- Open Access
Outcomes of allogeneic haematopoietic stem cell transplantation for paediatric patients with MLL-rearranged acute myeloid leukaemia
BMC Cancer volume 22, Article number: 896 (2022)
The presence of mixed-lineage leukaemia rearrangement (MLL-r) in paediatric patients with acute myeloid leukaemia (AML) is a poor prognostic predictor. Whether allogeneic haematopoietic stem cell transplantation (allo-HSCT) is beneficial in such cases remains unclear.
We evaluated the outcomes and prognostic factors of allo-HSCT in 44 paediatric patients with MLL-r AML in the first complete remission (CR1) between 2014 and 2019 at our institution.
For all the 44 patients, the 3-year overall survival (OS), event-free survival (EFS), and cumulative incidence of relapse (CIR) were 74.5%, 64.1%, and 29.1%, respectively. Among them, 37 (84.1%) patients received haploidentical (haplo)-HSCT, and the 3-year OS, EFS, and CIR were 73.0%, 65.6%, and 26.4%, respectively. The 100-day cumulative incidence of grade II–IV acute graft-versus-host disease (aGVHD) post-transplantation was 27.3%, and that of grade III–IV aGVHD was 15.9%. The overall 3-year cumulative incidence of chronic graft-versus-host disease (cGVHD) post-transplantation was 40.8%, and that of extensive cGVHD was 16.7%. Minimal residual disease (MRD)-positive (MRD +) status pre-HSCT was significantly associated with lower survival and higher risk of relapse. The 3-year OS, EFS, and CIR differed significantly between patients with MRD + pre-HSCT (n = 15; 48.5%, 34.3% and 59%) and those with MRD-pre-HSCT (n = 29; 89.7%, 81.4% and 11.7%). Pre-HSCT MRD + status was an independent risk factor in multivariate analysis.
Allo-HSCT (especially haplo-HSCT) can be a viable strategy in these patients, and pre-HSCT MRD status significantly affected the outcomes.
With continuous advances in treatment strategies, the overall survival (OS) rate of paediatric acute myeloid leukaemia (AML) is almost 70% [1,2,3,4]. Nevertheless, the cure rates for different subtypes vary. The presence of MLL rearrangements (MLL-r), which are detected in 15%–20% of all patients with AML, predict an overall poor prognosis [2, 5, 6]. In a recent study involving a large cohort of paediatric patients, the long-term overall survival (OS) and event-free survival (EFS) were only 56% and 44%, respectively, with an association between different translocation partners and large differences in prognoses . Therefore, there is room for advances in the current therapeutic strategies for paediatric MLL-r AML.
According to the European Leukaemia Net-2017 risk stratification, adult patients with MLL-r except t(9;11) were considered high-risk patients , and allogeneic haematopoietic stem cell transplantation (allo-HSCT) in the first complete remission (CR1) could lead to a more favourable outcome [8,9,10]. However, paediatric patients with MLL-r have been classified as intermediate-risk patients in some clinical trials and as high-risk patients in others. Considering the continuous advances in chemotherapy and transplantation-related toxicity effects, HSCT in CR1 is restricted to high-risk paediatric AML . Therefore, it remains controversial whether allo-HSCT should be performed in paediatric MLL-r AML. Several studies have shown that allo-HSCT is a curative option and is beneficial in paediatric MLL-r AML, especially in the poor prognosis subgroups with MLL-ALL1-fused gene from chromosome 6 (MLL-AF6) or MLL-AF10 [6, 11]. However, due to their low incidence, the number of reported cases documenting the use of allo-HSCT are limited. Therefore, more studies are needed to improve the knowledge of allo-HSCT for this type of leukaemia.
This study aimed to explore the role of allo-HSCT (especially haploidentical [haplo]-HSCT) in the treatment of paediatric patients with MLL-r AML in CR1 and investigated the prognostic factors of these patients.
Between January 2014 and October 2019, 44 paediatric patients aged greater than or equal to 1 year and less than 18 years with MLL-r AML who received allogeneic HSCT in CR1 at our institution were enrolled into this study. The diagnosis of AML was made according to the Morphology, Immunology, Cytogenetics, and Molecular biology criteria , and the risk stratification was mainly based on cytogenetics, molecular features, and disease response [13, 14]. MLL-r was detected using one of three ways: karyotype analysis, fluorescence in situ hybridisation (FISH) test, or quantitative real-time polymerase chain reaction (qRT-PCR) [11, 15,16,17]. This clinical study was approved by the Ethics Committee of Peking University People’s Hospital and was carried out in accordance with the Declaration of Helsinki. Written informed consent for participation was obtained from the parents/guardians of all the patients.
