Colorectal Tumors in Diverse Patient Populations Feature a Spectrum of Somatic Mutational Profiles.

Document Type

Article

Publication Date

5-15-2025

Identifier

DOI: 10.1158/0008-5472.CAN-24-0747

Abstract

Admixed populations, including the Hispanic/Latino/a community, are underrepresented in cancer genetic/genomic studies. Leveraging the Latino Colorectal Cancer Consortium (LC3) and other existing datasets, we analyzed whole-exome sequencing data on tumor/normal pairs from 718 individuals with colorectal cancer to map somatic mutational features by ethnicity and genetic similarity. Global proportions of African, Asian, European, and Native American genetic ancestries were estimated using ADMIXTURE. Associations between these proportions and somatic mutational features were examined using logistic regression. APC, TP53, and KRAS were the top three mutated genes across all participants and in the subset of Latino individuals in LC3. In analyses examining recurrently mutated genes, tumors from patients of Latino ethnicity had fewer KRAS and PIK3CA mutations compared with tumors from non-Latino patients. Genetic ancestry overall was associated with CDC27 mutation status, and African genetic ancestry was associated with SMAD2 mutation status. In exome-wide analyses, African genetic ancestry was significantly associated with higher odds of mutation in KNCN and TMEM184B. Native American genetic ancestry was associated with a lower frequency of microsatellite instability-high tumors. The SBS11 mutational signature was associated with Native American genetic ancestry as well as Latino ethnicity. In an independent replication dataset, MSK-IMPACT, estimates of association were largely consistent in direction but nonsignificant. A meta-analysis of LC3 and MSK-IMPACT showed that African genetic ancestry was significantly associated with KRAS mutation status and MSI status. This work facilitates precision medicine initiatives by providing insights into the contribution of genetic ancestry to molecular features of colorectal tumors. Significance: Analysis of tumors from various populations can broadly characterize genomic landscapes and enhance precision medicine strategies.

Journal Title

Cancer research

Volume

85

Issue

10

First Page

1928

Last Page

1944

MeSH Keywords

Aged; Female; Humans; Male; Middle Aged; Colorectal Neoplasms; Exome Sequencing; Hispanic or Latino; Microsatellite Instability; Mutation; Proto-Oncogene Proteins p21(ras); Racial Groups

PubMed ID

40126181

Keywords

Colorectal Neoplasms; Exome Sequencing; Hispanic or Latino; Microsatellite Instability; Mutation; Proto-Oncogene Proteins p21(ras); Racial Groups

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