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Genomic determinants of long-term cardiometabolic complications in childhood acute lymphoblastic leukemia survivors

BMC Cancer volume 17, Article number: 751 (2017) Cite this article

Abstract

Background

While cure rates for childhood acute lymphoblastic leukemia (cALL) now exceed 80%, over 60% of survivors will face treatment-related long-term sequelae, including cardiometabolic complications such as obesity, insulin resistance, dyslipidemia and hypertension. Although genetic susceptibility contributes to the development of these problems, there are very few studies that have so far addressed this issue in a cALL survivorship context.

Methods

In this study, we aimed at evaluating the associations between common and rare genetic variants and long-term cardiometabolic complications in survivors of cALL. We examined the cardiometabolic profile and performed whole-exome sequencing in 209 cALL survivors from the PETALE cohort. Variants associated with cardiometabolic outcomes were identified using PLINK (common) or SKAT (common and rare) and a logistic regression was used to evaluate their impact in multivariate models.

Results

Our results showed that rare and common variants in the BAD and FCRL3 genes were associated (p<0.05) with an extreme cardiometabolic phenotype (3 or more cardiometabolic risk factors). Common variants in OGFOD3 and APOB as well as rare and common BAD variants were significantly (p<0.05) associated with dyslipidemia. Common BAD and SERPINA6 variants were associated (p<0.05) with obesity and insulin resistance, respectively.

Conclusions

In summary, we identified genetic susceptibility loci as contributing factors to the development of late treatment-related cardiometabolic complications in cALL survivors. These biomarkers could be used as early detection strategies to identify susceptible individuals and implement appropriate measures and follow-up to prevent the development of risk factors in this high-risk population.

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Background

Childhood acute lymphoblastic leukemia (cALL) represents one third of all pediatric cancers [1]. Better understanding of the disease and treatment optimization over the last few decades has led to remarkable cure rates reaching 85% [2]. However, this therapeutic success comes at a substantial price since 60% of survivors currently face treatment-related long-term complications [3]. Children with cALL are exposed to chemo- and radiotherapy during a critical period of their development and thus have a greater risk of developing obesity [4], insulin resistance [2, 5], hypertension (HTN) [2, 6] and dyslipidemia [2], forming a metabolic syndrome (MetS) cluster [2]. These late treatment effects are worrisome since people affected by the MetS are at higher risk of atherosclerotic vascular disease [7], type 2 diabetes [8], and stroke [7]. The causes of these complications in cALL survivors remain unknown, but exposition to corticoids, methotrexate and cranial radiotherapy has been reported as contributing factor [9,10,11,12].

In the general population, accumulating evidence indicate that nutrition has an important influence on MetS susceptibility and treatment response [13,14,15,16,17]. Furthermore, several susceptibility loci and genes are linked to MetS occurrence [13]. For instance, 20-40% of the variance of arterial blood pressure, insulin resistance, body mass index (BMI) and lipid levels are explained by genetic components [13, 18,19,20,21,22]. Genome-wide association studies (GWAS) revealed that genes coding for adipokines or proteins implicated in lipoprotein metabolism and inflammation are linked to the pathogenesis of MetS [13]. Obesity is influenced by variants in genes regulating food intake, energy metabolism and neuroendocrine pathways [18, 23, 24]. Numerous genes regulating β-cells function and insulin secretion explain a significant fraction of insulin resistance [25, 26], while variants in genes related to lipoprotein metabolism could explain up to 70% of lipid level inheritance [22, 27,28,29].

Despite their importance, only a few studies evaluating the cardiometabolic risk of cALL survivors have taken genetic factors into consideration [30,31,32]. The identification of genetic biomarkers could help pinpoint high-risk individuals and develop prevention strategies to counter the development of late cardiometabolic complications. Even with the success of GWAS in identifying genetic predisposition, only 10% of the genetic variance of complex diseases can be explained by common variants [26, 33]. The missing genetic contribution might be attributed to rare variants that were not captured by traditional GWAS [34, 35] or to the combined impact of rare and common variants [36]. With next-generation sequencing technologies, it is now possible to have simultaneously access to both common and rare variants for genetic association studies [37]. The aim of this study was to assess the contribution of both rare and common genetic variants in the prevalence of cardiometabolic complication in a cohort of cALL survivors.