Chemotherapy before transplantation
The patients received an initial 8-day induction therapy consisting of cytarabine (150 mg/m2 on days 1–7), idarubicin (10 mg/m2 on days 3 and 5), and etoposide (100 mg/m2 on days 6–8). After two induction cycles, the subsequent consolidation chemotherapy was administered as previously reported , consisting of three regimens used alternately: AD (cytarabine 4 g/m2 on days 1–4 and idarubicin 10 mg/m2 on days 2 and 4), HA (cytarabine 150 g/m2 on days 1–7 and homoharringtonine 3 mg/m2 for days 1–7), and ADVP16 (cytarabine 150 mg/m2 on days 1–7, idarubicin 10 mg/m2 on days 3 and 5, and etoposide 100 mg/m2 on days 6–8). Patients with cKIT mutations were administered dasatinib (75 mg/m2/d) during chemotherapy intermission.
After two induction cycles and several cycles of consolidation therapy, all patients underwent allo-HSCT in CR1. Seven patients had human leukocyte antigen (HLA)-matched donors (one underwent matched unrelated donor transplant [MUDT], six underwent matched sibling donor transplant [MSDT]), and the remaining 37 patients had haploidentical donors (HIDs) and opted for haplo-HSCT. As reported previously [15, 18, 19], the conditioning regimens for haplo-HSCT and MUDT were essentially the same, consisting of cytarabine (4 g/m2/d) on days 9 and 10, busulfan (0.8 mg/kg/every 6 h) on days 6–8, cyclophosphamide (1.8 g/m2/d) on days 4–5, semustine (250 mg/m2) on day 3, and anti-thymocyte globulin (ATG) (2.5 mg/kg/d; Sang Stat, Lyon, France) on days 2–5. The conditioning regimen for MSDT was identical to that for haplo-HSCT without ATG. Cyclosporine A (CSA, intravenous infusion), mycophenolate mofetil (MMF, oral administration), and short-term methotrexate (MTX intravenous infusion) were administered to all patients for graft-versus-host disease (GVHD) prophylaxis. CSA was started on day − 3 at 2.5 mg/kg/d. CSA concentrations were monitored weekly and adjusted to maintain a trough concentration of 150 to 250 ng/mL. CSA dosage was decreased gradually in subjects without GVHD on day + 180. Mycophenolate mofetil 15 mg/kg was administered every 12 h from day − 3 to day + 30. MTX 15 mg/m2 was administered on day + 1 and reduced to 10 mg/m2 on days + 3, + 5, and + 11 . Regarding morphological evaluations, flow cytometry and quantitative measurements of MLL-r by qRT-PCR in bone marrow (BM) samples were performed at scheduled time points to detect minimal residual disease (MRD) (within two weeks before the start of the preparative regimen; 1, 2, 3, 4, 5, 6, 9, and 12 months post-HSCT, then every 6 months thereafter).
Complete remission (CR) was defined as the detection of < 5% bone marrow blasts without any localized leukemic infiltrates. MRD-positive (MRD +) status was defined as CR with the presence of MLL rearrangements detected on qRT-PCR and/or positive expression (≥ 10–4 myeloblasts) of MRD detected via flow cytometry. MRD-negative (MRD-) status was defined as CR with negativity for MLL rearrangements by qRT-PCR and negative expression (< 10–4 myeloblasts) of MRD detected via flow cytometry. Relapse was defined as the detection of ≥ 5% bone marrow blasts and/or extramedullary leukaemia. Clinical graft-versus-host disease (GVHD) occurring prior to 100 days after HSCT is called acute GVHD (aGVHD), and that occurring after 100 days is called chronic GVHD (cGVHD). The major organs involved in acute GVHD were the skin, gastrointestinal tract, and liver. The diagnosis of GVHD was in accordance with the common international criteria [21, 22].
