title: Demographic correlates of body size changes in children undergoing treatment for acute lymphoblastic leukemia.
abstract: BACKGROUND
  While it is known that leukemia therapy is associated with obesity in survivorship, limited information is available on its time-related pattern of development and its variation across patient subgroups. The goal of the present study was to examine demographic correlates of body mass index (BMI) changes over time from diagnosis through chemotherapy for children with B-precursor acute lymphoblastic leukemia (ALL).
  
  
  METHODS
  The study cohort consisted of 307 pediatric patients diagnosed with ALL who were treated at four South Texas pediatric oncology centers between 1990 and 2002. To minimize treatment-related variability, we excluded patients who received cranial irradiation as part of their treatment. Variation in age- and gender-standardized BMI z-scores according to age at diagnosis, gender, and ethnicity were assessed.
  
  
  RESULTS
  The overall study cohort exhibited an increase in age- and gender-adjusted BMI z-scores for the first 24 months of chemotherapy followed by a slight decrease in BMI at 30 months (end of therapy). A repeated measures analysis indicated a statistically significant difference in the time-related pattern of BMI changes for age at diagnosis (P = 0.001) but no significant effect for gender (P = 0.32) or Hispanic versus non-Hispanic ethnicity (P = 0.89).
  
  
  CONCLUSIONS
  In our cohort of ALL patients, BMI was elevated at diagnosis (mean standardized BMI z-score = 0.22, standard deviation = 1.4) then increased and remained elevated for the entire duration of chemotherapy. Children who were 2-9 years of age at diagnosis began therapy with a substantially lower BMI and remained lower over the course of chemotherapy than patients aged 10-18 years at diagnosis. It will be important for future investigations to explore the biological and behavioral factors that may underlie such differential patterns of BMI change over time.
authors.affiliation: Department of Epidemiology and Biostatistics, University of Texas Health Science Center (UTHSCSA), San Antonio, Texas 78229-3900, USA. baillargeon@uthscsa.edu
authors.forename: Jacques
authors.initials: J
authors.lastname: Baillargeon
authors.forename: Anne-Marie
authors.initials: AM
authors.lastname: Langevin
authors.forename: Margaret
authors.initials: M
authors.lastname: Lewis
authors.forename: Jaime
authors.initials: J
authors.lastname: Estrada
authors.forename: James J
authors.initials: JJ
authors.lastname: Grady
authors.forename: Judith
authors.initials: J
authors.lastname: Mullins
authors.forename: Aaron
authors.initials: A
authors.lastname: Pitney
authors.forename: Brad H
authors.initials: BH
authors.lastname: Pollock
mesh_terms: D000293:Adolescent; D000367:Age Factors; D015992:Body Mass Index; D002051:Burkitt Lymphoma / Q000150:complications / Q000175:diagnosis / Q000188:drug therapy* / Q000208:ethnology / Q000503:physiopathology*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006630:Hispanic or Latino; D006801:Humans; D008297:Male; D009765:Obesity / Q000209:etiology / Q000503:physiopathology*; D012737:Sex Factors; D013997:Time Factors