Methods

Cohort

Participants included were treated for cALL at Sainte-Justine University Health Center (SJUHC, Montreal, Canada) with the Dana Farber Cancer Institute (DFCI) protocols [38]. The cALL survivors were recruited as part of the PETALE study at SJUHC and had an average of 15.5 years (+/- 5.2 SD) after diagnosis [39]. Subjects who were less than 19 years old at diagnosis, more than 5 years post diagnosis, free of relapse, and who did not receive hematopoietic stem cell transplantation were invited to participate. To limit heterogeneity, the emphasis was put on pre-B ALL since this type is the most frequent [40, 41]. Participants were mainly of French Canadian origin [42, 43]. During their medical visits, participants were subjected to a series of genetic and biochemical analyses and examined by a multidisciplinary team of health professionals including physicians, nutritionists, physiotherapists and psychotherapists. The study was approved by the Institutional Review Board of SJUHC and investigations were carried out in accordance with the principles of the Declaration of Helsinki. Written informed consent was obtained from study participants or parents/guardians.

Classification of cardiometabolic risk factors

The presence of the cardiometabolic risk factors, obesity, insulin resistance, dyslipidemia and pre-HTN was assessed in all subjects. In adults, obesity was defined as a BMI ≥30 kg/m2 and/or having a waist circumference ≥88 cm (women) or 102 cm (men) [44]. In children, BMI ≥97th percentile according to the BMI charts of the World Health Organization [45] and/or waist circumference ≥95th percentile defined obesity [46]. Blood pressure was measured on the right arm in the morning at rest. In adults, blood pressure ≥130/85 and <140/90 mmHg determined arterial pre-HTN and ≥140/90 mmHg HTN [47]. For children, we used current recommendations according to age and height: blood pressure ≥90th and <95th percentile indicated pre-HTN and ≥95th percentile HTN [48, 49]. Elevated fasting glucose, glycated hemoglobin (HbA1c) and/or homeostasis model assessment (HOMA-IR) were used to identify insulin resistance. Cut-off values were fasting glucose ≥6.1 mmol/L [50] and HbA1c ≥6% [50] for both adults and children. HOMA-IR ≥2.86 (adults) [2, 51] and ≥95th percentile for a pediatric reference population [52] were considered elevated. Dyslipidemia was defined based on high low-density lipoprotein-cholesterol (LDL-C), triglycerides (TG) and/or low high-density lipoprotein-cholesterol (HDL-C) concentrations. For adults, thresholds were LDL-C ≥3.4 mmol/L [53,54,55], TG ≥1.7mmol/L [53, 55, 56] and HDL-C <1.03 mmol/L in men and <1.3 in women [56]. For children, the values were compared to the National Heart, Lung and Blood Institute guidelines for age and gender [57]. Accumulation of cardiometabolic risk factors was determined by adding the presence of dyslipidemia, pre-HTN/HTN, insulin resistance and obesity. Participants with 3 or more risk factors were defined as “extreme phenotype” while those without risk factor were defined as “healthy”.

Nutritional evaluation

Participants’ dietary intakes were collected using a validated interviewer-administered food frequency questionnaire (FFQ) [58] combined with a 3-day food record. Evaluation of nutrient intakes was performed using the Nutrition Data System for Research software v.4.03 [59]. A validated Mediterranean score calculated on a nine-point scale [60] was used to assess overall diet quality. Differences between calorie intake (calculated with the Institute of Medicine equations [61]) and estimated energy requirement (accounting for level of physical activity, equations shown in Table 1 [62]) determined energy balance.

Table 1 Estimated energy requirement equations
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Chemotherapeutic medication dose estimation

Theoretical cumulative doses of glucocorticoids (in prednisone equivalent [mg/m2]), methotrexate (mg/m2) and asparaginase (mg/m2) were calculated for each participant according to DFCI treatment protocols [38]. Exposure and doses of cranial radiotherapy were recorded according to protocol.