OS was defined as the time from transplantation to death or last follow-up, and EFS was defined as the time from transplantation to the first event (relapse at any site, death, or secondary malignancy) or last follow-up. Non-relapse mortality (NRM) was defined as death without prior relapse or progression. The cumulative incidence of relapse (CIR) was calculated from the date of CR to the first relapse. Considering the competing risks of death and relapse, competing risk analysis was performed to assess the cumulative incidence. The chi-square test or Fisher’s exact test were used to estimate significant differences between group comparisons. Kaplan–Meier methods and the log-rank test were used to estimate and compare OS and EFS. All significant prognostic factors in a univariate analysis with P < 0.1 were included in a multiple Cox regression model. Data analysis was performed using SPSS 22.0 (IBM, Armonk, NY) and R version 3.5.3 (R Foundation for Statistical Computing, Vienna, Austria). The level of statistical significance was set at P < 0.05.
A total of 44 paediatric patients were included in our study between January 2014 and October 2019. Table 1 summarises the patients’ characteristics. The population included 19 (43.1%) female and 25 (56.8%) male patients, with a median age of 9.0 (range, 1.1–17.0) years. The most common FAB classification was M5. The most frequent MLL-r subtype was t(9;11)(p22;q23)/AF9 (22.7%), followed by MLL-partial tandem duplication (PTD) (18.2%), t(10;11)(p13;q23)/AF10 (15.9%), t(11;19)(q23;p13.1)/ELL (11.4%), t(6;11)(q27;q23)/AF6 (9.1%), t(1;11)(q21;q23) /AF1Q (6.8%) and t(11;19)(q23;p13.3)/ENL (4.5%). Twenty-seven (61.4%) patients achieved CR after the first cycle of induction. Twelve (27.3%) patients achieved CR after the second cycle of induction, and 5 (11.4%) patients achieved CR after the third cycle of chemotherapy. All the patients were in CR1 at the time of HSCT. The median interval between diagnosis to allo-HSCT was 4 months (range, 3–7 months). In total, 37 (84.1%) patients underwent haplo-HSCT.
Engraftment and GVHD
One patient died on the eighth day after transplantation due to intracranial infection without neutrophil and platelet engraftment. Another patient died on the thirty-ninth day after transplantation due to severe GVHD without platelet engraftment. Thus, 43 patients achieved neutrophil engraftment with a median time to engraftment of 12 (range, 8–23) days, and 42 patients achieved platelet engraftment with a median time to engraftment of 16 (range, 8–85) days. For all the 44 patients, the 100-day cumulative incidence of grade II–IV aGVHD was 27.3% ± 6.7% (95% confidence interval [CI]: 15.1%–41.0%), and that of grade III–IV aGVHD was 15.9% ± 5.5% (95% CI: 6.9%–28.2%). As of the last follow-up, 42 patients survived for more than 100 days after HSCT. The overall 3-year cumulative incidence of cGVHD was 40.8% ± 8.2% (95% CI: 24.5%–56.5%), and that of extensive cGVHD was 16.7% ± 6.9% (95% CI: 5.8%–32.3%). Meanwhile, for the 37 patients who received haplo-HSCT, the 100-day cumulative incidence of grade II–IV aGVHD and grade III–IV aGVHD was 32.4% ± 7.7% (95% CI: 18.1%–47.7%) and 18.9% ± 6.4% (95% CI: 8.2%–33.0%), respectively. The 3-year cumulative incidence of cGVHD and extensive cGVHD was 45.2% ± 8.8% (95% CI: 27.3%–61.6%) and 18.7% ± 7.6% (95% CI: 6.5%–35.7%). In contrast, for the remaining 7 patients who received HLA-matched transplants, only one patient developed grade I aGVHD.
Relapse and NRM
The median follow-up period was 27.0 (range, 0.3–82) months. Up to the last follow-up date (December 21, 2020), 11 patients experienced relapse at a median of 11 (range, 3–33) months after HSCT. Nine patients had only a haematologic relapse, while two patients had an extramedullary relapse, followed by a haematologic relapse. Of them, six received chemotherapy plus donor lymphocyte infusion (DLI), two received DLI only, one received chemotherapy plus secondary transplantation, one received chemotherapy only, and one abandoned further therapy. During the follow-up period, 12 patients died. The causes of death included relapse (n = 8) and NRM (n = 4). Of the 4 patients who died of NRM: two died of infection, one of aGVHD, and one due to suicide.
OS, EFS, and CIR
For all the 44 patients, the 3-year OS, EFS, and CIR were 74.5% ± 7.2% (95% CI, 57.2%–85.6%), 64.1% ± 8.0% (95% CI: 46.3%–77.4%), and 29.1% ± 7.7% (95% CI: 15.1–44.8%), respectively (Fig. 1). Meanwhile, for the 37 patients who received haplo-HSCT, the 3-year OS, EFS, and CIR were 73.0% ± 7.9% (95% CI: 53.9%–85.2%), 65.6% ± 8.2% (95% CI: 47.1%–78.9%), and 26.4% ± 7.7% (95% CI: 19.8–42.2%), respectively (Fig. 2).
