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- W2591160448 abstract "213 Background: Previous reports on mutations in the isocitrate dehydrogenase 1 (IDH1) gene in prostate cancer focused on the evolutionarily conserved residue R132 located in the substrate binding site of IDH1. One study reported R132 mutations in 2/75 (2.7%) prostate cancers, whereas the other study did not find R132 mutation in 4 prostate cancers. We therefore studied the IDH1 mutations in our prostate cancer targeted exon sequencing database. Methods: Targeted exon sequencing was performed on 52 treatment naïve prostate cancers as part of Moffitt Cancer Center’s Total Cancer Care initiative. The coverage was set to be at least 50 fold. 51/52 samples are primary prostate cancer obtained during radical prostatectomy and 1 sample is a brain metastasis. The 1000 Genomes and the NHLBI Exome Sequencing Project (ESP) were used to exclude likely polymorphisms. The catalogue of somatic mutations in cancer (COSMIC) was used to identify mutations seen in other sequencing projects, and Polyphen2 was used to predict the potential detrimental effect of the amino acid changes predicted from the genetic mutations. Results: 1/51 (2%) primary prostate cancers harbor the R132H mutation, which is known to generate the oncometabolite, (R)-2-hydroxylutarate. Y183C was identified in 1/51 samples. This amino acid change in exon 6 of IDH1 is seen at 1% allele frequency in 1000 Genomes and ESP-euro. It is classified as probably_damaging with a PolyPhen2 score of .999. Another probably_damaging amino acid change is T325M mutation, which is identified in a different primary prostate cancer. V178I in IDH1 was also identified and is thought to be an inherited variant, given it has an allele frequency of 4% in 1000 Genomes, 5% in ESP-european, and 8% in ESP-African-American. Among the frequent gene mutations in metastatic prostate cancer, only a missense mutation in the androgen receptor (H875Y) was identified in the treatment naïve brain metastasis. This H875Y has been linked to promiscuous androgen receptor. Conclusions: Mutations in IDH1 R132H and other “probably_damaging” amino acid changes are identified in primary prostate cancers. This holds further implications for future studies on prostate cancer, and may point to an interesting target in the disease." @default.
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- W2591160448 date "2014-02-01" @default.
- W2591160448 modified "2023-09-26" @default.
- W2591160448 title "IDH1 mutation in prostate cancer: R132H and beyond." @default.
- W2591160448 doi "https://doi.org/10.1200/jco.2014.32.4_suppl.213" @default.
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