Genetic data treatment and selection of variants

We performed whole-exome sequencing (WES) on a total of 209 participants from the PETALE cohort. Sequencing data were obtained from SJUHC and Génome Québec Integrated Centre for Pediatric Clinical Genomic using the SOLiD (ThermoFisher Scientific) or Illumina HiSeq 2500 platforms and were aligned on the Hg19 reference genome (Fig. 1). Rare and common variants with a predicted functional impact on protein were identified by the functional annotation from ANNOVAR [63]. Only variants with a PolyPhen-2 score ≥0.85 [64] or a SIFT score ≤0.1 [65, 66] were labeled as “potentially damaging” and used for further analyses. Two lists were assembled; the first was composed of genes involved in methotrexate and corticoid metabolic pathways [67] and few genes of lipid metabolism shown to affect corticosteroid-related complications such as hypertension or osteonecrosis [68, 69]. The second list contained genes related to cardiometabolic pathways that were selected based on gene ontology terms using GOrilla [70, 71] and DisGeNET [72,73,74,75]. Variants were defined as rare (minor allele frequency (MAF) <5%) and common (MAF ≥5%) according to the reported frequency in the 1000genome [76] and ESP6500 [77] datasets for Caucasian populations. A total of 198 variants in the cardiometabolic list and 7 variants in the methotrexate and corticoid list did not conform to the Hardy-Weinberg equilibrium and were rejected.

Fig. 1
figure 1

Germline variants analysis pipeline

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Power analysis

We used Quanto version 1.2.4 to compute power analysis at 80% [78] and Bonferroni correction for the number of SNPs or genes tested. The power analysis for common variant revealed that odds ratio (OR) ranging from 3 to 11 (depending on phenotype analyzed) for variants with MAF of 5-30% can be detected, whereas the lowest OR for rare variants, assuming a MAF of 0.01 that can be detected with a given sample size, was 16.

Association studies and statistical analyses

Association between cardiometabolic risk factors and common variants were studied using PLINK (http://zzz.bwh.harvard.edu/plink/) [79, 80]. For each association, we also determined the genetic model in which the common variant affects the phenotype: dominant model (one variant allele impacts the phenotype), recessive model (two variant alleles are needed to modify the phenotype) and additive model (accumulation of variant alleles causes a gradation in the risk of developing the phenotype). Association analyses of rare variants were performed using the SKAT-O test in the SKAT package (https://cran.r-project.org/web/packages/SKAT/index.html) [35] developed for the open software R [81]. Combined rare and common variant analyses were also done with the SKAT package. The Benjamini and Hochberg method (FDR) was used to correct for multiple testing for each list and variants with a FDR less than 0.20 were kept for further analyses [81]. Selected polymorphisms were analyzed using a logistic regression model including eight covariables: age at interview, gender, cumulative doses of corticoids, methotrexate and asparaginase, exposure or not to cranial radiotherapy, Mediterranean diet score and energy balance. Finally, we used chi-square tests to compare the prevalence of cardiometabolic complications between children and adults. Statistical analyses were performed using SPSS version 22.0 [82].

Results

Cohort characteristics

The characteristics of the cohort are presented in Table 2. The cohort (53.6% female) was mostly composed of adolescents and young adults (median age of 22.4 years). Dyslipidemia was the most prevalent cardiometabolic risk factor (41.8%), followed by obesity (33.0%), insulin resistance (18.5%) and pre-HTN (10.1%). Dyslipidemia was the only risk factor for which we observed a significant difference between children and adults (30.2% vs. 46.9%, P<0.025). Of note, less than 40% of the cohort was classified as “healthy” (no MetS risk factor) and 10.7% as “extreme phenotype” (≥3 MetS risk factors).

Table 2 Characteristics of the PETALE cohort
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Genetic associations with cardiometabolic candidate genes

We analyzed 1,202 common variants from the cardiometabolic candidate gene list (Fig. 2). We found associations between common variants and two phenotypes (Table 3): dyslipidemia and the extreme phenotype. Eukaryotic Translation Initiation Factor 4B (EIF4B) (FDR 0.18) and 2-oxoglutarate and iron dependent oxygenase domain containing 3 (OGFOD3) (FDR 0.18) was associated with dyslipidemia while extreme phenotype was linked to BCL2 Associated Agonist Of Cell Death (BAD) (FDR 0.20) and Fc Receptor Like 3 (FCRL3) (FDR 0.20). The SKAT-O test performed on the 12,977 rare variants did not reveal any significant association. The rare/common variant combined analysis showed associations between the extreme phenotype and 3 genes: BAD (FDR 0.09), FCRL3 (FDR 0.09) and EIF4B (FDR 0.10) (Table 3).

