Breastfeeding patterns and risk of childhood acute lymphoblastic leukaemia

M L Kwan, P A Buffler, J L Wiemels, C Metayer, S Selvin, J M Ducore, G Block, M L Kwan, P A Buffler, J L Wiemels, C Metayer, S Selvin, J M Ducore, G Block

Abstract

The risk of childhood acute lymphoblastic leukaemia (ALL) was investigated in relation to breastfeeding patterns in the Northern California Childhood Leukaemia Study. Data collected by self-administered and in-person questionnaires from biological mothers of leukaemia cases (age 0-14 years) in the period 1995-2002 were matched to birth certificate controls on date of birth, sex, Hispanic ethnic status, and maternal race. Ever compared to never breastfeeding was not associated with risk of ALL at ages 1-14 years (odds ratio=0.99; 95% CI=0.64-1.55) and ages 2-5 years (OR=1.49; 95% CI=0.83-2.65). Various measures of breastfeeding duration compared to absence of breastfeeding also had no significant effect on risk. Complimentary feeding characteristics such as type of milk/formula used and age started eating solid foods among breastfed children were not associated with ALL risk. This study provides no evidence that breastfeeding affects the occurrence of childhood ALL.

Figures

Figure 1
Figure 1
Control selection strategy in the NCCLS for the breastfeeding patterns analysis (19 August 1995 to 30 November 2002). aAssuming the same percentage of eligible as that in potential controls who were found and whose eligibilities were assessed.

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