Impact of MRD status at pre-HSCT
In total, 29 patients were MRD- (MRD- pre-HSCT cohort), and 15 patients were MRD + (MRD + pre-HSCT cohort) pre-HSCT. The two cohorts had similar baseline characteristics (Table 2).
The survival difference between the two cohorts was significant. The 3-year OS was 89.7% ± 5.7% (95% CI: 71.3%–96.5%) in the MRD- pre-HSCT cohort and 48.5% ± 13.8% (95% CI: 20.9%–71.6%) in the MRD + pre-HSCT cohort (p = 0.001). Meanwhile, the 3-year EFS was 81.4% ± 7.6% (95% CI: 60.9%–91.9%) in the MRD- pre-HSCT cohort and 34.3% ± 13.3% (CI: 11.3%–59.2%) in the MRD + pre-HSCT cohort (p = 0.001). The estimated 3-year CIR rate was significantly lower (p = 0.001) in the MRD- pre-HSCT cohort (11.7% ± 6.4%, 95% CI: 2.8%–27.7%) than in the MRD + pre-HSCT cohort (59.0% ± 14.9%, 95% CI: 26.0%–81.4%) (Fig. 3).
Risk factors for relapse, OS and EFS
The univariate analyses revealed that MRD + at pre-HSCT, II–IV aGVHD, and one cycle to CR were significant factors affecting OS. MRD + at pre-HSCT, II–IV aGVHD, one cycle to CR, and central nervous system (CNS) infiltration were also significant factors that influenced EFS and CIR (Table 3).
In the multivariate analysis, MRD + at pre-HSCT was an independent risk factor for OS, EFS, and CIR. Meanwhile, III–IV aGVHD and one cycle to CR were independent risk factors for EFS (Table 4).
According to previous studies, the presence of MLL-r in AML is a poor prognostic predictor. Therefore, it is essential to evaluate the efficacy of allo-HSCT in such cases. According to the age distribution of MLL-r, most of the patients are infants (primarily acute lymphoblastic leukaemia) and young-to-middle-aged adults (primary AML) . Thus, most studies have focused on infants and adults. To the best of our knowledge, this study is one of the largest series of non-infant children with MLL-r AML treated with allo-HSCT. Our results demonstrate that allo-HSCT (especially haplo-HSCT) in CR1 may improve the prognosis of non-infant children with MLL-r AML, and pre-HSCT MRD status affected the outcomes significantly.
In adult patients with MLL-r AML, several studies have confirmed that allo-HSCT is more beneficial than chemotherapy alone [8, 9, 24]. In contrast, the effectiveness of HSCT remains controversial for paediatric patients with MLL-r AML. Balgobind et al.  have conducted the largest such study, which involved 756 paediatric patients. They reported that HSCT did not improve the prognosis. Miyamura et al.  reported that the 3-year OS and EFS of 90 paediatric patients with MLL-r AML after allo-HSCT were 52.1% and 46.7%, respectively. These values were significantly lower than the ~ 70% overall long-term survival in paediatric AML. However, Wang-Yu et al.  reported that 56 patients with MLL-r AML (10 children and 46 adults) who received allo-HSCT had a 3-year OS of 61.8%; the adults and children had comparable OSs and leukaemia-free survivals. In contrast, all the 29 patients who did not receive allo-HSCT relapsed. Therefore, these study findings imply that allo-HCT should be recommended for all patients with MLL-r AML in CR1. In our study, the 3-year OS of 74.5% and EFS of 64.1% for the 44 paediatric patients were higher than previously reported rates. Several factors may have contributed to these favourable outcomes. With the continuous advances in allo-HSCT, the long-term survival of paediatric patients with MLL-r after allo-HSCT is improving. In our study, most of the patients were treated in the last five years, which is different from prior studies that included patients from 15–20 years ago. Furthermore, recent studies have demonstrated that patients receiving HSCT in CR1 have a better prognosis than those beyond CR1 [9,10,11,12]. All the patients enrolled into our cohort had achieved CR1 at pre-HSCT, further increasing the long-term survival rates.
