**4. miRNA vs. siRNA for gene silencing in treatment of breast cancer**

Current research on the drugs that silence genes has provided important insights into the possible value usefulness of these drugs for the treatment of various types of cancer. A number of mRNA targets, as well as interference in mRNA functions by miRs, will almost certainly make major contributions to our understanding and treatment of many diseases. Thus, the clinical application of miRs as diagnostic biomarkers is developing at a rapid pace, with the gene silencing effect of siRNAs on specific genes making them ideal tools for target identification and validation in drug discovery and development.
