SPECIAL ARTICLE
Bone marrow transplantation and acute myeloid leukemia: Brazilian guidelines
Lucia Mariano da Rocha SillaI; Frederico DulleyII; Rosaura SaboyaII; Eduardo PatonIII; Fabio KerbauyIV; Adriano de Moraes ArantesV; Nelson HamerschlakVI
IHospital de Clínicas de Porto Alegre - HCPA, Porto Alegre, RS, Brazil
IIHospital das Clínicas, Faculdade de Medicina, Universidade de São Paulo - USP, São Paulo, SP, Brazil
IIIHospital de Câncer de Barretos, Barretos, SP, Brazil
IVUniversidade Federal de São Paulo - UNIFESP, São Paulo, SP, Brazil
VHospital Araújo Jorge - HAJ, Goiânia, GO, Brazil
VIHospital Israelita Albert Einstein - HIAE, São Paulo, SP, Brazil
Corresponding author Corresponding author: Nelson Hamerschlak Hospital Israelita Albert Einstein Av Albert Einstein 627 sala 1203 Morumbi 05651-901 - São Paulo, SP, Brazil Phone 55 11 3747-3203 hamer@einstein.br
Introduction
This report aims to define guidelines for the indication of hematopoietic stem cell transplantation in the treatment of acute myeloid leukemia in Brazil. This report on the role of hematopoietic stem cell transplantation in the treatment of acute myeloid leukemia was presented to and ratified by the Brazilian Bone Marrow Transplantation Society at the meeting on the Brazilian Guidelines for hematopoietic stem cell transplantation. This consensus is based on a review of the international literature and on the Brazilian experience in hematopoietic stem cell transplantation. The optimal treatment for acute myeloid leukemia in first complete remission is not yet defined. There is a consensus on the indication of allogeneic transplantation with myeloablative conditioning for patients presenting cytogenetic changes considered high risk. Allogeneic transplantation is not indicated in first complete remission for patients with low cytogenetic risk, and it appears that allogeneic transplantation, autologous transplantation, and consolidation chemotherapy are equivalent for patients with intermediate risk. In advanced disease and secondary leukemia, allogeneic transplant is the main therapeutic tool. New medications and therapeutic regimens have enabled the adoption of transplant in older individuals.
Prevalence and mortality rates of acute myeloid leukemia
Acute myeloid leukemia (AML) accounts for 90% of all cases of acute leukemia in adults,with an average age at diagnosis of 63 years(1). In the United States, 18,000 new cases of leukemia are diagnosed each year; 12,000 of which are acute(2,3). In the state of Rio Grande do Sul, Brazil, ahundred new cases of relapsed AML are diagnosed annually in patients of all ages, with an incidence of 0.5-1:100,000 people and an average age at diagnosis of 42 years. Seventy-nine per cent of casesof relapsed AML occur in adults (> 18 years). After five years, only 90 patients (17%) of the 532 patients diagnosed between 1996 and 2000 were still alive(4). These data are in accordance with the data in the literature, and suggest that outside clinical trials, and despite the advancement of knowledge in this field, AML is still a fatal disease in the vast majority of the cases. Estimates of the Brazilian Instituto Nacional do Câncer (Inca) indicate that the number of new cases of leukemia in Brazil in 2012 will be 4570 in males and 3940 in females, with a risk of five new cases per 100,000 men and four per 100,000 women(5). But in Brazil, just as there is a lack of specific data on each type of leukemia worldwide(3), the database of the National Health Service, DATASUS, only gathers information on the incidence and mortality for 'leukemia' in general, and does not specifically differentiate acute myeloid leukemia. For leukemia in general, the mortality rate in 2010 ranged from 1.20 (Amapá) to 4.08 (Rio Grande do Sul) per 100,000 female patients with leukemia and from 0.81(Acre) to 5.28 (Rio Grande do Sul) per 100,000 male patients(6). Meanwhile, DATASUS recorded 5935 deaths from leukemia in Brazil in 2010(7). It is likely that the Brazilian data are underestimated.
Hematopoietic stem cell transplantation and acute myeloid leukemia
AML is currently the most common indication for hematopoietic stem cell transplantation (HSCT) worldwide(8). The rationale for the indication of HSCT is based on the fact that this disease is the result of the accumulation of cells produced by extremely rare malignant stem cells, which are capable of self-renewing(9) and resistant to the cytotoxic effects of chemotherapy(10), resulting in disease relapse. Due to the resistance to chemotherapy, the malignant stem cell can undergo additional mutations(11) and is destroyed in a small number of patients, even in those who undergo doses of myeloablative chemotherapy or radiation administered for HSCT. The benefits of allogeneic HSCT derive from the destruction of these stem cells by the donor's immune system [T and natural killer (NK) lymphocytes], the graft-versus-leukemia effect(12,13).
Issues related to the disease and the patient greatly influence the endpoints of HSCT for AML. It has recently been systematically shown that the presence of comorbidities greatly compromises the results of HSCT, as a result of which this therapeutic option is not recommended for patients with high comorbidity burdens(14). Therefore, for the elderly, as described below, in patients with low comorbidity burdens or no comorbidities at all, the results of HSCT may be similar to those observed in young patients who receive this therapeutic option.
