Considering however the pleiotropic character of many miRNA genes regulating multiple targets, some of the CMC miRNA genes still may have distinct functions in specific cancer types or in specific conditions and may play a role in other non-cancer diseases, for example, MIR34A, which plays an important role in cancer also plays a role in neurodegenerative diseases and regulation of the immune system (75,76). This evidence concerns the gene MIR34A and cancer.