Ribonucleic acid microarray analysis from lymph node samples obtained by endobronchial ultrasonography-guided...

Area of Science:

• Pulmonary Medicine
• Molecular Biology
• Oncology

Background:

• Endobronchial ultrasonography-guided transbronchial needle aspiration (EBUS-TBNA) is a minimally invasive technique for obtaining lung tissue samples.
• Accurate molecular profiling of lung tumors is crucial for diagnosis and targeted therapy.

Purpose of the Study:

• To assess the feasibility of performing messenger RNA (mRNA) and microRNA (miRNA) expression analysis using microarray on EBUS-TBNA samples.
• To determine if EBUS-TBNA samples yield sufficient quality RNA for comprehensive molecular analysis.

Main Methods:

• Total RNA was isolated from 24 archived EBUS-TBNA samples.
• RNA quality was assessed, and samples meeting the threshold underwent whole transcript (WT) array for mRNA and miRNA expression array analysis.
• Statistical analyses, including ANOVA and hierarchical clustering, were performed to identify differentially expressed genes and miRNAs based on histologic subtypes.

Main Results:

• RNA from 17 out of 24 EBUS-TBNA samples (71%) met the quality threshold for analysis.
• Significant differences in gene expression (WT array) and miRNA expression were observed between histologic subtypes (p<0.01).
• Hierarchical clustering demonstrated discrete sample grouping by histologic subtype, with 16 WT genes and 4 miRNAs identified after multiple testing correction.

Conclusions:

• EBUS-TBNA samples are suitable for comprehensive mRNA and miRNA expression profiling using microarray technology.
• This validates EBUS-TBNA as a valuable source for molecular diagnostics and research in lung cancer.