Animal experiment was approved by the Animal Research Committee of Xuzhou Central Hospital. Tumor xenograft model was established using BALB/c nude mice by subcutaneously injecting 2 × 106 miR-663 or miR-NC transfected SKOV3 cells. Tumor volume was monitored once every 3 days by assess the tumor width and length. The formula of tumor volume is (length × width2)/2. After 25 days, tumor mass were exfoliated and weighed.
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