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P1.01 - Advanced NSCLC (ID 757)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
P1.01-074 - Exosomal RNA-Profiling of Lung Pleural Effusions Identifies Adenocarcinoma Patients through Elevated miR-200 Expression (ID 8919)
09:30 - 16:00 | Author(s): P. Hååg
The inherent challenges associated with lung tissue biopsies have spurred an enormous interest in the use of liquid biopsies. Pleural effusions are one such liquid biopsy which may enable lung cancer profiling and also assess if the patient suffers from a benign or malignant process in the lungs. Recently extracellular vesicles of endocytic origin, exosomes, have attracted interest as liquid biopsy of tumors since they can be used to look at tumor derived mutations as well as tumor cell activity represented by the RNA transcriptome. The RNA cargo carried in exosomes is known to resemble the RNA profile of the primary tumor. Here we aimed to analyze if microRNA and targeted cancer mRNA profiling of exosomes isolated from pleural effusions could decipher biomarkers associated with lung adenocarcinoma.
A systematic microRNA profiling of matured processed microRNAs along with targeted cancer mRNA profiling was carried out on extracellular vesicles, including exosomes, derived from 36 clinical pleural effusions, separated into 18 benign and 18 lung adenocarcinoma samples. Benign pleural effusion consisted of unspecific inflammation in the majority of cases. The two groups were well balanced with respect to age (median = 72Y) and smoking history (ever smokers in circa 70% of cases). However, males were overrepresented in the benign group (83% vs 44%). Both microRNA and mRNA profiling was conducted using TaqMan RT-qPCR Open Arrays (containing 800 genes each) followed by statistical ranking (Wilcoxon test) of differentially regulated transcripts between the two patient groups.
Systematic RNA profiling revealed a substantial, and highly significant (p<0.0001), elevated expression of all members from the extended miR-200 family in pleural effusions collected from patients with NSCLC adenocarcinoma. By cross-analyzing the obtained microRNA profiling data to the mRNA cancer panel expression, statistical enrichment between miR-200 family members and predicted miR-200 target genes, including PIK3CA, NOTCH1 and KRAS was observed (Fisher’s exact test, p=0.0105).
Our study demonstrates the usage of exosomal RNA profiling from pleural effusions to define patients with lung adenocarcinoma and further highlights miR-200 microRNAs as diagnostic markers in lung cancer liquid biopsies. Acknowledgment: This study was supported from the following funding bodies: Swedish Cancer Society, Stockholm Cancer Society, Stockholm County Council, Knut and Alice Wallenberg Foundation and Erling Persson Family Foundation.
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