Numerous studies have shown that the presence of MRD at pre-HSCT has a very strong impact on outcomes [25,26,27]. A recent meta-analysis showed that being MRD + at pre-transplant was associated with worse LFS, OS, and CIR . Konuma et al.  assessed the MRD status of 109 patients with MLL-r AML at pre-HSCT, with a probability of a 3-year OS of 39% in the MRD + cohort and 64% in the MRD- cohort (P = 0.02). In fact, our research showed that MRD + patients at pre-HSCT had a worse survival and higher risk of relapse than the MRD- patients, and confirmed that pre-HSCT MRD + was an independent risk factor for OS, EFS, and CIR. Therefore, strategies to achieve an MRD-negative status at pre-HSCT are very necessary. MRD + patients at pre-HSCT tend to be relatively insensitive to chemotherapy. Extra consolidation therapy may not reverse an MRD-positive state into an MRD-negative state; however, it is associated with long-term adverse effects and a high rate of treatment-related mortality. In this era of targeted therapies, we expected to identify therapeutic agents that specifically target MLL fusion proteins and/or the downstream pathways these fusions dysregulate. Currently, inhibitors against the kinase P-TEFb (CDK9/CyclinT1) , histone methyltransferases DOT1L , and bromodomain and extra-terminal domain family of proteins  are undergoing clinical testing for AML, and inhibitors of the MENIN-MLL interaction have been described and are undergoing pre-clinical evaluation [33, 34]. Presently, whether MRD + patients at pre-HSCT should receive maintenance therapy after HSCT remains controversial. Given the high risk of disease recurrence, Yi Zhou et al.  suggested that MRD + patients at pre-HSCT should receive pre-emptive therapeutic strategies after HSCT. Accumulating evidence has confirmed that high-risk AML patients might benefit from maintenance therapy post-transplantation. The initiation of directed agents in patients with identified mutations (e.g., FLT3 and Philadelphia chromosome) prior to allo-HCT, have generally better post-HCT outcomes [35, 36]. Lei Gao et al.  reported that minimal-dose decitabine maintenance combined with recombinant human granulocyte colony stimulating factor after allo-HSCT can reduce the relapse rate in high-risk AML patients undergoing allo-HSCT, with a 2-year relapse rate of 15.0% and 38.3% in the intervention and non-intervention groups, respectively. Chapuis et al.  reported that 12 high-risk patients (MRD + pre-HSCT or high-risk cytogenetic/molecular features) received T cell receptor gene therapy targeting WT1 as post-transplant maintenance had a 100% relapse-free survival, while the control group of 88 patients had a 54% relapse-free survival (P = 0.002). However, the maintenance strategies may potentially increase the NRM risk because of residual toxicity from HCT, the fragility of the newly transplanted marrow and the existence of other transplant-related complications. Therefore, there is an urgent need to identify an effective and safe approach.
Notably, 37 patients (84.1%) in our cohort received haplo-HSCT. Previous studies showed that haplo-HSCT had a higher incidence of GVHD than HLA-matched transplants ; our results were in line with previous reports. However, haplo-HSCT also had certain strengths. Our previous study showed that the outcomes of haplo-HSCT are equivalent to those of MSDT and MUDT , and haplo-HSCT may even be superior in eradicating pre-transplantation MRD . Yu et al.  assessed 189 patients with high-risk AML who were divided into an HID cohort (n = 83) and MSD cohort (n = 106). The cumulative incidence of post-MRD + was significantly lower in the HID groups than in the MSD groups (18% vs. 42%, p < 0.001). It was considered that HID might have a stronger graft-versus-leukaemia effect than MSD. In our study, III-IV aGVHD was a poor prognostic factor for EFS, but with no observed significant difference in OS in the multivariate analysis. We speculated that the adverse effect of high GVHD may have been offset by the benefits of a stronger graft-versus-leukaemia effect of HID.
The major limitations of this study were its retrospective design, single-centre design, and limited sample size. Previous reports have indicated that AML with t(9,11) is associated with a better prognosis than other 11q23 abnormalities , and the expression of ecotropic viral integration site 1(EVI1) or fms-like tyrosine kinase 3-internal tandem duplication (FLT3-ITD) mutation was a poor prognostic factor [23, 43]. The factors in this study were not significant. This may be related to the small number of cases. Thus, our results need to be further verified in multi-centre and large-scale studies.
In conclusion, our study demonstrates the superior outcomes of HSCT for non-infant children with MLL-r AML and suggests that allo-HSCT (especially haplo-HSCT) in CR1 may improve the prognosis of these patients. Pre-HSCT MRD status was the most significant prognostic factor for relapse and survival. Therefore, allo-HSCT can be a viable strategy in these patients, and close monitoring of MRD at pre-HSCT is crucial.
