Subsequently, Ru et al. showed that miR-29b overexpression in PCa cell lines limits metastasis, but this study did not focus on collagen genes or MMP-2 and finally Yan et al. [8] employed only LnCaP cells to report that miR-29b upregulation inhibits metastasis and that MMP-2 was not involved in this issue. The gene discussed is MMP2; the disease is posterior cortical atrophy.