PD, HR: 0.11 [0.02–0.5] p=0.01 and PR vs SD or PD, HR: 0.30 [0.09–0.96] p=0.04). This study pointed out the possibility of curing B-CLL patients who responded to conventional chemotherapy with allogeneic transplantation rather than with autologous transplantation. Figure Figure Figure Figure

Impact of Chimerism and Other Transplant Variables on Allogeneic Transplant Outcome after Reduced Intensity Conditioning (RIC) Regimens.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 5258-5258
Author(s):  
Veronica Ortiz Corbella ◽  
Quoc-Hung Lê ◽  
Franck E. Nicolini ◽  
Anne Thiébaut ◽  
Xavier Thomas ◽  
...  
Keyword(s):  
Stem Cell ◽  
Myeloid Leukemia ◽  
Mixed Chimerism ◽  
Unrelated Donor ◽  
Linear Regression Method ◽  
Hematopoietic Stem ◽  
Transplant Outcome ◽  
Post Transplant ◽  
The Impact

Abstract RIC regimens followed by allogeneic hematopoietic stem cell transplantation (HSCT) were evaluated in patients with hematologic malignancies who were not candidates for conventional transplantation because of age or medical co-morbidities. In this kind of transplantation, the analysis of chimerism kinetics remains fundamental. The main aims of this study were to evaluate and compare the impact of pre- and post-transplant variables and chimerism on transplantation outcome. Chimerism status was evaluated in total blood (TB) and in purified CD3+ cells using quantitative PCR (STR/SNP) for all. We analysed donor type and kinetics chimerism of 52 patients (32 M - 20 F) who had undergone allogeneic HSCT after RIC for hematological malignancies. Median age was 40 years (range 25–67 years). Diagnosis were multiple myeloma: 16, acute myeloid leukemia: 13, myelodysplasia: 6, chronic lymphocytic leukemia: 5, Non Hodgkin’s lymphoma: 5, acute lymphoblastic leukemia: 1, chronic myeloid leukemia: 2 and primitive myelofibrosis: 4. Conditioning regimens were Fludarabine + Busulfan in 33 patients, Fludarabine + 2 Gys total body irradiation 15, Cyclophasphamide 3 (2 alone/one with Busulfan) and one other chemotherapy. Stem cell source was PB in all except one who received cord blood. Fourty-eight were identical sibling and 4 unrelated donor transplantations. At transplant, 17 patients were in CR, 21 PR and 14 in evolutive diseases. All patients except one engrafted. Twenty-five developed aGVHD ≥ Grade II (16 Grade III-IV). At the last follow-up 22 patients died (9 disease progression and 13 of transplant related mortality, 30 were alive (18 developed chronic graft vs Host disease (cGVHD) 12 extensive/6 limited cGHVD). Among 52 patients, only 49 had a long-term chimerism documentation of CD3 subpopulation (43 TB and CD3+ cells): 15 (14 TB) were full donor chimerism (FDC) throughout the follow-up, and 34 remained mixed chimerism (MC). Among these 34 (29 TB) MC patients at the latest follow-up, 7 (5 TB) remained in MC, 2 (5 TB) converted to recipient profile and 25 (19 TB) converted to donor profile. Univariate analysis demonstrated the close correlation between chimerism status evaluated on PB CD3+ cells only at any time post-transplant and the onset of aGVHD (p = 0.0391) but not cGVHD. Multivariate analysis according to linear regression method did not find any impact of the following variables on chimerism kinetics after RIC transplant: disease status before transplant, age, sex, type of RIC regimen, number of days of ATG, aGVHD (p ≥ 0.11). In conclusion, this study underlines the tight correlation that exists between chimerism status and kinetics on CD3+ PB subpopulations after RIC transplant and acute GVHD development that impacts on transplant outcome.

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