lunes, 26 de agosto de 2019

Childhood Acute Lymphoblastic Leukemia Treatment (PDQ®) 1/8 –Health Professional Version - National Cancer Institute

Childhood Acute Lymphoblastic Leukemia Treatment (PDQ®)–Health Professional Version - National Cancer Institute

National Cancer Institute



Childhood Acute Lymphoblastic Leukemia Treatment (PDQ®)–Health Professional Version

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General Information About Childhood Acute Lymphoblastic Leukemia (ALL)

Cancer in children and adolescents is rare, although the overall incidence of childhood cancer, including ALL, has been slowly increasing since 1975.[1] Dramatic improvements in survival have been achieved in children and adolescents with cancer.[1-3] Between 1975 and 2010, childhood cancer mortality decreased by more than 50%.[1-3] For ALL, the 5-year survival rate has increased over the same time from 60% to approximately 90% for children younger than 15 years and from 28% to more than 75% for adolescents aged 15 to 19 years.[4] Childhood and adolescent cancer survivors require close monitoring because cancer therapy side effects may persist or develop months or years after treatment. (Refer to the PDQ summary on Late Effects of Treatment for Childhood Cancer for specific information about the incidence, type, and monitoring of late effects in childhood and adolescent cancer survivors.)

Incidence

ALL is the most common cancer diagnosed in children and represents approximately 25% of cancer diagnoses among children younger than 15 years.[2,3] In the United States, ALL occurs at an annual rate of approximately 41 cases per 1 million people aged 0 to 14 years and approximately 17 cases per 1 million people aged 15 to 19 years.[4] There are approximately 3,100 children and adolescents younger than 20 years diagnosed with ALL each year in the United States.[5] Since 1975, there has been a gradual increase in the incidence of ALL.[4,6]
A sharp peak in ALL incidence is observed among children aged 2 to 3 years (>90 cases per 1 million per year), with rates decreasing to fewer than 30 cases per 1 million by age 8 years.[2,3] The incidence of ALL among children aged 2 to 3 years is approximately fourfold greater than that for infants and is likewise fourfold to fivefold greater than that for children aged 10 years and older.[2,3]
The incidence of ALL appears to be highest in Hispanic children (43 cases per 1 million).[2,3,7,8] The incidence is substantially higher in white children than in black children, with a nearly threefold higher incidence of ALL from age 2 to 3 years in white children than in black children.[2,3,7]

Anatomy

Childhood ALL originates in the T and B lymphoblasts in the bone marrow (refer to Figure 1).
ENLARGEBlood cell development; drawing shows the steps a blood stem cell goes through to become a red blood cell, platelet, or white blood cell. A myeloid stem cell becomes a red blood cell, a platelet, or a myeloblast, which then becomes a granulocyte (the types of granulocytes are eosinophils, basophils, and neutrophils). A lymphoid stem cell becomes a lymphoblast and then becomes a B-lymphocyte, T-lymphocyte, or natural killer cell.
Figure 1. Blood cell development. Different blood and immune cell lineages, including T and B lymphocytes, differentiate from a common blood stem cell.
Marrow involvement of acute leukemia as seen by light microscopy is defined as follows:
  • M1: Fewer than 5% blast cells.
  • M2: 5% to 25% blast cells.
  • M3: Greater than 25% blast cells.
Almost all patients with ALL present with an M3 marrow.