Fig. 2
figure 2

Processing of single nucleotide polymorphism for cardiometabolic candidate genes

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Table 3 Significant genetic associations with cardiometabolic candidate genes
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Genetic associations with methotrexate and corticosteroid candidate genes

Next, we studied 34 common variants in the methotrexate/corticoid candidate gene list (Fig. 3). For dyslipidemia, we observed associations with BAD (FDR 0.02) and Apolipoprotein B (APOB) (FDR 0.11) (Table 4). BAD was also associated with the extreme phenotype (FDR 0.009), insulin resistance (FDR 0.07) and obesity (FDR 0.08). Moreover, insulin resistance was associated with a common variant in Serpin Family A Member 6 (SERPINA6) (FDR 0.07) (Table 4). The SKAT-O analysis for 376 rare variants revealed associations between glucocorticoid receptor (Nuclear Receptor Subfamily 3 Group C Member 1, NR3C1, FDR 0.17) and the extreme phenotype as well as between pre-HTN and Corticotropin Releasing Hormone Receptor 1 (CRHR1) (FDR 0.20) and Corticotropin Releasing Hormone Receptor 2 (CRHR2) (FDR 0.20) (Table 4). Combined rare and common variant analyses exhibited 8 associations: BAD (FDR 0.04), APOB (FDR 0.12), Cystathionine-Beta-Synthase (CBS) (FDR 0.12) and Solute Carrier Organic Anion Transporter Family Member 4C1 (SLCO4C1) (FDR 0.14) with dyslipidemia; BAD (FDR 0.003) and NR3C1 (FDR 0.15) with the extreme phenotype; and CRHR1 (FDR 0.14) and CRHR2 (FDR 0.14) with pre-HTN (Table 4).

Fig. 3
figure 3

Processing of single nucleotide polymorphism for methotrexate and corticoid pathways’ candidate genes

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Table 4 Significant genetic associations with methotrexate and corticosteroid candidate genes
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Logistic regression analysis with significant cardiometabolic candidate genes

Significant genetic variants were further analyzed in a logistic regression model including 8 covariables (see Methods). Analysis revealed independent associations between the extreme phenotype and the common variant rs2286615 in BAD (p=0.006, in a dominant effect model), age at interview (p=0.04), and exposure to cranial radiotherapy (p=0.04) (Table 5). The common and rare variant analysis showed associations between the extreme phenotype and age (p=0.03), cumulative doses of methotrexate (p=0.05), exposure to cranial radiotherapy (p=0.04) and the BAD gene (p=0.003) (Table 5). The common variant rs2282284 in FCRL3 was also associated with the extreme phenotype with a dominant effect (p=0.006) (Table 5). FCRL3 (rare and common variants) was associated with the extreme phenotype (p=0.04) while no other covariable reached statistical significance in this model (Table 5). The variant rs62079523 in OGFOD3, associated with dyslipidemia in the dominant model, was found highly significant in the logistic regression model (p=0.005) (Table 5).

Table 5 Logistic regression model with significant cardiometabolic candidate genes
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Logistic regression model with significant methotrexate and corticoid candidate genes

The results of the logistic regression analyses for the significant genes in the methotrexate/corticosteroid list are presented in Table 6. We found that the common BAD variant rs2286615 was associated with the extreme phenotype (p=0.006) in a dominant and additive effect as it was with age (p=0.04) and cranial radiotherapy (p=0.04). The combined analysis of common and rare BAD variants was significant for the extreme phenotype (p=0.003). In this model, age (p=0.03), cumulative doses of methotrexate (p=0.05) and cranial radiotherapy (p=0.04) were also significant. BAD was associated with dyslipidemia for the common variant rs2286615 (p=0.008, additive model) and for the common and rare variants (p=0.006). Also the rs2286615 variant was associated in dominant (p=0.009) and additive (p=0.006) effect model with the presence of obesity. Rs676210, a variant in APOB, had a dominant effect on the risk of dyslipidemia and was the only significant association in the logistic regression model (p=0.02). An additive effect was observed for the common variant rs2228541 (SERPINA6) and insulin resistance (p=0.05). Finally, the logistic regression model including rare variants in CRHR1 and CRHR2 for pre-HTN revealed associations for gender (p=0.03) but the genetic associations did not reach statistical significance.

