Genomic and transcriptomic analysis of thymic epithelial tumors

Thymic epithelial tumors (TETs), comprising various histologic types of thymomas and thymic carcinomas, originate from thymic epithelial cells. Each histologic type is typically associated with a distinct immune cell composition and clinical manifestation. A better understanding of the cellular origins and molecular pathways underlying this heterogeneity is needed to improve patient stratification and treatment. Here, we conducted an integrated genomic and transcriptomic analysis of 124 thymomas and 13 thymic carcinomas, including 20 newly sequenced cases combined with 117 cases from publicly available datasets. This approach stratified TETs into three subgroups with different possible origins: GTF2I-mutant (GTF2I-type) thymomas, copy number-altered (CN-type) thymomas, and thymic carcinomas.

Type: Cancer Genomics
Archiver: European Genome-Phenome Archive (EGA)

3 Datasets

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Dataset ID	Description	Technology	Samples
EGAD50000001158	Between November 2010 and May 2014, 20 cases—17 thymomas and 3 thymic carcinomas (including 2 squamous and 1 neuroendocrine carcinoma)—were newly sequenced from surgically removed TETs at Seoul National University Hospital, with written informed consent. Tumors and normal tissues were carefully separated and immediately preserved in liquid nitrogen after resection. DNA and RNA were extracted from the tumors, adjacent normal tissues, and/or blood samples. Libraries for RNA-seq were prepared using the TruSeq Stranded mRNA LT Sample Prep Kit following standard Illumina protocols.	Illumina HiSeq 2500	40
EGAD50000001159	Between November 2010 and May 2014, 20 cases—17 thymomas and 3 thymic carcinomas (including 2 squamous and 1 neuroendocrine carcinoma)—were newly sequenced from surgically removed TETs at Seoul National University Hospital, with written informed consent. Tumors and normal tissues were carefully separated and immediately preserved in liquid nitrogen after resection. DNA and RNA were extracted from the tumors, adjacent normal tissues, and/or blood samples. Libraries for WES were prepared using the SureSelect XT (Human All Exon + UTR v5) Library Prep Kit following standard Illumina protocols.	Illumina HiSeq 2500	40
EGAD50000001160	Among the 20 newly sequenced cases, we conducted additional whole-genome sequencing (WGS) on five out of eight CN-type thymomas, excluding three with low tumor cell fractions (< 0.1). Libraries for WGS were prepared using the TrueSeq DNA PCR-free Prep Kit following standard Illumina protocols.	HiSeq X Ten	10