Availability of data and materials
The datasets used and analysed during the current study are available from the corresponding authors on reasonable request.
Acute graft-versus-host disease
Allogeneic haematopoietic stem cell transplantation
Cumulative incidence of relapse
Cumulative incidence of relapse
Central nervous system
Ecotropic viral integration site 1
Fluorescence in situ hybridisation
Fms-like tyrosine kinase 3-internal tandem duplication
Human leukocyte antigen
Minimal residual disease
Mixed-lineage leukaemia rearrangement
Matched sibling donor transplant
Matched unrelated donor transplant
Quantitative real-time polymerase chain reaction
Gamis AS, Alonzo TA, Perentesis JP, Meshinchi S. Children’s Oncology Group’s 2013 blueprint for research: acute myeloid leukemia. Pediatr Blood Cancer. 2013;60(6):964–71.
De Moerloose B, Reedijk A, de Bock GH, Lammens T, de Haas V, Denys B, et al. Response-guided chemotherapy for pediatric acute myeloid leukemia without hematopoietic stem cell transplantation in first complete remission: Results from protocol DB AML-01. Pediatr Blood Cancer. 2019;66(5): e27605.
Taga T, Tomizawa D, Takahashi H, Adachi S. Acute myeloid leukemia in children: Current status and future directions. Pediatr Int. 2016;58(2):71–80.
Creutzig U, van den Heuvel-Eibrink MM, Gibson B, Dworzak MN, Adachi S, de Bont E, et al. Diagnosis and management of acute myeloid leukemia in children and adolescents: recommendations from an international expert panel. Blood. 2012;120(16):3187–205.
Balgobind BV, Zwaan CM, Pieters R, Van den Heuvel-Eibrink MM. The heterogeneity of pediatric MLL-rearranged acute myeloid leukemia. Leukemia. 2011;25(8):1239–48.
Balgobind BV, Raimondi SC, Harbott J, Zimmermann M, Alonzo TA, Auvrignon A, et al. Novel prognostic subgroups in childhood 11q23/MLL-rearranged acute myeloid leukemia: results of an international retrospective study. Blood. 2009;114(12):2489–96.
Döhner H, Estey E, Grimwade D, Amadori S, Appelbaum FR, Büchner T, et al. Diagnosis and management of AML in adults: 2017 ELN recommendations from an international expert panel. Blood. 2017;129(4):424–47.
Chen Y, Kantarjian H, Pierce S, Faderl S, O’Brien S, Qiao W, et al. Prognostic significance of 11q23 aberrations in adult acute myeloid leukemia and the role of allogeneic stem cell transplantation. Leukemia. 2013;27(4):836–42.
Pigneux A, Labopin M, Maertens J, Cordonnier C, Volin L, Socié G, et al. Outcome of allogeneic hematopoietic stem-cell transplantation for adult patients with AML and 11q23/MLL rearrangement (MLL-r AML). Leukemia. 2015;29(12):2375–81.
Wang Y, Liu QF, Qin YZ, Liu DH, Xu LP, Jiang B, et al. Improved outcome with hematopoietic stem cell transplantation in a poor prognostic subgroup of patients with mixed-lineage-leukemia-rearranged acute leukemia: Results from a prospective, multi-center study. Am J Hematol. 2014;89(2):130–6.
Miyamura T, Kudo K, Tabuchi K, Ishida H, Tomizawa D, Adachi S, et al. Hematopoietic stem cell transplantation for pediatric acute myeloid leukemia patients with KMT2A rearrangement; A nationwide retrospective analysis in Japan. Leuk Res. 2019;87: 106263.
Jaffe ES, Harris NL, Diebold J, Muller-Hermelink HK. World Health Organization classification of neoplastic diseases of the hematopoietic and lymphoid tissues. A progress report. Am J Clin Pathol. 1999;111(1 Suppl 1):S8–12.
Creutzig U, van den Heuvel-Eibrink MM, Gibson B, Dworzak MN, Adachi S, de Bont E, et al. Diagnosis and management of acute myeloid leukemia in children and adolescents: recommendations from an international expert panel. Blood. 2012;120(16):3187–205.
Elgarten CW, Aplenc R. Pediatric acute myeloid leukemia: updates on biology, risk stratification, and therapy. Curr Opin Pediatr. 2020;32(1):57–66.
