ERCC4 associated with breast cancer risk: a two-stage case-control study using high-throughput genotyping

Area of Science:

• Genetics
• Oncology
• Molecular Biology

Background:

• Linkage studies have not identified additional high-penetrance breast cancer susceptibility genes.
• A polygenic model involving common variants with modest effects is increasingly likely for breast cancer risk.
• High-throughput genotyping enables the identification of low-penetrance genes associated with common diseases.

Purpose of the Study:

• To identify low-penetrance breast cancer susceptibility genes using a two-stage case-control study.
• To investigate the association of common single-nucleotide polymorphisms (SNPs) in cancer-related genes with breast cancer risk.

Main Methods:

• A two-stage case-control design was employed in Spanish and Finnish populations.
• Genotype frequencies of 640 SNPs in 111 cancer-related genes were analyzed in stage 1.
• Candidate SNPs (P < 0.01) were further tested in stage 2, with statistical adjustments for multiple testing.

Main Results:

• One SNP, rs744154, located in intron 1 of the ERCC4 gene (nucleotide excision repair pathway), showed a significant association with protection from breast cancer.
• The association was recessive, with an odds ratio of 0.57 and a Bonferroni-adjusted P-value of 0.04 in the Finnish population.
• rs744154 is located in a highly conserved intronic region, suggesting potential functional significance.

Conclusions:

• Common intronic variation in the ERCC4 gene is associated with a reduced risk of breast cancer.
• The identified SNP, rs744154, may be a causal variant contributing to breast cancer protection.
• These findings support the role of common variants with modest effects in the polygenic model of breast cancer.