This study was designed to comprehend the clinicopathological characteristics associated with individual codon-specific KRAS mutations in colorectal cancer including codon 12, 13, and 61. Furthermore, the main objective of this study was to determine whether KRAS codon 13 mutation could serve as a prognostic biomarker of colorectal cancer in a relatively large cohort of subjects. Overall survival (OS) and recurrence-free survival (RFS) were calculated from the date of surgery and compared using the Kaplan-Meier method and log-rank test. For analysis of risk factors for tumor recurrence, Cox proportional hazards regression model was used with the covariance input criterion set as \< 0.1. Patients were subdivided based on primary tumor location (colon versus rectum), and MSI status (MSS/MSI-low versus MSI-high).
