Whole-Genome and Epigenomic Landscapes of Etiologically Distinct Subtypes of Cholangiocarcinoma

Study ID Alternative Stable ID Type
EGAS00001001653 Other

Study Description

Cholangiocarcinoma (CCA) is a hepatobiliary malignancy exhibiting high incidence in countries with endemic liver-fluke infection. We analyzed 489 CCAs from 10 countries, combining whole-genome (71 cases), targeted/exome, copy-number, gene expression, and DNA methylation information. Integrative clustering defined 4 CCA clusters-fluke-positive CCAs (clusters 1/2) are enriched in ERBB2 amplifications and TP53 mutations; conversely, fluke-negative CCAs (clusters 3/4) exhibit high copy-number alterations and PD-1/PD-L2 expression, or epigenetic mutations (IDH1/2, BAP1) and FGFR/PRKA-related gene rearrangements. Whole-genome analysis highlighted FGFR2 3' untranslated region deletion as a mechanism of FGFR2 upregulation. Integration of noncoding promoter mutations with protein-DNA binding profiles demonstrates pervasive modulation of H3K27me3-associated sites in CCA. Clusters 1 and 4 exhibit distinct DNA hypermethylation patterns targeting either CpG islands or shores-mutation signature and subclonality analysis suggests that these reflect different mutational pathways. Our results ... (Show More)

Study Datasets 3 datasets.

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Dataset ID Description Technology Samples
Cholangiocarcinoma whole genome sequencing data
HiSeq X Ten,Illumina HiSeq 2000,Illumina HiSeq 2500 118
CCA targeted sequencing
Illumina HiSeq 2500 376
This dataset contains whole genome sequencing FASTQ data for 12 cholangiocarcinoma tumor samples, and their matched normal samples. These 12 samples are in addition to 59 samples available in dataset EGAD00001001988, and consist of patients from Thailand, Romania, and Singapore. Paired-end sequencing data was generated by Illumina Hiseq 2000 and 2500, with insert sizes of 170 and 350.
Illumina HiSeq 2000,Illumina HiSeq 2500 24

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