Table 6 Logistic regression model with significant methotrexate and corticoid candidate genes
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Discussion

This study is among the first studies to address the contribution of genetic determinants in the development of long-term cardiometabolic complications in cALL survivors. Globally, we found that the development of an extreme cardiometabolic phenotype can be predicted by common and rare variants in BAD and FCRL3. The presence of dyslipidemia in cALL survivors is influenced by common variants in OGFOD3 and APOB and by common and rare variants in BAD. Obesity was predicted by a common variant in BAD and insulin resistance was associated with a common variant in SERPINA6. Pre-HTN was related to survivors’ gender as being a female was found protective for this complication. This gender difference between men and women before menopause has been well described in the literature [83, 84].

We found similar prevalence of obesity in children and in adults, suggesting that obesity acquired during childhood following the treatments persists thorough adulthood, a hypothesis supported by other studies [85,86,87]. Obesity is central to the MetS and is a major risk factor for HTN, dyslipidemia and insulin resistance [23, 88]. The PETALE cohort appeared to be particularly affected by dyslipidemia as almost 47% of adults were afflicted. For comparison, a study conducted in a population of young Canadian adults (18-39 years old) revealed that 34% were affected by dyslipidemia [89]. Given their young age, this finding raises concerns for the long-term cardiovascular risk of cALL survivors. In fact, 60% of our cohort was affected by at least one cardiometabolic risk factor, 10.7% of them being classified as extreme phenotypes. The observation related to the median age of 22.4 years places the survivors at high risk for early cardiovascular disease.

The common variant rs2286615 in the BAD gene was associated with extreme phenotype and obesity, whereas interactions between rare and common variants were linked to extreme phenotype and dyslipidemia. BAD is a gene that codes for a protein member of the pro-apoptotic Bcl-2 protein family named "Bcl2-associated agonist of cell death". In response to activation by hypoxia, reactive oxygen species, nutrient withdrawal or DNA damage, the pro-apoptotic proteins in the Bcl-2 family create pores in the mitochondrial membrane by which cytochrome can be released, triggering the apoptotic cascade leading to cell death [90]. BAD could have an impact on the development of insulin resistance since an imbalance between pro-apoptotic and anti-apoptotic proteins in situation of high blood glucose promotes β-cell apoptosis [90], the latest playing an important role in the pathophysiology of type 2 diabetes [90]. Studies suggest that BAD has a role in β-cell function and can promote glucose-stimulated insulin secretion [91,92,93]. Besides, it has been reported that BAD suppresses the formation of tumors in lymphocytes and that Bad-deficient mice are at higher risk of lymphoma and leukemia [94]. In another study, Bad-deficient mice were prone to cancer and did not respond adequately to DNA damage [95]. This gene is thus a suitable candidate to explain a common etiology between the predisposition to cardiometabolic complication and hematologic malignancies. Because BAD is recurrent in almost all associations with the cardiometabolic risk factors in our study, we can conclude that it is a strong candidate gene for MetS in cALL survivors. It is possible that through its effects on insulin resistance, BAD can predispose the participants to develop obesity, dyslipidemia and pre-HTN [8, 96,97,98]. As expected, age had an impact on the presence of the extreme phenotype in the model with BAD. We observed that adults were more affected by cardiometabolic complications than children. This can be explained by the fact that the establishment of cardiometabolic risk factors is a long-term and latent process. Other studies on cALL survivors have reported that obesity, diabetes and the metabolic syndrome are more frequent in patients who received cranial radiotherapy [9, 10, 99]. This is in accordance with our results showing that cranial radiotherapy significantly increased the risk of extreme phenotype. This could be caused by the impact of radiotherapy on the brain satiety control center and on hormones implicated in energy regulation [1, 100, 101]. Indeed, damages caused by cranial radiotherapy could lead to growth hormone deficiency and then to the development of metabolic disorders such as visceral obesity, hyperinsulinemia and low HDL-C [102].

