Journal
AMERICAN JOURNAL OF EPIDEMIOLOGY
Volume 172, Issue 9, Pages 1015-1027Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/aje/kwq233
Keywords
allergy and immunology; animals; domestic; breast feeding; child; infant; infections; leukemia
Categories
Funding
- INSERM
- Fondation de France
- Association pour la Recherche sur le Cancer (ARC)
- Agence Francaise de Securite Sanitaire des Produits de Sante (AFSSAPS)
- Agence Francaise de Securite Sanitaire de l'Environnement et du Travail (AFSSET)
- association Cent pour sang la vie
- Institut National du Cancer (INCa)
- Agence Nationale de la Recherche (ANR)
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This study investigated the role of factors considered related to early stimulation of the immune system in the etiology of childhood acute leukemia. The national registry-based case-control study ESCALE was carried out in France in 2003-2004. Population controls were frequency matched to cases on age and gender. Data were obtained from structured telephone questionnaires administered to mothers. Odds ratios were estimated using unconditional regression models adjusted for potential confounders. Included were 634 acute lymphoblastic leukemia cases, 86 acute myeloblastic leukemia cases, and 1,494 controls aged >= 1 year. Negative associations were observed between acute lymphoblastic leukemia and birth order (P for trend < 0.0001), attendance at a day-care center before age 1 year (odds ratio (OR) = 0.8, 95% confidence interval (CI): 0.6, 1.1), prolonged breastfeeding (OR = 0.7, 95% CI: 0.5, 1.0), repeated early common infections (OR = 0.7, 95% CI: 0.6, 0.9), regular contact with farm animals (OR = 0.6, 95% CI: 0.5, 0.8), frequent farm visits in early life (OR = 0.4, 95% CI: 0.3, 0.6), and history of asthma (OR = 0.7, 95% CI: 0.4, 1.0) or eczema (OR = 0.7, 95% CI: 0.6, 0.9). Results support the hypothesis that repeated early infections and asthma may play a role against childhood acute leukemia.
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