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We investigated associations between pretherapeutic BMI, cytogenetic abnormalities, and outcome in a large multinational cohort of children with AML.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We included patients, age 2\u201017\u00a0years, diagnosed with de novo AML from the five Nordic countries (2004\u20102016), Hong Kong (2007\u20102016), the Netherlands and Belgium (2010\u20102016), and Canada and USA (1995\u20102012). BMI standard deviations score for age and sex was calculated and categorized according to the World Health Organization. Cumulative incidence functions, Kaplan\u2010Meier estimator, Cox regression, and logistic regression were used to investigate associations.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>In total, 867 patients were included. The median age was 10\u00a0years (range 2\u201017\u00a0years). At diagnosis, 32 (4%) were underweight, 632 (73%) were healthy weight, 127 (15%) were overweight, and 76 (9%) were obese. There was no difference in relapse risk, treatment\u2010related mortality or overall mortality across BMI groups. The frequency of t(8;21) and inv(16) increased with increasing BMI. For obese patients, the sex, age, and country adjusted odds ratio of having t(8;21) or inv(16) were 1.9 (95% confidence interval (CI) 1.1\u20103.4) and 2.8 (95% CI 1.3\u20105.8), respectively, compared to healthy weight patients.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>This study did not confirm previous reports of associations between overweight and increased treatment\u2010related or overall mortality in children. Obesity was associated with a higher frequency of t(8;21) and inv(16). AML cytogenetics appear to differ by BMI status.<\/jats:p><\/jats:sec>","DOI":"10.1002\/cam4.2554","type":"journal-article","created":{"date-parts":[[2019,9,18]],"date-time":"2019-09-18T11:53:16Z","timestamp":1568807596000},"page":"6634-6643","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Associations between pretherapeutic body mass index, outcome, and cytogenetic abnormalities in pediatric acute myeloid leukemia"],"prefix":"10.1002","volume":"8","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9935-9157","authenticated-orcid":false,"given":"Ditte J. 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