Objective To investigate the expression levels of circular RNA (circRNA) ATRNL1 and follistatin (FST) in peripheral blood of patients with endometrial polyp (EP), and to evaluate their ability to predict recurrence within 6 months after hysteroscopic electrosurgical resection.
Methods A total of 85 patients with EP who underwent hysteroscopic resection at the People′s Hospital of Danyang from January to April in 2024 were enrolled and followed up for 6 months postoperatively. A retrospective analysis was conducted. According to whether the patients experienced a recurrence of EP within 6 months after surgery, they were divided into recurrence group (n=12) and non-recurrence group (n=73). The t test and chi-square test were applied to compare the general clinical data and serum levels of circATRNL1 and FST between two groups. Additionally, serum follicle-stimulating hormone (FSH), estradiol, luteinizing hormone (LH), relative expression levels of transforming growth factor (TGF)-β and vascular endothelial growth factor (VEGF) in endometrial tissue, as well as endometrial thickness before and 6 months after surgery, were compared inter-group and intra-group. Multivariate unconditional logistic regression analysis was conducted to identify independent risk factors for postoperative recurrence. Receiver operating characteristic (ROC) curves were constructed to assess the predictive value of serum circATRNL1 and FST individually and in combination. This study was approved by the Ethics Committee of the People′s Hospital of Danyang (Approval No. 20250430), and informed consent was obtained from all participants.
Results ① Serum circATRNL1 and FST levels of EP patients in recurrence group were higher than those in non-recurrence group, and the differences were statistically significant (P<0.05). ② Inter-group comparison showed that at 6 months after surgery, the serum levels of FSH, estradiol, and LH, relative expression level of TGF-β in endometrial tissue, and endometrial thickness of EP patients in recurrence group were higher or thicker than those in non-recurrence group, and the differences were statistically significant (P<0.05). Intra-group comparison showed that, in both groups, these 5 parameters above as well as relative expression level of VEGF in endometrial tissue at 6 months after surgery were lower than those before surgery, and the differences were statistically significant (P<0.05). ③ Multivariate unconditional logistic regression analysis demonstrated that elevated serum circATRNL1 level (OR=4.080, 95%CI: 1.745-9.539, P=0.005), elevated serum FST level (OR=4.536, 95%CI: 1.939-10.605, P=0.004), elevated serum FSH level (OR=4.563, 95%CI: 1.952-10.669, P=0.006), elevated serum estradiol level (OR=5.028, 95%CI: 2.150-11.756, P=0.006), elevated serum LH level (OR=4.604, 95%CI: 1.969-10.765, P=0.003), higher expression level of TGF-β in endometrial tissue (OR=4.865, 95%CI: 2.081-11.374, P=0.002), and greater endometrial thickness (OR=4.914, 95%CI: 2.101-11.488, P=0.007) were all independent risk factors for EP recurrence within 6 months after surgery. ④ ROC curve analysis showed that the sensitivity of serum circATRNL1 level, serum FST level, and their combination in predicting EP recurrence within 6 months after hysteroscopic resection were 75.0%, 72.2%, and 75.0%, respectively, while the specificity values were 76.7%, 64.4%, and 84.9%, respectively. The corresponding area under the curve (AUC) were 0.819 (95%CI: 0.738-0.899), 0.724 (95%CI: 0.615-0.833), and 0.842 (95%CI: 0.759-0.925), respectively.
Conclusions Abnormally elevated levels of circATRNL1 and FST in peripheral blood are associated with the progression of EP, and demonstrate potential value in predicting EP recurrence within 6 months after hysteroscopic resection.