Risk Factors for Developing ALL

Few factors associated with an increased risk of ALL have been identified. The primary accepted risk factors for ALL and associated genes (when relevant) include the following:
  • Prenatal exposure to x-rays.
  • Postnatal exposure to high doses of radiation (e.g., therapeutic radiation as previously used for conditions such as tinea capitis and thymus enlargement).
  • Previous treatment with chemotherapy.
  • Genetic conditions that include the following:
    • Down syndrome. (Refer to the Down syndrome section of this summary for more information.)
    • Neurofibromatosis (NF1).[9]
    • Bloom syndrome (BLM).[10]
    • Fanconi anemia (multiple genes; ALL is observed much less frequently than acute myeloid leukemia [AML]).[11]
    • Ataxia telangiectasia (ATM).[12]
    • Li-Fraumeni syndrome (TP53).[13-15]
    • Constitutional mismatch repair deficiency (biallelic mutation of MLH1, MSH2, MSH6, and PMS2).[16,17]
  • Low- and high-penetrance inherited genetic variants.[18] (Refer to the Low- and high-penetrance inherited genetic variants section of this summary for more information.)
  • Carriers of a constitutional Robertsonian translocation that involves chromosomes 15 and 21 are specifically and highly predisposed to developing iAMP21 ALL.[19]

Down syndrome

Children with Down syndrome have an increased risk of developing both ALL and AML,[20,21] with a cumulative risk of developing leukemia of approximately 2.1% by age 5 years and 2.7% by age 30 years.[20,21]
Approximately one-half to two-thirds of cases of acute leukemia in children with Down syndrome are ALL, and about 2% to 3% of childhood ALL cases occur in children with Down syndrome.[22-24] While the vast majority of cases of AML in children with Down syndrome occur before the age of 4 years (median age, 1 year),[25] ALL in children with Down syndrome has an age distribution similar to that of ALL in non–Down syndrome children, with a median age of 3 to 4 years.[22,23]
Patients with ALL and Down syndrome have a lower incidence of both favorable (t(12;21)(p13;q22)/ETV6-RUNX1 [TEL-AML1] and hyperdiploidy [51–65 chromosomes]) and unfavorable (t(9;22)(q34;q11.2) or t(4;11)(q21;q23) and hypodiploidy [<44 chromosomes]) cytogenetic findings and a near absence of T-cell phenotype.[22-26]
Approximately 50% to 60% of cases of ALL in children with Down syndrome have genomic alterations affecting CRLF2 that generally result in overexpression of the protein produced by this gene, which dimerizes with the interleukin-7 receptor alpha to form the receptor for the cytokine thymic stromal lymphopoietin.[27-29] CRLF2 genomic alterations are observed at a much lower frequency (<10%) in children with precursor B-cell ALL who do not have Down syndrome.[29-31] Based on the relatively small number of published series, it does not appear that genomic CRLF2 aberrations in patients with Down syndrome and ALL have prognostic relevance.[26,28] However, IKZF1 gene deletions, observed in up to 35% of patients with Down syndrome and ALL, have been associated with a significantly worse outcome in this group of patients.[28,32]
Approximately 20% of ALL cases arising in children with Down syndrome have somatically acquired JAK2 mutations,[27,28,33-35] a finding that is uncommon among younger children with ALL but that is observed in a subset of primarily older children and adolescents with high-risk precursor B-cell ALL.[36] Almost all Down syndrome ALL cases with JAK2mutations also have CRLF2 genomic alterations.[27-29] Preliminary evidence suggests no correlation between JAK2 mutation status and 5-year event-free survival in children with Down syndrome and ALL,[28,34] but more study is needed to address this issue, as well as the prognostic significance of CRLF2 alterations and IKZF1 gene deletions in this patient population.

