Overweight and Obesity as Prognostic Factors for Survival in Children With Acute Lymphoblastic Leukemia

Study Overview
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Brief Summary
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Background: Mexico City has one of the highest incidences and mortality rates of acute lymphoblastic leukemia (ALL) in the world and a high frequency of early relapses (17%) and early mortality (15%). Otherwise, childhood overweight and obesity are reaching epidemic proportions. They have been associated with poor outcomes in children with ALL. The aim of present study is to identify if overweight and obesity are prognostic factors associated with survival rates in Mexican children with ALL. Methods: Multicenter cohort study. ALL children younger than 15 years old are included and followed-up. Overweight and obesity are classified according World Health Organization (WHO) and Centers for Disease Control and Prevention (CDC) criteria. Deaths and relapses are the main outcomes.

Detailed Description
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Data collection Information regarding sex, age at diagnosis, place of residence, white blood cell (WBC) count, immunophenotype (B or T lineage), weight and height (length when appropriate) at diagnosis, and chemotherapy protocol is collected from the patients' clinical charts by previously standardized staff. Overcrowding was used as a proxy for socioeconomic status (SES) according to the Bronfman's criteria (high SES, up to 1.5 people per room; medium-low SES, more than 1.6 people per room). The risk classification is according to the criteria of the National Cancer Institute (NCI): standard risk [ages from 1 to 9.99 years; WBC count < 50 × 109/L] or as high risk [age < 1 or ≥ 10 years or WBC ≥ 50 × 109/L]. Assessment of nutritional status at diagnosis of ALL BMI at diagnosis will be used.. Using WHO software (version 3.2.2, World Health Organization, Geneva), the BMI-for-age Z-scores were calculated for each patient. According to WHO classification, patients were categorized as normal (- 1.9999 to 0.9999), wasted (- 2 to - 2.9999), severely wasted (≥ - 3), at risk of overweight (1-1.9999), overweight (2 to 2.9999) and obesity (≥3). In addition, the BMI percentiles cutoffs provided by CDC were: normal (p5-84.9999), underweight (< p5), overweight (p85-94.9999), and obese (≥ p95). The nutritional classification and measurements validation regarding weight and height recorded in clinical files used to classify patients' nutritional status in present research has been previously described. Underweight patients were excluded from the analyses. Sample size The sample size calculation was performed using Epi-Info version 7 software taking into account a mortality outcome frequency of 10.8% in the unexposed group (normal weight patients) and a death outcome frequency of 24% for the exposed (obese/overweight patients), a statistical power of 80% and a confidence of 95%; resulting in a total n of 350 overweight/obese patients to be compared with the rest of the cohort that are not overweight and obese. Statistical analysis Descriptive statistics and relative risks (RR) calculation with 95% confidence intervals (CI) will be carried out. Kaplan-Meier survival analysis will be conducted. Log-rank test will be calculated. The analyses will be conducted independently for disease-free-survival (DFS) or overall survival (OS), adjusting for variables whose effects on the studied outcomes have been previously documented (age, sex, socioeconomic status, immunophenotype, NCI risk classification, and chemotherapy protocol). A Cox proportional hazard model will be used. Hazard ratios (HR) with 95% CIs will be calculated.

Official Title
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Overweight and Obesity as Prognostic Factors for Survival in Children With Acute Lymphoblastic Leukemia

Conditions
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Leukemia, Lymphoblastic

Intervention / Treatment
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* Other: Chemotherapy protocol used


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients under 15 years of age Newly diagnosed with acute lymphoblastic leukemia Diagnosis confirmation by bone marrow aspiration and immunophenotype Attended in the participating Hospitals. Exclusion Criteria: - Patients with Down Syndrome (for being a population with different disease behavior and cytogenetic alterations than patients without this genetic condition)

Ages Eligible for Study
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Minimum Age: 1 Day
Maximum Age: 15 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Overweight/Obesity<br>BMI at diagnosis will be used. Using WHO software (version 3.2.2, World Health Organization, Geneva), the BMI-for-age Z-scores were calculated for each patient. According to WHO classification, patients were categorized as normal (- 1.9999 to 0.9999), wasted (- 2 to - 2.9999), severely wasted (≥ - 3), at risk of overweight (1-1.9999), overweight (2 to 2.9999) and obesity (≥3). In addition, the BMI percentiles cutoffs provided by CDC were: normal (p5-84.9999), underweight (< p5), overweight (p85-94.9999), and obese (≥ p95). The nutritional classification and measurements regarding weight and height recorded in clinical files will be used to classify patients' nutritional status in present research has been previously described. | Other: Chemotherapy protocol used<br>* Chemotherapy protocol used in each participating hospital<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall survival | Deaths of patients occurring during the follow-up period will be collected. The cause of death and the date that this occurred will be also registered. In the case of patients alive at the end of follow-up, the date of the last visit to the hospital will be collected. | year 5 | 
| Disease-free survival | Clinical data and by complementary examinations indicating that there is reappearance of the disease after complete remission has been achieved, presence of blasts > 5% in bone marrow (bone marrow relapse) or presence of blasts in cerebrospinal fluid fluid (CNS relapse), testicular infiltration by blasts in the biopsy (testicular relapse), combined (bone marrow/CNS) at any time during treatment . In case the patient has relapsed, the site of relapse will be collected (bone marrow, CNS, testicle, ovary, eye, etc.). | year 5 | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Overweight, Obesity, Survival, Children