For example, miR-15a as a tumor suppressor can target multiple oncogenes such as BCL2, MCL1, CCND1, and WNT3A, and plays a role in cancers such as Chronic Lymphocytic Leukemia (CLL), pituitary adenomas, and prostate carcinoma [16,17,18]. This evidence concerns the gene CCND1 and B-cell chronic lymphocytic leukemia.