Results of hematopoietic stem cell transplantation for acute myeloid leukemia - international report
Allogeneic HSCT, a treatment for AML but which is accompanied by considerable morbimortality, is available to few patients due to age, lack of donors or unavailable hospital beds. Data from the Center of International Blood and Marrow Transplant Research (CIBMTR) show that until 2009, around 20,234 cases of AML were transplanted according to all hospitals that reported this data. Of these, around 52% underwent allogeneic HSCT from related donors and 48% from unrelated donors(15). According to Appelbaun(16), of the 13,000 new cases of AML annually reported in the United States, considering transplant hospitals that are not members of the CIBMTR, no more than 2000 patients have the chance of undergoing HSCT. However, the availability for unrelated donors has increased with the use of allogeneic transplantation, especially in patients between the ages of 40 to 65 years. In the literature, half of the donors for transplantation in first complete remission (CR1) are unrelated and in later stages of the disease,unrelated donors are more frequently used(3).
The results of related allogeneic HSCT with a myeloablative regimen for AML depend, above all, on the stage of the disease, early (CR1), intermediate (> second CR) or advanced (relapsed or refractory), with survival rates of around 53%, 44% and 20% in 5 years, respectively; while for myeloablative HSCT from unrelated donors, survival is around 40% in the early and intermediate stages, and 18% in the advanced stage, over the same period of time(15). The data on HSCT for AML reported by Brazilian hospitals to the CIBMTR are, overall, very similar to those published. However, it is important to point out that not all cases of AML in CR1 are indicated for HSCT (see below).
Risk factors
In addition to risk factors related to the stage of the disease and the presence of comorbidities, the classification of risk according to cytogenetic changes as proposed by the South West Oncology Group (SWOG)(17) and the Medical Research Council (MRC) AML 10 Trial(18) (Table 1) is essential to define treatment for the different sub-types of AML. A series of molecular changes has been associated with AML and trials have been carried out to better define their prognostic role (Table 2)(12,19-22).
Indication of allogeneic hematopoietic stem cell transplantation for acute myeloid leukemia in first complete remission
A recently published meta-analysis, which included 6700 patients enrolled in prospective trials on HSCT for AML in CR1, showed that the results for related allogeneic HSCT with high doses of chemotherapy are higher than for autologous HSCT in high- and intermediate-risk patients. Allogeneic HSCT is not indicated for low risk patients(23). Low-risk patients (Table 1), with core binding factor (CBF) leukemia, CBF-AML [(8;21), inv(16) or t(16;16)] or acute progranulocytic leukemia [t(15-17)] have a moderate risk of relapse and around 50% of survival in 5 years when they undergo only chemotherapy(24).
Indications of autologous hematopoietic stem cell transplantation for acute myeloid leukemia in first complete remission
Although successive meta-analyses have demonstrated the non-superiority of autologous HSCT over high dose chemotherapy(25-27), experience in Brazil in the treatment of AML seems to suggest a role for autologous HSCT (28). Between 1996 and 2000, the five-year survival rate for the 532 patients with AML was 17%(4). However, it is important to point out that in this study, the surviving patients and those in CR after 5 years included, thoughfew in number, patients who had undergone allogeneic HSCT and patients in palliative care or untreated. However, in a retrospective study on the results of allogeneic and autologous HSCT for AML in Brazil(29), there were no differences for overall survival (OS) between these two types of transplantations. Therefore, in Brazil, autologous HSCT is an accepted procedure of consolidation therapyfor AML, after two rounds of induction and at least one round ofconsolidation therapy, for intermediate-risk patients without any HLA-compatible donor. In low-risk patients [without the c-KIT mutation and in the presence of Nucleophosmin 1 (NPM1)], chemotherapy is only recommended at high doses and allogeneic or autologous HSCT is not indicated. In cases of unfavorable cytogenetics, allogeneic HSCT is preferable and should be indicated whenever possible. For AML-M3 in molecular second complete remission (CR2), autologous HSCT is acceptable(30).
Consolidation therapy and hematopoietic stem cell transplantation
The number of consolidation therapies prior to an allogeneic HSCT has never been investigated prospectively. A CIBMTR retrospective study involving 431 patients suggests that additional chemotherapy after CR is not beneficial and allogeneic HSCT should be performed as soon as possible(31). For autologous HSCT, as mentioned above, in Brazil, at least one round of consolidation therapy is recommended prior to transplantation(28).
Bone marrow or peripheral blood transplant
In a meta-analysis of nine randomized studies that included 1111 patients, it was demonstrated that peripheral blood (PB) HSCT is superior to bone marrow (BM) HSCT as it results in a reduced relapse rate, improved OS and improved disease-free survival (DFS)(32). However, it is important to high light that PB HSCT is associated with a significant risk of extensive graft-versus-host disease (GVHD), particularly in unrelated HSCT(33) and should be reserved for patients with advanced disease (> CR2)(34).