Bai L, Cheng YF, Lu AD, Suo P, Wang Y, Zuo YX, et al. Prognosis of haploidentical hematopoietic stem cell transplantation in non-infant children with t(v;11q23)/MLL-rearranged B-cell acute lymphoblastic leukemia. Leuk Res. 2020;91: 106333.
Meyer C, Burmeister T, Groger D, Tsaur G, Fechina L, Renneville A, et al. The MLL recombinome of acute leukemias in 2017. Leukemia. 2018;32(2):273–84.
Lisa G. Shaffer JM-J, Michael Schmid. ISCN 2013: An International System for Human Cytogenetic Nomenclature (2013). Basel, Switzerland: S. Karger AG; 2013.
Hu GH, Cheng YF, Lu AD, Wang Y, Zuo YX, Yan CH, et al. Allogeneic hematopoietic stem cell transplantation can improve the prognosis of high-risk pediatric t(8;21) acute myeloid leukemia in first remission based on MRD-guided treatment. BMC Cancer. 2020;20(1):553.
Chen H, Liu KY, Xu LP, Chen YH, Zhang XH, Wang Y, et al. Haploidentical hematopoietic stem cell transplantation for pediatric Philadelphia chromosome-positive acute lymphoblastic leukemia in the imatinib era. Leuk Res. 2017;59:136–41.
Sun YQ, Chang YJ, Huang XJ. Update on current research into haploidentical hematopoietic stem cell transplantation. Expert Rev Hematol. 2018;11(4):273–84.
Przepiorka, Weisdorf D, Martin P, et al. 1994 Consensus Conference on Acute GVHD Grading. Bone Marrow Transplant. 1995;15(6):825–8.
Filipovich AH, Weisdorf D, Pavletic S, et al. National Institutes of Health consensus development project on criteria for clinical trials inchronic graft-versus-host disease: I. Diagnosis andstaging working group report. Biol Blood Marrow Transplant. 2005;11:945–56.
Winters AC, Bernt KM. MLL-Rearranged Leukemias-An Update on Science and Clinical Approaches. Front Pediatr. 2017;5:4.
Yang H, Huang S, Zhu CY, Gao L, Zhu HY, Lv N, et al. The Superiority of Allogeneic Hematopoietic Stem Cell Transplantation Over Chemotherapy Alone in the Treatment of Acute Myeloid Leukemia Patients with Mixed Lineage Leukemia (MLL) Rearrangements. Med Sci Monit. 2016;22:2315–23.
Walter RB, Gooley TA, Wood BL, Milano F, Fang M, Sorror ML, et al. Impact of pretransplantation minimal residual disease, as detected by multiparametric flow cytometry, on outcome of myeloablative hematopoietic cell transplantation for acute myeloid leukemia. J Clin Oncol. 2011;29(9):1190–7.
Zhou Y, Othus M, Araki D, Wood BL, Radich JP, Halpern AB, et al. Pre- and post-transplant quantification of measurable ('minimal’) residual disease via multiparameter flow cytometry in adult acute myeloid leukemia. Leukemia. 2016;30(7):1456–64. https://doi.org/10.1038/leu.2016.46.
Araki D, Wood BL, Othus M, Radich JP, Halpern AB, Zhou Y, et al. Allogeneic Hematopoietic Cell Transplantation for Acute Myeloid Leukemia: Time to Move Toward a Minimal Residual Disease-Based Definition of Complete Remission? J Clin Oncol. 2016;34(4):329–36.
Buckley SA, Wood BL, Othus M, Hourigan CS, Ustun C, Linden MA, et al. Minimal residual disease prior to allogeneic hematopoietic cell transplantation in acute myeloid leukemia: a meta-analysis. Haematologica. 2017;102(5):865–73.
Konuma T, Mizuno S, Kondo T, Yamaguchi H, Fukuda T, Uchida N, et al. Allogeneic hematopoietic cell transplantation in adult acute myeloid leukemia with 11q23 abnormality: a retrospective study of the Adult Acute Myeloid Leukemia Working Group of the Japan Society for Hematopoietic Cell Transplantation (JSHCT). Ann Hematol. 2018;97(11):2173–83.
Boffo S, Damato A, Alfano L, Giordano A. CDK9 inhibitors in acute myeloid leukemia. J Exp Clin Cancer Res. 2018;37(1):36.
Stein EM, Garcia-Manero G, Rizzieri DA, Tibes R, Berdeja JG, Savona MR, et al. The DOT1L inhibitor pinometostat reduces H3K79 methylation and has modest clinical activity in adult acute leukemia. Blood. 2018;131(24):2661–9.
