Inbreeding and Gallbladder Cancer Risk: Homozygosity Associations Adjusted for Indigenous American Ancestry, BMI, and Genetic Risk of Gallstone Disease

2024

Inbreeding and Gallbladder Cancer Risk in Chileans

Sample size: 4029 publication 10 minutes Evidence: moderate

Author Information

Author(s): Ceballos Francisco, Boekstegers Felix, Scherer Dominique, Barahona Ponce Carol, Marcelain Katherine, Gárate-Calderón Valentina, Waldenberger Melanie, Morales Erik, Rojas Armando, Munoz César, Retamales Javier, de Toro Gonzalo, Vera Kortmann Allan, Barajas Olga, Rivera María Teresa, Cortés Analía, Loader Denisse, Saavedra Javiera, Gutiérrez Lorena, Ortega Alejandro, Bertrán Maria Enriqueta, Bartolotti Leonardo, Gabler Fernando, Campos Mónica, Alvarado Juan, Moisán Fabricio, Spencer Loreto, Nervi Bruno, Carvajal-Hausdorf Daniel, Losada Héctor, Almau Mauricio, Fernández Plinio, Olloquequi Jordi, Salinas Pamela, Lorenzo Bermejo Justo, Geller David A., Roncucci Luca

Primary Institution: Statistical Genetics Research Group, Institute of Medical Biometry, Heidelberg University

Hypothesis

What is the relationship between inbreeding, genetic ancestry, and gallbladder cancer risk in Chileans?

Conclusion

The study found no direct association between inbreeding and overall gallbladder cancer risk, but certain factors like sex, age, and genetic predisposition influenced the risk.

Supporting Evidence

The study analyzed genetic data from over 4000 Chileans, a population with high gallbladder cancer rates.
Inbreeding in Chileans is influenced by both genetic drift and consanguinity.
Interactions of homozygosity with sex, age, and genetic predisposition were significant in affecting gallbladder cancer risk.
Men showed a 19% increase in gallbladder cancer risk for every 1% increase in homozygosity.
Individuals under 60 years had a 30% increase in gallbladder cancer risk for each 1% increase in homozygosity.
Those with a higher genetic risk of gallstone disease had a 12% increased risk of gallbladder cancer per 1% increase in homozygosity.

Takeaway

The study looked at how inbreeding might affect the risk of gallbladder cancer in Chileans, finding that it doesn't directly increase risk but interacts with other factors.

Methodology

The study used multiple logistic regression to assess the association between homozygosity and gallbladder cancer risk, considering various factors like age, sex, and genetic risk of gallstone disease.