The Childhood Leukemia International Consortium

Area of Science:

• Pediatric Oncology
• Epidemiology
• Genetics

Background:

• Childhood leukemia, primarily acute lymphoblastic leukemia (ALL) and acute myeloid leukemia (AML), is diverse with varying cytogenetic and molecular characteristics.
• Potential etiologies involve infectious/immunologic factors, fetal growth, and environmental exposures, with growing evidence for gene-environment interactions.
• Previous studies, particularly for ALL, have gathered data on risk factors but often lacked the power to investigate gene-environment interactions.

Purpose of the Study:

• The Childhood Leukemia International Consortium (CLIC) was established to facilitate research on rare exposures, gene-environment interactions, and subtype-specific associations.
• CLIC aims to pool data from independent studies to enhance statistical power and enable comprehensive investigations.
• The consortium seeks to address knowledge gaps concerning the etiology of childhood leukemia.

Main Methods:

• CLIC comprises 22 studies from 12 countries, with data collected from 1962 to the present.
• The consortium includes approximately 31,000 cases and 50,000 controls, with detailed epidemiologic data from 19 case-control studies.
• DNA samples are available from children and child-parent trios in a significant portion of the studies, alongside registry-based and hospital record data.

Main Results:

• The pooled data from CLIC allows for robust investigation of environmental and genetic risk factors in childhood leukemia.
• CLIC facilitates the study of critical exposure windows and their impact on leukemia development.
• The consortium enables detailed analysis of gene-environment interactions and associations with specific leukemia subtypes.

Conclusions:

• CLIC offers a unique platform to investigate the complex interplay of genetic and environmental factors in childhood leukemia etiology.
• The consortium's data will advance understanding of gene-environment interactions and their role in specific leukemia subtypes.
• CLIC's findings will contribute to identifying risk factors and potential preventive strategies for childhood leukemia across diverse ethnic groups.