Carriers of one allele of the variant rs2282284 in FCRL3, encoding for a protein that is part of the immunoglobulin receptors, were at increased risk of presenting the extreme phenotype. The common and rare variant analysis also revealed a significant association between FCRL3 and the extreme phenotype. It has a role in immune function and is expressed in secondary lymphoid organs, mostly in B lymphocytes [103]. This gene has been linked to rheumatoid arthritis, autoimmune thyroid disease and systemic lupus erythematosus [103,104,105]. In particular, the SNP rs2282284 has been associated to higher risk of neuromyelitis optica (a severe inflammatory demyelinating disease of the central nervous system) [106] and correlated with the risk of multiple sclerosis [107] in the Chinese Han population. FCRL3 role in immune regulation is of interest given the contribution of inflammation in MetS pathogenesis [7, 108, 109].

The common variant rs62079523 in OGFOD3 was found associated with dyslipidemia in the dominant model. No clear function has been reported for this gene in the literature but it was linked with the gene ontology term 2-oxoglutarate and iron-dependent oxygenase domain-containing protein 3 in our analysis.

We found the common variant rs676210 in APOB correlated with the development of dyslipidemia, the presence of the minor allele (A) being protective for the outcome. APOB codes for the apolipoproteins B-48 and B-100 that play a central role in lipid transport and metabolism. They are the main apolipoproteins of chylomicron, very low density lipoprotein (VLDL) and LDL [110, 111]. The rs676210 polymorphism induces a change (proline to leucine) in position 2739 of the protein, thereby not affecting apolipoprotein B-48, a 2152 amino acid protein that is the result of APOB RNA editing [112, 113]. In line with our results, it was demonstrated that the carriers of the major allele (G) had higher levels of oxidized LDL [114, 115] that predispose to atherosclerosis. However, these studies failed to find an association between the SNP and risk of cardiovascular events [114]. Moreover, in comparison with the carriers of the major allele G, the minor allele A was linked to lower TG, total cholesterol and LDL-C levels and with higher HDL-C [114]. This profile is favorable to a healthy cardiovascular system [114] and is in agreement with our findings. A study also reported a higher prevalence of glucocorticoid-induced hypertension in patients with an APOB polymorphism [68], which demonstrate the multiple impacts this gene can have on cardiovascular health.

The variant rs2228541 in SERPINA6 was associated with a decreased risk of insulin resistance. Similarly, common variants at the SERPINA6 locus were found associated with plasma levels of cortisol in a study comprising of 12,597 Caucasians [116]. It was postulated that this effect was mediated by changes in the total cortisol binding capacity by the corticosteroid binding globulin. Variations in plasma cortisol levels have been associated with cardiovascular disease, obesity, type 2 diabetes, HTN and dyslipidemia [116]. Thus, this SNP could be linked to cortisol levels and thus predisposes to type 2 diabetes. However, because data was not available, we could not determine if SERPINA6 variants were associated with the development of hyperglycemia during ALL treatment.

Rare variants in the CRHR1 and CRHR2 genes were linked to pre-HTN. This effect was lost in the logistic regression model, but the latter uncovered the impact of gender on the phenotype, women being protective for the outcome. The unequal distribution of the phenotype between the genders (17.53% in men and 3.57% in women) could probably explain the observed relationship.

On the other hand, corticoid and asparaginase cumulative doses did not have a significant impact on the development of cardiometabolic risk factors in our study. It appeared that exposure to cranial radiotherapy was the major risk factor to predict the development of late cardiometabolic complications. Moreover, neither the quality of diet (evaluated with the Mediterranean diet score) nor the excess in calories were found significantly associated with the outcomes in our models.

Standard contingency tables and regression model allowed us to study common variants but did not provide enough power to study rare variants [36]. We had to use a technique that analyzes the cumulative effects of different rare variants on the same gene [117]. We also performed combined rare and common variants analysis in order to detect interactions. With this strategy we were able to discover associations that could not be seen with traditional associations studies, consisting the strength of this study. The limited sample size did not provide us with optimal power, especially for rare variants analysis. Replication studies in other cohorts of cALL survivors will be needed to confirm the observed associations.

