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• W4224439051 abstract "Omshree ShettyVikas OstwalIntroduction The present study evaluates the mutation pattern and frequency of BRAF , PIK3CA and RAS in colorectal carcinoma observed in the tertiary cancer center in India. Materials and Methods Consecutive cases of colorectal adenocarcinoma ( n = 330) registered from January 2015 to December 2019 (5-year duration) were selected for the study. Molecular analysis for BRAF . PIK3CA (exon 9 and 20) and RAS ( KRAS & NRAS ) was performed on representative formalin-fixed paraffin-embedded tissues by Sanger sequencing. Results were correlated with clinicopathological features. Patient overall survival (OS) was obtained using Kaplan-Meier method. Results The study cohort was in the age range of 22 to 81 years (median age: 52 years) that included 202 males and 96 females (male: female ratio 2.1:1). BRAF V600E mutation was observed in three cases (1%), while 17 cases (5.7%) had mutations in the PIK3CA gene (exon 9 or exon 20). Mutation analysis for RAS gene ( KRAS & NRAS ) was observed among 42 (15.4%) cases with KRAS mutation and 11 (4%) cases were positive for NRAS mutations. Among RAS, KRAS G12D was the predominant mutation. Median OS with wild-type RAS was 46.6 months (95% confidence interval [CI]: 22.4-70.8), while for RAS mutated patients, it was 25.6 months (95% CI: 16.7-34.5), hazard ratio: 1.7 (95% CI: 1.1-2.7, p = 0.025). Conclusion This study evaluated the prevalence of BRAF, PIK3CA and RAS mutations in the Indian cohort and its impact on clinical behavior. There was lower incidence of BRAF mutations in this cohort and PIK3CA mutation (single) did not impact survival of the patients." @default.
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• W4224439051 date "2022-04-25" @default.
• W4224439051 modified "2023-09-25" @default.
• W4224439051 title "The Prevalence of BRAF, PIK3CA, and RAS Mutations in Indian Patients with Colorectal Cancer" @default.
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• W4224439051 doi "https://doi.org/10.1055/s-0041-1740244" @default.
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