Braun T, Gardin C. Investigational BET bromodomain protein inhibitors in early stage clinical trials for acute myelogenous leukemia (AML). Expert Opin Investig Drugs. 2017;26(7):803–11.
Krivtsov AV, Evans K, Gadrey JY, Eschle BK, Hatton C, Uckelmann HJ, et al. A Menin-MLL Inhibitor Induces Specific Chromatin Changes and Eradicates Disease in Models of MLL-Rearranged Leukemia. Cancer Cell. 2019;36(6):660-673.e11.
Borkin D, He S, Miao H, Kempinska K, Pollock J, Chase J, et al. Pharmacologic inhibition of the Menin-MLL interaction blocks progression of MLL leukemia in vivo. Cancer Cell. 2015;27(4):589–602.
Xuan L, Liu Q. Maintenance therapy in acute myeloid leukemia after allogeneic hematopoietic stem cell transplantation. J Hematol Oncol. 2021;14(1):4.
Culos KA, Gatwood KS, Byrne M. Maintenance Strategies After Hematopoietic Cell Transplantation. Pharmacotherapy. 2020;40(8):727–40.
Gao L, Zhang Y, Wang S, Kong P, Su Y, Hu J, et al. Effect of rhG-CSF Combined With Decitabine Prophylaxis on Relapse of Patients With High-Risk MRD-Negative AML After HSCT: An Open-Label, Multicenter. Randomized Controlled Trial J Clin Oncol. 2020;38(36):4249–59.
Chapuis AG, Egan DN, Bar M, Schmitt TM, McAfee MS, Paulson KG, et al. T cell receptor gene therapy targeting WT1 prevents acute myeloid leukemia relapse post-transplant. Nat Med. 2019;25(7):1064–72.
Zheng FM, Zhang X, Li CF, Cheng YF, Gao L, He YL, et al. Haploidentical- versus identical-sibling transplant for high-risk pediatric AML: A multi-center study. Cancer Commun (Lond). 2020;40(2–3):93–104.
Han LJ, Wang Y, Fan ZP, Huang F, Zhou J, Fu YW, et al. Haploidentical transplantation compared with matched sibling and unrelated donor transplantation for adults with standard-risk acute lymphoblastic leukaemia in first complete remission. Br J Haematol. 2017;179(1):120–30.
Chang YJ, Wang Y, Liu YR, Xu LP, Zhang XH, Chen H, et al. Haploidentical allograft is superior to matched sibling donor allograft in eradicating pre-transplantation minimal residual disease of AML patients as determined by multiparameter flow cytometry: a retrospective and prospective analysis. J Hematol Oncol. 2017;10(1):134.
Yu S, Huang F, Wang Y, Xu Y, Yang T, Fan Z, et al. Haploidentical transplantation might have superior graft-versus-leukemia effect than HLA-matched sibling transplantation for high-risk acute myeloid leukemia in first complete remission: a prospective multicentre cohort study. Leukemia. 2020;34(5):1433–43.
Jiang S, Fan Y, Fang Y, Hou C, Chen J, Cen J, et al. The role of EVI1 gene quantification in AML patients with 11q23/MLL rearrangement after allogeneic hematopoietic stem cell transplantation. Bone Marrow Transplant. 2020.
We thank Editage (www.editage.cn) for her linguistic assistance and scientific consultation during the preparation of this manuscript.
The Research reported in this publication was supported by CAMS Innovation Fund for Medical Sciences (CIFMS) (grant number: 2019-I2M-5–034) and the 2018 Beijing Municipal Key Clinical Specialty Construction Project-Pediatrics (No. 2199000726).
Ethics approval and consent to participate
This clinical study was approved by the Ethics Committee of Peking University People’s Hospital and was carried out in accordance with the Declaration of Helsinki. Written informed consent for participation was obtained from the parents/guardians of all the patients.
Consent for publication
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
About this article
Cite this article
Bai, L., Zhang, Yz., Yan, Ch. et al. Outcomes of allogeneic haematopoietic stem cell transplantation for paediatric patients with MLL-rearranged acute myeloid leukaemia. BMC Cancer 22, 896 (2022). https://doi.org/10.1186/s12885-022-09978-3
- MLL rearrangement
- Paediatric patient
- Acute myeloid leukaemia
- Haploidentical haematopoietic stem cell transplantation