The present invention relates to the discovery that the modulation of particular microRNAs can be employed to inhibit a mesenchymal transition that, in certain instances, correlates with resistance to therapy and recurrence as the corresponding cells acquire properties of stem cells as they start undergoing this transition, as well as with invasiveness, e.g., invasion of certain cells of primary tumors into adjacent connective tissue during the initial phase of metastasis. Accordingly, the identification inhibitors of this mechanism, such as inhibitors of certain microRNAs, disclosed herein, can be used for inhibiting the mesenchymal transition to reduce the invasive nature of certain cells of primary cancerous tumors and, in certain instances, to prevent the recurrence of cancer by inhibiting the induction of stem cell-like features in certain cancer cells.
