Abstract
To extensively explore microRNA expression profiles in lung carcinoids in correlation with clinical and pathological features. A PCR-based array was employed in the screening phase to analyze 752 microRNAs in a discovery set of 12 lung carcinoids, including 6 typical (3 with lymph node metastasis) and 6 atypical (3 with lymph node metastasis). The results were validated by means of real-time PCR in 37 carcinoids, including 22 typical (4 with lymph node metastasis) and 15 atypical (7 with lymph node metastasis), and 19 high-grade neuroendocrine carcinomas. Unsupervised cluster analysis segregated the pilot cases into 3 distinct groups. Twenty-four microRNAs were differentially regulated in atypical versus typical carcinoids, and 29 in metastatic versus nonmetastatic cases. Eleven microRNAs were selected for validation. All but 1 were significantly different among lung neuroendocrine tumor histotypes. Moreover, 5 (miR-129-5p, miR-409-3p, miR-409-5p, miR-185 and miR-497) were significantly upregulated in typical compared to atypical carcinoids. MiR-409-3p, miR-409-5p and miR-431-5p were also significantly downregulated in carcinoids metastatic to the lymph nodes. Predictive in silico analysis of specific target genes showed that t...Continue Reading
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