ArticleCancers2025
KRAS G12A Identifies a High-Risk Subset in Resected Stage II-III Colorectal Cancer.
Article in Cancers, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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15 authors.
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Abstract
backgroundKRAS mutations are detected in ~40% of colorectal cancer (CRC), yet their prognostic value is heterogeneous across specific substitutions; the impact of uncommon variants, particularly in non-metastatic disease, remains uncertain.
methodsWe evaluated the prognostic role of the relatively infrequent KRAS G12A substitution in two independent retrospective cohorts of stage II-III CRC treated with surgical resection without neoadjuvant therapy: an institutional series (FMU; n = 299) and a public dataset (AC-ICAM; n = 178). Tumors were genotyped for KRAS (and BRAF in AC-ICAM), and relapse-free survival (RFS) and overall survival (OS) were investigated.
resultsKRAS G12A comprised 3.0% (FMU) and 3.4% (AC-ICAM). Across genotypes, G12A showed the highest univariable hazards compared to wild-type (WT) references for both RFS and OS in each cohort. Notably, RFS events among G12A clustered within 12 months of surgery. In multivariable Cox models, G12A remained independently associated with worse RFS and OS in each cohort, whereas non-G12A KRAS mutations did not differ significantly from the WT references.
conclusionsAcross two cohorts, KRAS G12A identified a small but clinically meaningful high-risk subset of stage II-III CRC characterized by early recurrence and inferior survival. Recognition of this variant may inform postoperative risk stratification in the adjuvant setting.
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