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- W4380201462 abstract "Growing evidence suggests that genetic predisposition significantly increases the risk of hepatocellular carcinoma (HCC), independently from the presence of other risk factors. Here, we report a novel germline DICER1 mutation associated with familial recurrent liver tumors. We then aimed to investigate the contribution of constitutional and somatic DICER1 mutations on HCC occurrence.We investigated two individuals of a single family that developed recurrent well-differentiated hepatocellular tumors over the years. Histological slides from surgically resected tumors were reviewed. Exome sequencing was performed on constitutional DNA from circulating lymphocytes in both patients. The presence of somatic DICER1 mutations was analyzed in 243 liver tumors. MicroRNA (miRNA) sequencing was performed in 50 liver tumors to identify groups of tumors with similar profiles and differentially expressed miRNAs (DEMs).A pathological study identified hepatocellular adenomas and well-differentiated carcinomas in both patients. Tumors exhibited Wnt/β-catenin pathway activation, with strong and diffuse glutamine synthetase expression. Interestingly, non-tumor liver tissues showed abnormal liver zonation as previously reported in Dicer1 knockout mouse livers. Screening for DICER1 mutations in 243 sporadic liver tumors identified six tumors with somatic DICER1 mutations. In HCCs, DICER1 mutations were significantly associated with CTNNB1 mutations (p = 0.03). miRNA profiling identified a specific expression profile in DICER1-mutated tumors with a decreased expression of mature miRNAs compared to the other samples. Among the DEMs, downregulation of let-7a and miR-365b was closely related to DICER1 mutations.Our results highlight the role of DICER1 mutations in liver carcinogenesis in a specific subtype of familial and sporadic hepatocellular carcinomas associated with β-catenin activation.DICER1 germline mutations are known to predispose individuals to the development of malignant tumors, mainly pleuropulmonary blastoma and ovarian Sertoli-Leydig cell tumor. Here, we described familial HCC associated with a novel DICER1 germline mutation and altered liver zonation. Familial and sporadic HCCs carrying DICER1 mutations are associated with CTNNB1 mutation and characterized by a reduced expression of specific mature miRNAs." @default.
- W4380201462 created "2023-06-11" @default.
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- W4380201462 date "2023-06-01" @default.
- W4380201462 modified "2023-09-25" @default.
- W4380201462 title "Prevalence of Rhabdomyosarcoma in the U.S. from 2017-2018: A SEER study" @default.
- W4380201462 cites W2111077806 @default.
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- W4380201462 doi "https://doi.org/10.1016/j.jnma.2023.06.001" @default.
- W4380201462 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/37308344" @default.
- W4380201462 hasPublicationYear "2023" @default.
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