Plasma miRNA expression profile in pediatric pineal pure germinomas

Area of Science:

• Oncology
• Molecular Diagnostics
• Pediatric Cancer Research

Background:

• Pure germinomas constitute 40% of pineal tumors and typically require biopsy for diagnosis due to absent tumor markers.
• MicroRNAs (miRNAs) show promise as non-invasive biomarkers for germ cell tumors, potentially aiding in the diagnosis of pure pineal germinomas.

Purpose of the Study:

• To investigate the potential of plasma microRNA (miRNA) expression profiling for the non-invasive diagnosis of pure pineal germinomas in pediatric patients.
• To identify specific miRNA signatures that can differentiate pure germinomas from other pineal region tumors.

Main Methods:

• Retrospective analysis of plasma samples from 39 pediatric patients with pineal region tumors.
• Plasma miRNA profiling and differential expression analysis using DESeq2.
• Receiver operating characteristic (ROC) curve analysis to evaluate diagnostic performance.

Main Results:

• Three differentially expressed miRNAs (miR-143-3p, miR-320c, miR-320d) were identified between pure germinomas and other pineal tumors (adjusted p < 0.05).
• The identified miRNA signature demonstrated strong discriminatory power (AUC 90.7%, p < 0.001) with 25% sensitivity and 100% specificity.
• The study included 12 pure germinomas and 27 other pineal region tumors (e.g., pineoblastoma, glioma, atypical teratoid rhabdoid tumor).

Conclusions:

• A three-plasma miRNA signature can potentially non-invasively detect pure pineal germinomas.
• This diagnostic approach may enable selected patients to avoid surgical complications associated with tumor biopsy.
• Further validation is warranted to establish this miRNA signature as a reliable diagnostic tool.