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      Incidence of Obesity Does Not Appear to Be Increased after Treatment of Acute Lymphoblastic Leukemia in Brazilian Children: Role of Leptin, Insulin, and IGF-1

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          Background/Aims: It has been reported that children treated for acute lymphoblastic leukemia (ALL) in developed countries show an increased risk of overweight and obesity in adolescence and adulthood. However, the majority of patients who came to our observation in Brazil have low or normal body weight and only one of them was obese. Therefore, we have decided to assess some biochemical parameters possibly related to the intermediate metabolism and body composition in these patients. Methods: Two groups of subjects were studied: 27 survivors of childhood ALL (14.0 ± 4.2 years old; post-treatment interval 8.6 ± 3.9 years) (ALL group) and 17 healthy subjects (12.8 ± 4 years old) (control group) selected on the basis of their kinship with the patients. Results: 14/27 patients of the ALL group and 4/17 of the control group had leptin levels higher than the normal range for age and sex (p < 0.05). The leptin level was significantly higher in the ALL group (15.5 ± 1.8 ng/ml) than in the control group (10.7 ± 2 ng/ml) (p < 0.05). When adjusted by sex, BMI z-score, and age, the level of leptin in patients of the ALL group was 8.5 higher than in subjects of the control group (p = 0.006). Leptin/insulin correlation in the ALL group was 0.08 and in the control group it was +0.585 (p < 0.05). Conclusion: The data indicate the presence of alterations in the homeostatic regulatory mechanisms controlling body weight in Brazilian patients treated for ALL in childhood, still, it did not lead to obesity in the absence of favorable environmental conditions.

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          Most cited references 40

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          Waist circumference and abdominal sagittal diameter: best simple anthropometric indexes of abdominal visceral adipose tissue accumulation and related cardiovascular risk in men and women.

          The amount of abdominal visceral adipose tissue measured by computed tomography is a critical correlate of the potentially "atherogenic" metabolic disturbances associated with abdominal obesity. In this study conducted in samples of 81 men and 70 women, data are presented on the anthropometric correlates of abdominal visceral adipose tissue accumulation and related cardiovascular disease risk factors (triglyceride and high-density lipoprotein cholesterol levels, fasting and postglucose insulin and glucose levels). Results indicate that the waist circumference and the abdominal sagittal diameter are better correlates of abdominal visceral adipose tissue accumulation than the commonly used waist-to-hip ratio (WHR). In women, the waist circumference and the abdominal sagittal diameter also appeared more closely related to the metabolic variables than the WHR. When the samples were divided into quintiles of waist circumference, WHR or abdominal sagittal diameter, it was noted that increasing values of waist circumference and abdominal sagittal diameter were more consistently associated with increases in fasting and postglucose insulin levels than increasing values of WHR, especially in women. These findings suggest that the waist circumference or the abdominal sagittal diameter, rather than the WHR, should be used as indexes of abdominal visceral adipose tissue deposition and in the assessment of cardiovascular risk. It is suggested from these data that waist circumference values above approximately 100 cm, or abdominal sagittal diameter values > 25 cm are most likely to be associated with potentially "atherogenic" metabolic disturbances.
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            Obesity in adult survivors of childhood acute lymphoblastic leukemia: a report from the Childhood Cancer Survivor Study.

            To determine whether adult survivors (>or= 18 years of age) of childhood acute lymphoblastic leukemia (ALL) are at increased risk for obesity and to assess patient and treatment variables that influence risk. A retrospective cohort of participants of the Childhood Cancer Survivor Study was used to compare 1,765 adult survivors of childhood ALL to 2,565 adult siblings of childhood cancer survivors. Body-mass index (BMI; kilograms per square meter), calculated from self-reported heights and weights, was used to determine the prevalence of being overweight (BMI, 25-29.9) or obese (BMI >or= 30.0). Polytomous logistic regression was used to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for being overweight or obese among ALL survivors relative to the sibling control group. The age- and race-adjusted OR for being obese in survivors treated with cranial radiation doses >or= 20 Gy in comparison with siblings was 2.59 for females (95% CI, 1.88 to 3.55; P or= 20 Gy (OR, 3.81; 95% CI, 2.34 to 5.99; P or= 20 Gy is associated with an increased prevalence of obesity, especially in females treated at a young age. It is imperative that healthcare professionals recognize this risk and develop strategies to enhance weight control and encourage longitudinal follow-up.
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              Can waist circumference identify children with the metabolic syndrome?

              To determine in children the association between waist circumference (WC) and insulin resistance determined by homeostasis modeling (HOMA-IR) and proinsulinemia and components of the metabolic syndrome, including lipid profile and blood pressure (BP). Eighty-four students (40 boys) aged 6 to 13 years and matched for sex and age underwent anthropometric measurements; 40 were obese; 28, overweight; and 16, nonobese. Body mass index (BMI), WC, BP, and Tanner stage were determined. An oral glucose tolerance test, lipid profile, and insulin and proinsulin assays were performed. Children were classified as nonobese (BMI or = 95th percentile). There was univariate association (P < .01) between WC and height (r = 0.73), BMI (r = 0.96), Tanner stage (r = 0.67), age (r = 0.56), systolic BP (r = 0.64), diastolic BP (r = 0.61), high-density lipoprotein cholesterol level (r = 0.45), triglyceride level (r = 0.28), proinsulin level (r = 0.59), and HOMA-IR (r = 0.59). Multiple linear regression analysis using HOMA-IR as the dependent variable showed that WC (beta coefficient = 0.050 [95% confidence interval, 0.028 to 0.073]; P = .001) and systolic BP (beta coefficient = 0.033 [95% confidence interval, 0.004 to 0.062]; P = .004) were significant independent predictors for insulin resistance adjusted for diastolic BP, height, BMI, acanthosis nigricans, and high-density lipoprotein cholesterol level. Waist circumference is a predictor of insulin resistance syndrome in children and adolescents and could be included in clinical practice as a simple tool to help identify children at risk.

                Author and article information

                Horm Res Paediatr
                Hormone Research in Paediatrics
                S. Karger AG
                September 2007
                13 March 2007
                : 68
                : 4
                : 164-170
                aDepartment of Endocrinology, University of Brasília, bSabin Laboratory, Brasília DF, and cNeurosurgery Unit, Hospital de Base do Distrito Federal, Escola Superior em Ciências da Saúde, SES-DF, Brasilia, Brazil
                100781 Horm Res 2007;68:164–170
                © 2007 S. Karger AG, Basel

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                Page count
                Tables: 3, References: 53, Pages: 7
                Original Paper


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