Circulating Pre-microRNA-488 in Blood Is a Potential Prognostic Biomarker in Gastric Cancer

Area of Science:

• Oncology
• Molecular Biology
• Biomarker Discovery

Background:

• MicroRNAs (miRNAs) are emerging as non-invasive biomarkers in liquid biopsies.
• Gastric cancer (GC) diagnosis and prognosis can be improved by identifying novel biomarkers.

Purpose of the Study:

• To investigate the clinical significance of circulating precursor-miR-488 (pre-miR-488) and miR-488-5p in gastric cancer patients.
• To evaluate their potential as prognostic biomarkers in GC.

Main Methods:

• Quantitative reverse transcription PCR (RT-qPCR) to measure pre-miR-488 and miR-488-5p expression in tumor tissues and blood.
• Gene Set Enrichment Analysis (GSEA) on TCGA dataset for pathway analysis.
• Exosomal pre-miR-488 detection in patient plasma.

Main Results:

• Both pre-miR-488 and miR-488-5p were downregulated in GC tumor tissues but upregulated in the blood of GC patients compared to healthy controls.
• Low blood expression of pre-miR-488 or miR-488-5p correlated with poor prognosis in GC patients.
• Low pre-miR-488 blood expression was an independent predictor of poor overall survival; miR-488-5p showed negative correlation with epithelial-mesenchymal transition and hypoxia pathways. Pre-miR-488 was found in exosomes.

Conclusions:

• Circulating pre-miR-488 and miR-488-5p show potential as novel prognostic biomarkers for gastric cancer.
• These miRNAs could aid in predicting clinical outcomes and guiding therapeutic strategies for GC patients.