Article ; Online: Tumor analysis of MMR genes in Lynch-like syndrome: Challenges associated with results interpretation.
2024 Volume 13, Issue 7, Page(s) e7041
Abstract: Background: Up to 70% of suspected Lynch syndrome patients harboring MMR deficient tumors lack identifiable germline pathogenic variants in MMR genes, being referred to as Lynch-like syndrome (LLS). Previous studies have reported biallelic somatic MMR ... ...
Abstract | Background: Up to 70% of suspected Lynch syndrome patients harboring MMR deficient tumors lack identifiable germline pathogenic variants in MMR genes, being referred to as Lynch-like syndrome (LLS). Previous studies have reported biallelic somatic MMR inactivation in a variable range of LLS-associated tumors. Moreover, translating tumor testing results into patient management remains controversial. Our aim is to assess the challenges associated with the implementation of tumoral MMR gene testing in routine workflows. Methods: Here, we present the clinical characterization of 229 LLS patients. MMR gene testing was performed in 39 available tumors, and results were analyzed using two variant allele frequency (VAF) thresholds (≥5% and ≥10%). Results and discussion: More biallelic somatic events were identified at VAF ≥ 5% than ≥10% (35.9% vs. 25.6%), although the rate of nonconcordant results regarding immunohistochemical pattern increased (30.8% vs. 20.5%). Interpretation difficulties question the current utility of the identification of MMR somatic hits in the diagnostic algorithm of suspected LS cases. |
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MeSH term(s) | Humans ; Colorectal Neoplasms/genetics ; Colorectal Neoplasms, Hereditary Nonpolyposis/diagnosis ; Colorectal Neoplasms, Hereditary Nonpolyposis/genetics ; Colorectal Neoplasms, Hereditary Nonpolyposis/pathology ; Germ-Line Mutation ; Neoplastic Syndromes, Hereditary ; Brain Neoplasms ; DNA Mismatch Repair/genetics |
Language | English |
Publishing date | 2024-04-01 |
Publishing country | United States |
Document type | Journal Article |
ZDB-ID | 2659751-2 |
ISSN | 2045-7634 ; 2045-7634 |
ISSN (online) | 2045-7634 |
ISSN | 2045-7634 |
DOI | 10.1002/cam4.7041 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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