Low- and high-penetrance inherited genetic variants

Genetic predisposition to ALL can be divided into several broad categories, as follows:
  • Association with genetic syndromes. Increased risk can be associated with the genetic syndromes listed above in which ALL is observed, although it is not the primary manifestation of the condition.
  • Common alleles. Another category for genetic predisposition includes common alleles with relatively small effect sizes that are identified by genome-wide association studies. Genome-wide association studies have identified a number of germline (inherited) genetic polymorphisms that are associated with the development of childhood ALL.[18] For example, the risk alleles of ARID5B are associated with the development of hyperdiploid (51–65 chromosomes) precursor B-cell ALL. ARID5B is a gene that encodes a transcriptional factor important in embryonic development, cell type–specific gene expression, and cell growth regulation.[37,38] Other genes with polymorphisms associated with increased risk of ALL include GATA3,[39] IKZF1,[37,38,40] CDKN2A,[41] CDKN2B,[40,41] CEBPE,[37] PIP4K2A,[39,42] and TP63.[43]
  • Rare germline variants with high penetrance. A germline variant in PAX5 that substitutes serine for glycine at amino acid 183 and that reduces PAX5 activity has been identified in several families that experienced multiple cases of ALL.[44,45] Similarly, several germline ETV6 variants that lead to loss of ETV6 function have been identified in kindreds affected by both thrombocytopenia and ALL.[46-48] Sequencing of ETV6 in remission (i.e., germline) specimens identified variants that were potentially related to ALL in approximately 1% of children with ALL that were evaluated.[46] This suggests a previously unrecognized contribution to ALL risk that will need to be assessed in future studies.[46-48]
    Rare, pathogenic germline TP53 variants are associated with an increased risk of ALL.[49] A study of 3,801 children with ALL observed that 26 patients (0.7%) had a pathogenic TP53 germline variant, with an associated odds ratio of 5.2 for ALL development.[49] Compared with ALL in children with TP53 wild-type status or TP53variants of unknown significance, ALL in children with pathogenic germline TP53variants was associated with older age at diagnosis (15.5 years vs. 7.3 years), hypodiploidy (65% vs. 1%), inferior event-free survival and overall survival, and a higher risk of second cancers.

Prenatal origin of childhood ALL

Development of ALL is in most cases a multistep process, with more than one genomic alteration required for frank leukemia to develop. In at least some cases of childhood ALL, the initial genomic alteration appears to occur in utero. Evidence to support this comes from the observation that the immunoglobulin or T-cell receptor antigen rearrangements that are unique to each patient’s leukemia cells can be detected in blood samples obtained at birth.[50,51] Similarly, in ALL characterized by specific chromosomal abnormalities, some patients have blood cells that carry at least one leukemic genomic abnormality at the time of birth, with additional cooperative genomic changes acquired postnatally.[50-52] Genomic studies of identical twins with concordant leukemia further support the prenatal origin of some leukemias.[50,53]
Evidence also exists that some children who never develop ALL are born with very rare blood cells carrying a genomic alteration associated with ALL. For example, in one study, 1% of neonatal blood spots (Guthrie cards) tested positive for the ETV6-RUNX1translocation, far exceeding the number of cases of ETV6-RUNX1 ALL in children.[54] Other reports confirm [55] or do not confirm [56,57] this finding, and methodological issues related to fluorescence in situ hybridization testing complicate interpretation of the initial 1% estimate.[58]

Clinical Presentation

The typical and atypical symptoms and clinical findings of childhood ALL have been published.[59-61]

Diagnosis

The diagnostic evaluation needed to definitively diagnose childhood ALL has been published.[59-63]

Overall Outcome for ALL

Among children with ALL, approximately 98% attain remission, and approximately 85% of patients aged 1 to 18 years with newly diagnosed ALL treated on current regimens are expected to be long-term event-free survivors, with over 90% surviving at 5 years.[64-67]
Despite the treatment advances in childhood ALL, numerous important biologic and therapeutic questions remain to be answered before the goal of curing every child with ALL with the least associated toxicity can be achieved. The systematic investigation of these issues requires large clinical trials, and the opportunity to participate in these trials is offered to most patients and families.
Clinical trials for children and adolescents with ALL are generally designed to compare therapy that is currently accepted as standard with investigational regimens that seek to improve cure rates and/or decrease toxicity. In certain trials in which the cure rate for the patient group is very high, therapy reduction questions may be asked. Much of the progress made in identifying curative therapies for childhood ALL and other childhood cancers has been achieved through investigator-driven discovery and tested in carefully randomized, controlled, multi-institutional clinical trials. Information about ongoing clinical trials is available from the NCI website.

Current Clinical Trials

Use our advanced clinical trial search to find NCI-supported cancer clinical trials that are now enrolling patients. The search can be narrowed by location of the trial, type of treatment, name of the drug, and other criteria. General information about clinical trials is also available.
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