Molecular classification of ovarian high-grade serous/endometrioid carcinomas through multi-omics analysis: JGOG3025-TR2 study
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View abstract on PubMed
Summary
This summary is machine-generated.Ovarian high-grade endometrioid carcinoma (HGEC)-type tumors, identified within high-grade serous carcinoma (HGSC) diagnoses, show favorable prognosis and endometrial differentiation, not homologous recombination deficiency (HRD). These findings aid in distinguishing HGEC from HGSC.
Area Of Science
- Gynecologic Oncology
- Cancer Genomics
- Molecular Pathology
Background
- Histopathological similarities between ovarian high-grade endometrioid carcinoma (HGEC) and high-grade serous carcinoma (HGSC) cause diagnostic variability.
- Homologous recombination deficiency (HRD) is linked to drug sensitivity in HGSC, but HGEC molecular features remain unclear.
Purpose Of The Study
- To molecularly characterize ovarian tumors with HGEC features within HGSC diagnoses.
- To identify distinct molecular subtypes within HGSC and their clinical implications.
Main Methods
- Targeted DNA sequencing, RNA sequencing, DNA methylation array, and SNP array were performed on ovarian HGEC and HGSC samples.
- Unsupervised clustering based on copy number signatures was used to group tumors.
- Analysis included cohorts from JGOG-TR2, TCGA-OV, and TCGA-UCEC.
Main Results
- Four tumor groups (C1-C4) were identified. C4, termed "HGEC-type" tumors, showed favorable outcomes, higher HGEC proportion, low HRD scores, and a normal endometrium-like DNA methylation profile.
- HGEC-type tumors lacked BRCA1/2 alterations and CCNE1 amplification.
- These HGEC-type tumors were also found in TCGA-OV and TCGA-UCEC datasets.
Conclusions
- Ovarian "HGEC-type" tumors represent a distinct molecular subtype within HGSC diagnoses.
- "HGEC-type" tumors are characterized by non-HRD status, favorable prognosis, and endometrial differentiation.
- These findings suggest a potential reclassification of a subset of clinically diagnosed HGSCs.
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