DROSHA and lung cancer: The genes showing the highest average level of copy number include miR-30d, miR-30a, miR-21, miR-205, miR-17, miR-155 as well as DROSHA and DICER1. Surprisingly, the average copy number and the frequency of amplifications of some of these genes (e.g., DROSHA, miR-30d, miR-30a and miR-21) are substantially higher than the corresponding values of well-known lung cancer-related oncogenes, EGFR and MET, analyzed in the same set of samples.