Correlation analysis showed that plasma levels of MIR4435-2HG and TGF-β1 were positively correlated only in OC patients. qPCR and western blot analysis results showed that MIR4435-2HG overexpression led to upregulation of TGF-β1 in OC cells, while TGF-β1 treatment did not significantly affect MIR4435-2HG expression.