The Aberrant Expression Levels of miR-423-5p and miR-664b-5p in Peripheral Blood of Patients With Familial and Sporadic Ovarian Carcinoma

Abstract MicroRNAs (miRNAs), are endogenous noncoding single strand RNA molecules with approximate length of 22 nucleotides. Ovarian cancer is a heterogenous disease which includes different biologic behaviors in the clinical, and molecular level. miRNAs have roles in the early diagnosis, prognosis, and chemotherapy sensitivity for ovarian cancer, and in the regulation of reproduction by being expressed in the ovaries. The expression level of two miRNAs of miR-423-5p, and miR-664b-5p selected from the miRNAs which were detected to be important for the ovarian cancer etiology in our previous studies were investigated in the peripheral blood of familial and sporadic ovarian cancer patients, and in healthy individuals. The expression analyses were statistically evaluated with SPSS v21.0 program using the Quantitative Real-Time PCR technique. A statistically significant difference was detected for both miRNAs between the healthy controls and ovarian cancer patient groups (p:0.000). The miR-423-5p expression was detected to increase 2.35 fold, and miR-664b-5p was detected to increase 2.47 fold in ovarian cancer patients compared with the levels in the control group. miR-423-5p was reported to be overexpressed in various cancer types, and in different disease stages in previous study, and miR-423-5p was demonstrated to have increased in the lymphocytes in the peripheral circulation of ovarian cancer patients first in our literature. The miR-664b-5p expression level was detected in high levels in ovarian cancer patient group, however was detected to have decreased in 64% of ovarian cancer patients with BRCA mutation carrier. The expressions of both miRNA molecules were detected to have decreased in the ovarian cancer subgroups in patients with ovarian cancer with addition of a second primary cancer of endometrium cancer, however, were detected in the highest level in ovarian cancer patients in addition to another secondary cancer except breast and endometrium cancer. The results obtained from the study showed that the increased expression of both miRNA molecules were suggested to be associated with ovarian cancer, and decrease was suggested to be associated with endometrium cancer. In summary, the miRNA molecules in the present study might be the non-invasive biological indicator in ovarian cancer, and the demonstration of these molecules on the tumor tissue, and their change during treatment in future studies will be beneficial.