No genome-wide correlations and little shared genetic architecture between reproductive life-history traits and estrogen receptor-positive breast cancer risk.

Genome-wide genetic correlations between ER+ breast cancer risk and reproductive traits are low and not statistically significant in European populations.

• Why it matters: Understanding the genetic links between reproductive life-history traits and breast cancer risk can shed light on evolutionary processes influencing disease development, which remain largely unclear.
• What they did: The study used genomic restricted maximum-likelihood analyses and linkage disequilibrium score regressions on biobank and GWAS data, examining three reproductive traits in European populations, with a focus on shared genetic architecture.
• The result: Findings suggest minimal shared genetic architecture and little evidence of genome-wide correlations, indicating that life-history trade-offs may play a small role in ER+ breast cancer risk, highlighting the need for further research on evolutionary mismatches.