A recent study published in JAMA Network Open provides new data on how genetic ancestry influences colorectal cancer risk. Researchers analyzed data from more than 316,000 participants in the NIH All of Us Research Program to determine if genetic background offers more precise risk stratification than traditional self-reported race and ethnicity categories.
The findings highlight a significant divergence between crude cancer burden and age-specific risk. While individuals of European ancestry showed 50 percent higher crude odds of colorectal cancer, the data reveals that American admixed-Latino and East Asian ancestry groups face a higher age-specific risk when adjusting for the competing risk of death. These groups were also diagnosed at a younger median age compared to their European counterparts.
While genetic markers provide new insights, the study confirms that established clinical predictors remain vital. Factors such as family history of polyps or cancer, type 2 diabetes, and smoking habits were the most significant indicators in the researchers' predictive models. Socioeconomic factors also play a role, with different associations found between household income, social vulnerability, and cancer risk depending on the participant's ancestry.
The research team used an extreme gradient boosting model to test risk prediction accuracy. This approach achieved a high performance level, suggesting that genomic data could serve as a valuable tool for future screening and risk enrichment. By moving beyond basic demographic categories, health systems may gain the ability to provide more targeted preventative care.
Despite the progress, the authors noted that this study is limited by its reliance on a specific research cohort rather than a general population sample. Future research needs to account for more granular data, including molecular tumor characteristics and specific locus-level ancestry, to refine these predictive models further.