KRAS and breast carcinoma: To date, let-7 has been reported to target HRAS [19] and KRAS [20], miR-200c and miR-30c target KRAS, miR-148b targets NRAS, miR-7 targets RAF1, miR-206 targets RASA1 and miR-21 targets SPRED1 in breast cancer cells [18].