1. High tumor mutational burden assessed through next-generation sequencing predicts favorable survival in microsatellite stable metastatic colon cancer patients.
- Author
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Di Mauro A, Santorsola M, Savarese G, Sirica R, Ianniello M, Cossu AM, Ceccarelli A, Sabbatino F, Bocchetti M, Carratù AC, Pentimalli F, Ferrara G, Nasti G, Caraglia M, and Ottaiano A
- Subjects
- Humans, Male, Female, Middle Aged, Aged, Prognosis, Survival Analysis, Adult, Aged, 80 and over, Multivariate Analysis, Proportional Hazards Models, Microsatellite Repeats genetics, Kaplan-Meier Estimate, Colonic Neoplasms genetics, Colonic Neoplasms pathology, Colonic Neoplasms drug therapy, High-Throughput Nucleotide Sequencing, Mutation genetics, Neoplasm Metastasis, Microsatellite Instability
- Abstract
Background: Microsatellite instability (MSI) is a well-established predictive biomarker for immune checkpoint inhibitor (ICI) response in metastatic colon cancer. Both high MSI and tumor mutational burden (TMB) are markers of genomic instability. However, the prognostic and predictive value of TMB in patients with microsatellite stable (MSS) tumors remains unclear., Methods: We evaluated the prognostic significance of TMB levels in MSS metastatic colon cancer patients undergoing standard treatments. Tumor responses were assessed using RECIST v1.1 criteria. Comprehensive clinical and molecular profiling was conducted, including next-generation sequencing (NGS) for TMB evaluation with the TruSight Oncology® kit. Overall survival (OS) was the primary endpoint. Multivariate Cox regression analysis was utilized to assess the relationship among potential prognostic factors., Results: Among 102 MSS metastatic colon cancer patients, high TMB (> 10 mut/mb) was associated with a significantly longer median OS compared to low TMB (70.0 vs 45.0 months, respectively; HR: 0.45; 95% CIs 0.21 to 0.96; P = 0.0396). Multivariate analysis, adjusting for age, gender, number of metastatic sites, response to first-line chemotherapy, RAS mutational status, and liver involvement, identified TMB as an independent prognostic factor, along with response to first-line chemotherapy., Conclusions: Our results highlight the prognostic significance of TMB in MSS metastatic colon cancer patients, suggesting its potential role in patient stratification and treatment decision-making., Competing Interests: Declarations. Ethics approval and consent to participate: In accordance with local and national laws, ethics approval and consent to participate were exempted due to the retrospective/observational and non-interventional nature of the work. However, all patients involved in this study provided written informed consent before undergoing treatment administration and molecular assessments. Consent for publication: Not applicable. Competing interests: Roberto Sirica, Giovanni Savarese, and Monica Ianniello are employed by AMES, Centro Polidiagnostico Strumentale srl, 80013 Naples, Italy. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (© 2024. The Author(s).)
- Published
- 2024
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