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J Epidemiol Community Health. 2015 Aug;69(8):795-802. doi: 10.1136/jech-2014-204975. Epub 2015 Mar 19.

Race/ethnicity and the risk of childhood leukaemia: a case-control study in California.

Author information

1
Department of Epidemiology, UCLA Fielding School of Public Health, Los Angeles, California, USA.
2
Department of Biostatistics, UCLA Fielding School of Public Health, Los Angeles, California, USA.
3
Department of Preventive Medicine, University of Southern California, Los Angeles, California, USA.
4
Department of Epidemiology and Computational Biology, Exponent Engineering and Scientific Consulting, Menlo Park, California, USA.
5
Environment Department, Electric Power Research Institute, Palo Alto, California, USA.

Abstract

BACKGROUND:

We conducted a large registry-based study in California to investigate the association between race/ethnicity and childhood leukaemia focusing on two subtypes: acute lymphoblastic leukaemia (ALL) and acute myeloid leukaemia (AML).

METHODS:

We obtained information on 5788 cases and 5788 controls by linking California cancer and birth registries. We evaluated relative risk of childhood leukaemia by race and ethnicity of the child and their parents using conditional logistic regression, with adjustment for potential confounders.

RESULTS:

Compared with Whites, Black children had lower risk of ALL (OR=0.54, 95% CI 0.45 to 0.66) as well as children of Black/Asian parents (OR=0.31, 95% CI 0.10 to 0.94). Asian race was associated with increased risk of AML with OR=1.643, 95% CI 1.10 to 2.46 for Asian vs Whites; and OR=1.67, 95% CI 1.04 to 2.70 for Asian/Asian vs White/White. Hispanic ethnicity was associated with increased risk of ALL (OR=1.37, 95% CI 1.22 to 1.52). A gradient in risk of ALL was observed while comparing Hispanic children with both parents Hispanic, one parent Hispanic and non-Hispanic children (p Value for trend <0.0001). The highest risk of ALL was observed for children with a combination of Hispanic ethnicity and White race compared with non-Hispanic whites (OR=1.27, 95% CI 1.12 to 1.44). The lowest risk was observed for non-Hispanic blacks (OR=0.46, 95% CI 0.36 to 0.60). Associations for total childhood leukaemia were similar to ALL.

CONCLUSIONS:

Our results confirm that there are ethnic and racial differences in the incidence of childhood leukaemia. These differences indicate that some genetic and/or environmental/cultural factors are involved in aetiology of childhood leukaemia.

KEYWORDS:

CANCER; EPIDEMIOLOGY; ETHNICITY; PAEDIATRIC

PMID:
25792752
PMCID:
PMC4550439
DOI:
10.1136/jech-2014-204975
[Indexed for MEDLINE]
Free PMC Article

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