Therapeutic regimens
The comparison between busulfan (Bu) + cyclophosphamide (CY) and Bu + total body irradiation (TBI) administered to 581 patients (381 administered with Bu-CY and 200 with Bu-TBI) showed that, although Bu-TBI seems to be related to reduced relapse, significant differences were not observed for transplanted-related mortality (TRM), DFS and OS(35). More recently, the fludarabine (Flu) + Bu association has been used and seems to be associated with less toxicity and efficacy similar to Bu-CY in a retrospective comparison(36). Although promising and similar results to this therapeutic regimen were observed in Brazil by Conexão Caipira collaborative group(37), it is important to emphasize that the original protocol was designed for the use of intravenous Bu (Flu 30 mg/m2, Bu 1 mg/kg x 16 doses orally, target Bu). Based on this evidence, it is acceptable in Brazil(28) to use three therapeutic options, Bu-CY/Bu-melphalan (Mel), Flu-Bu and Bu-TBI, depending on the treatment center's experience in each option and availability.
Unrelated allogeneic hematopoietic stem cell transplantation
With the exception of one trial that involved a small number of patients(38), there have been no prospective studies comparing unrelated and related allogeneic HSCT. The results of retrospective analysis suggest that unrelated allogeneic HSCT is an option for patients who do not have HLA-compatible related donors. With more sensitive molecular techniques for HLA typing, the results for unrelated HSCT seem to be similar to those of related HSCT in high-risk AML patients(39).
In a retrospective study reported by the CIBMTR involving 2223 patients who underwent related and unrelated HSCT, although a higher incidence of acute Grade II-IV GVHD was observed in the unrelated transplanted patients, transplant-related mortality (TRM) and OS were similar between the two identical HLA groups (8:8)(40). As for the origin of the cells, the results seem to be similar between unrelated BM and umbilical cord blood donors(41).
Hematopoietic stem cell transplantation in relapsed or refractory acute myeloid leukemia
Allogeneic HSCT is accepted in the treatment of refractoryAML(42). In one publication, the three-year survival rate for 1673transplanted patients with relapsed or refractory AML was 19%(43). Nevertheless, in the late relapsed sub-group, without blasts in the peripheral blood, with performance status > 90%, and favorable cytogenetics and who received grafts from related HLA-compatible donors, the three-year survival rate was 43%. Approximately 30% of patients who were prematurely transplanted during relapse (i.e., < 30% of blasts in the BM) had disease-free survival similar to patients transplanted in CR2(44). Although the diffe rence between relapsed or refractory AML is not clear in the literature, HSCT can be an option for this group of patients.
Hematopoietic stem cell transplantation in the elderly
The median age of patients with AML/myelodysplastic syndrome (MDS) is 65 years(45). The number of patients with long-term survival is very low, regardless of the choice of chemotherapeutic regimen used for remission induction or consolidation(46,47). Historically, myeloablative transplant in the elderly has been performed little and this is associated with an extremely high mortality rate associated with the therapeutic regimen(48). It has become clear that age per se is not an obstacle for HSCT(49), since comorbidities and performance status exceed age in the determination of the risk of transplant-related mortality. A two year survival of 68% was observed in a study by MD Anderson involving patients treated at the Hospital Israelita Albert Einstein (HIAE) in Brazil(50). Based on the comparative study between intravenous Bu and Flu, and Bu and Cy, which demonstrated improved OS, leukemia-free survival and reduced toxicity in patients with AML in the Bu-Flu group, 79 patients aged between 60 and 80 years with AML and MDS were investigated. These data confirm that provided that patients have a good performance status, the use of therapy with Bu-Flu - using Bu intravenously - can be beneficial. HSCT with reduced therapy or reduced toxicity is today a well-established treatment for elderly patients with AML(51).
Final recommendations
To improve the results and corroborate with the various types of HSCT for the treatment of AML in Brazil, a national effort should be made for quality karyotyping, and for the development of molecular techniques to be used as tools in the classification of risk and to categorize the ideal treatment for AML.
To summarize, the consensus and the respective qualitydeterminations of evidence and strength of recommendation were:
- Allogeneic HSCT is recommended for high-risk AML (A1).
- Allogeneic HSCT is recommended for intermediate-risk AML (B2).
- Allogeneic HSCT is recommended for relapsed/refractory AML (C2).
- Autologous HSCT is recommended for AML after consolidation therapy (B2).
- Autologous HSCT is recommended for AML in CR1; this is preferable to chemotherapy in the Brazilian experience(C2).
- Autologous HSCT is accepted for AML-M3 in molecular CR2 (C2).
-PB stem cells are a more common source than BM in advanced disease (B1).
-The recommended therapeutic regimens include: Bu-Cy/Bu-Mel, Flu-Bu and TBI-Cy, TBI-Cy. For umbilical cord cases, antithymocyte globulin (ATG) regimens should be considered (B1).
-Allogeneic HSCT for the treatment of AML can be used in patients aged between 60 and 80 years with good performance status and absence of significant comorbidities.
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Submitted: 11/21/2012
Accepted: 12/11/2012
Conflict-of-interest disclosure: The authors declare no competing financial interest
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Publication in this collection
05 Apr 2013 -
Date of issue
2013