On the other hand, miR-15b-5p is encoded by the MIR15B gene, located on 3q25.33, and widely involved in the pathogenic mechanisms of several conditions, such as Alzheimer’s and Parkinson’s diseases, cerebral stroke, and diabetic complications, as well as having a dual role (oncogenic and tumor suppressor) in cancer [78]. This evidence concerns the gene MIR15B and Parkinson disease.