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Case Report Series: Aggressive HR Deficient Colorectal Cancers Related to BRCA1 Pathogenic Germline Variants. | LitMetric

AI Article Synopsis

Article Abstract

Objective: The link between and homologous recombination deficiency (HRD) in cancer has gained importance with the emergence of new targeted cancer treatments, while the available data on the role of the gene in colorectal cancer (CRC) remain contradictory. The aim of this case series was to elucidate the role of known pathogenic variants in the development of early-onset CRC.

Design: Patients were evaluated using targeted next generation sequencing, exome sequencing and chromosomal microarray analysis of the paired germline and tumor samples. These results were used to calculate the HRD score and the frequency of mutational signatures in the tumors.

Results: Three patients with metastatic CRC were heterozygous for a previously known nonsense variant. All tumors showed remarkably high HRD scores, and the HRD-related signature 3 had the second highest contribution to the somatic pattern of variant accumulation in the samples (23% in 1 and 2, and 13% in sample 3).

Conclusions: A germline pathogenic variant can be involved in CRC development through HRD. Thus, testing should be considered in young patients with a personal history of microsatellite stable CRC as this could further allow a personalized treatment approach.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8911702PMC
http://dx.doi.org/10.3389/fonc.2022.835581DOI Listing

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