Effect of miR-142-3p on ovarian cancer cell proliferation and chemoresistance. SKOV3 cells were transfected with miR-142-3p mimic or miR-NC, respectively, and non-transfected SKOV3 cells were used as the control group. Post-transfection, (A) RT-qPCR was used to determine miR-142-3p expression levels. **P<0.01 vs. Control. (B) An MTT assay was conducted to examine cell proliferation. **P<0.01 vs. miR-NC. Subsequently, SKOV3/DDP cells were transfected with miR-142-3p mimic or miR-NC, respectively, and non-transfected SKOV3/DDP cells were used as the control group. Post-transfection, (C) RT-qPCR was used to determine the miR-142-3p levels. **P<0.01 vs. Control. (D) An MTT assay was conducted to examine cell proliferation. **P<0.01 vs. miR-NC. miR, microRNA; NC, negative control (scrambled); RT-qPCR, reverse transcription-quantitative polymerase chain reaction; SKOV3/DDP, cisplatin-resistant SKOV3 cells.