MIR9-1 and ovarian neoplasm: In addition, in peritoneal metastases, we observed a significant decrease in methylation levels of MIR193A (p = 0.04) and MIR9-1 (p = 0.007, FDR = 0.05), which were significantly hypermethylated both at the stage of the onset of primary ovarian tumors and at the stage of their metastasis.