Conclusions

This study contributes to better understand the genetic determinants in the development of long-term cardiometabolic complication in childhood ALL survivors. Genetic information associated with both common and rare variants can help predict the development of late onset cardiometabolic complications. Genetic biomarkers can be used to propose prevention strategies, personalize the treatment and the follow-up to minimize the long-term sequelae and increase the quality of life of this high-risk population.

Abbreviations

BMI:

Body mass index

cALL:

Childhood acute lymphoblastic leukemia

FDR:

False discovery rate

FFQ:

Food frequency questionnaire

GWAS:

Genome-wide association study

HbA1c:

Glycated hemoglobin

HDL-C:

High-density lipoprotein cholesterol

HOMA-IR:

Homeostasis model assessment

HTN:

Hypertension

LDL-C:

Low-density lipoprotein cholesterol

MetS:

Metabolic syndrome

PETALE:

Prévenir les effets tardifs des traitements de la leucémie aigüe lymphoblastique chez l’enfant

SNP:

Single nucleotide polymorphism

TG:

Triglycerides

VLDL:

Very low-density lipoprotein

WES:

Whole exome sequencing

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Acknowledgements

Expert assistance by nutritionist Sophia Morel in the classification of cardiometabolic risk factors, Mediterranean diet score and estimated energy requirements is gratefully acknowledged. We would like to thank Alexandre Lefebvre and Aziz Rezgui for their expertise in calculating the theoretical doses of methotrexate, asparaginase and corticoids.

Funding

The PETALE study is funded by the Canadian Institutes of Health Research in collaboration with the Cancer Research Society, the Garron Family Cancer Center of the Hospital for Sick Children, the Pediatric Oncology Groups of Ontario, the Canadian Cancer Society, the C17 Research Network, the Sainte-Justine Hospital Foundation and the FRQS Applied Medical Genetics Network. JE was a recipient of studentships from the Canadian Institutes of Health Research, the Programme de sciences biomédicales, the Bourse d’excellence Hydro-Quebec de la Faculté des études supérieures et post-doctorales. VM was funded by a Transition grant from the Cole Foundation.

Availability of data and materials

The datasets are available from the corresponding author upon request.

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Authors and Affiliations

  1. Research Centre, Sainte-Justine University Health Center, 3175 chemin de la Côte-Sainte-Catherine, Montreal, Quebec, H3T 1C5, Canada

    Jade England, Simon Drouin, Patrick Beaulieu, Pascal St-Onge, Maja Krajinovic, Caroline Laverdière, Emile Levy, Valérie Marcil & Daniel Sinnett

  2. Departments of Pediatrics, Université de Montréal, Montreal, Quebec, H3T 1C5, Canada

    Caroline Laverdière & Daniel Sinnett

  3. Departments of Nutrition, Université de Montréal, Montreal, Quebec, H3T 1C5, Canada

    Emile Levy & Valérie Marcil

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  1. Jade England
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  2. Simon Drouin
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  3. Patrick Beaulieu
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  9. Daniel Sinnett
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Contributions

DS, MK, EL, SD, VM and CL conceived the study and participated in the design and coordination. VM collected the cardiometabolic data, VM and JE classified participants according to their metabolic status. PSO and PB processed the genetic data of the PETALE survivors. JE did the genetic association studies and the logistic regression model and interpreted the data. JE, VM, SD, EL and DS contributed to the writing of the manuscript. All authors have read and approved this manuscript.

Corresponding author

Correspondence to Daniel Sinnett.

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The study was approved by the Institutional Ethics Review Board of Sainte-Justine UHC. Written informed consent was obtained from study participants and/or parents/guardians.

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England, J., Drouin, S., Beaulieu, P. et al. Genomic determinants of long-term cardiometabolic complications in childhood acute lymphoblastic leukemia survivors. BMC Cancer 17, 751 (2017). https://doi.org/10.1186/s12885-017-3722-6

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BMC Cancer

ISSN: 1471-2407

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