MicroRNAs (miRNAs) are~22 nucleotide long, noncoding endogenous RNA molecules with important functions in development, cell differentiation, and regulation of cell cycle and apoptosis and cancer etc. which exert their functions by base pairing with messenger RNAs, thereby regulate proteincoding gene expression. miRNAlet-7a-1 were found to be often down-regulated in human prostate cancer. It had been shown to inhibit prostate cancer growth and development, but the mechanisms for its anticancer activi...