Gene Expression Profiling Identifies Two Chordoma Subtypes Associated with Distinct Molecular Mechanisms and Clinical...

Area of Science:

• Oncology
• Genomics
• Molecular Biology

Background:

• Chordoma is a rare bone tumor with a high recurrence rate.
• Limited treatment options exist for chordoma.
• Understanding molecular heterogeneity is crucial for improved clinical management.

Purpose of the Study:

• To identify molecular subtypes of chordoma.
• To improve clinical management strategies for chordoma.
• To elucidate subtype-specific tumorigenesis.

Main Methods:

• RNA sequencing of 48 Chinese skull-base chordoma tumors.
• Replication of subtype classification using NanoString in 48 North American chordoma patients.
• Immunohistochemistry (IHC) staining of differentially expressed genes in 312 Chinese chordoma patients.

Main Results:

• Two major molecular subtypes of chordoma were identified.
• Subtype 1: associated with somatic mutations and reduced chromatin remodeling gene expression (e.g., PBRM1, SETD2).
• Subtype 2: characterized by upregulation of epithelial-mesenchymal transition and Sonic Hedgehog pathways; PTCH1 expression linked to survival outcomes.

Conclusions:

• Findings enhance understanding of chordoma tumorigenesis.
• Molecular subtypes can inform clinical prognostication.
• Potential for developing targeted therapeutic options based on identified subtypes.