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- W3125962341 abstract "Testicular germ cell tumors (TGCTs) are the most common cancers in men aged 15–39 years and are divided into two major groups, seminomas and nonseminomas. Novel treatment options are required for these patients, to limit side effects of chemotherapy. We hypothesized that promoter methylation of relevant homologous recombination (HR) genes might be predictive of response to poly-ADP ribose polymerase inhibitors (PARPis) in TGCTs. We report a study pipeline combining in silico, in vitro, and clinical steps. By using several databases and in silico tools, we identified BRCA1, RAD51C, PALB2, RAD54B, and SYCP3 as the most relevant genes for further investigation and pinpointed specific CpG sites with pronounced negative correlation to gene expression. Nonseminomas displayed significantly higher methylation levels for all target genes, where increased methylation was observed in patients with more differentiated subtypes and higher disease burden. We independently performed second-line targeted validation in tissue series from TGCT patients. A moderate and/or strong anti-correlation between gene expression (assessed by RNA-sequencing) and promoter methylation (assessed by 450k array) was found, for all of the targets. As a proof of concept, we demonstrated the sensitivity of TGCT cell lines to Olaparib, which associated with differential methylation levels of a subset of targets, namely BRCA1 and RAD51C. Our findings support the use of HR genes promoter methylation as a predictor of the therapeutic response to PARPis in patients with TGCT." @default.
- W3125962341 created "2021-02-01" @default.
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- W3125962341 date "2021-03-02" @default.
- W3125962341 modified "2023-10-14" @default.
- W3125962341 title "Promoter methylation of DNA homologous recombination genes is predictive of the responsiveness to PARP inhibitor treatment in testicular germ cell tumors" @default.
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- W3125962341 doi "https://doi.org/10.1002/1878-0261.12909" @default.
- W3125962341 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8024740" @default.
- W3125962341 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33513287" @default.
- W3125962341 hasPublicationYear "2021" @default.
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