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The current algorithm for Lynch syndrome diagnosis is highly complex with multiple steps which can result in an extended time to diagnosis while depleting precious tumor specimens. Here we describe the analytical validation of a custom probe-based NGS tumor panel, TumorNext-Lynch-MMR, which generates a comprehensive genetic profile of both germline and somatic mutations that can accelerate and streamline the time to diagnosis and preserve specimen. TumorNext-Lynch-MMR can detect single nucleotide variants, small insertions and deletions in 39 genes that are frequently mutated in Lynch syndrome and colorectal cancer. Moreover, the panel provides microsatellite instability status and detects loss of heterozygosity in the five Lynch genes; , , , and . Clinical cases are described that highlight the assays ability to differentiate between somatic and germline mutations, precisely classify variants and resolve discordant cases.
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http://dx.doi.org/10.18632/oncotarget.24854 | DOI Listing |
ESMO Open
September 2025
Saint Antoine Hospital, Assistance Publique Hôpitaux de Paris (APHP), Sorbonne Université, Paris, France; Unité Mixte de Recherche Scientifique 938, SIRIC CURAMUS, Paris, France.
Background: Immune checkpoint inhibitors (ICIs) represent a paradigm shift and a therapeutic revolution in the management of mismatch repair-deficient/microsatellite instability-high (dMMR/MSI-H) colorectal cancer (CRC), and therefore for patients with Lynch syndrome (LS). The risk of developing metachronous cancers and colorectal polyps in a population of LS patients treated with ICI(s) is not well understood.
Materials And Methods: In a single-center cohort study, we retrospectively reviewed 93 LS patients from the prospective 'ImmunoMSI' cohort, who were diagnosed with dMMR/MSI-H gastrointestinal cancer and were treated with ICIs for index metastatic gastrointestinal cancer between February 2015 and April 2024.
JACC Case Rep
September 2025
Pulmonary Hypertension Multidisciplinary Unit, Cardiology Department, Hospital Universitario 12 de Octubre, and CIBERCV, Madrid, Spain; Instituto de Investigación Sanitaria Hospital 12 de Octubre (imas12), Madrid, Spain.
Background: BMPR2 mutations cause heritable pulmonary arterial hypertension (PAH) and may also influence epithelial carcinogenesis.
Case Summary: We report 3 women with BMPR2-related PAH who developed early onset epithelial cancers: 2 breast cancers (34 and 54 years of age) and 1 colorectal cancer (47 years of age). All were on advanced PAH therapy at diagnosis.
Korean J Clin Oncol
August 2025
Department of Surgery, Soonchunhyang University Bucheon Hospital, Soonchunhyang University College of Medicine, Bucheon, Korea.
Purpose: Multiple primary tumors arising in the same individual pose challenges for precision oncology, particularly in the context of hereditary cancer syndromes such as Lynch syndrome. While these tumors may originate from a shared germline predisposition, it remains unclear whether they also share somatic alterations that could be therapeutically exploited. This study aimed to characterize the extent of somatic genomic overlap between synchronous or metachronous gastric and colorectal cancers within young Korean patients.
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September 2025
Cancer Genetics Service, Division of Medical Oncology, National Cancer Centre Singapore, Singapore, Singapore.
This study compares three hereditary colorectal cancer (CRC) registries-the Iranian Hereditary Colorectal Cancer Registry (IHCCR), the Singapore Polyposis Registry (SPR), and the University of Cape Town Familial CRC Registry-to illuminate diverse approaches to identification, management, and research across different healthcare systems. Each registry, while emphasizing patient diversity, employed unique strategies reflecting available resources and epidemiological contexts. The IHCCR, leveraging WES, revealed considerable genetic heterogeneity, including novel mutations.
View Article and Find Full Text PDFTissue microenvironment characteristics associated with elevated risk of colorectal cancer (CRC) in Lynch syndrome (LS) are poorly characterized. We applied the multimodal single cell sequencing platform ExCITE-seq to define the colonic cellular composition and transcriptome of LS carriers with and without a history of CRC compared with general population controls. Our analysis revealed widespread remodeling in LS that included striking expansion of epithelial stem and progenitor cells, and loss of fibroblast populations.
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