Considering that mTOR, an important player in PI3K oncogenic signaling, has been identified as a target molecule of miR-100 [13, 27], and combined use of rapamycin and paclitaxel improves the chemotherapeutic effect of either in breast cancer [28], we also tested whether miR-100 affects the response of breast cancer cells to paclitaxel by targeting mTOR. The gene discussed is MTOR; the disease is breast carcinoma.