RESUMEN
Objective To investigate the expression of metastasis-associated lung adenocarcinoma transcript 1 (MALAT1) in endometriosis (EMS) and its diagnostic value.Methods The information of EMS gene expression was collected from Gene-Cloud of Biotechnology Information (GCBI) and analyzed,in which MALAT1 gene was screened out accordingly.The total RNAs were extracted from tissues and serum samples of the patients with ovarian endometriosis and non-endometriosis and the expression of MALAT1 was detected by real-time quantitative PCR.The correlation between MALAT1 expression level and menstrual cycle was analyzed.The differential diagnostic efficacy of serum MALAT1 levels was analyzed by receiver operating characteristic (ROC) curve.Results Compared with the non-EMS group the expression of MAL4T1 gene was down-regulated by 1.35-fold (t =-3.27,P ＜ 0.01) in EMS group according to gene information analysis of GCBI.The relative expression levels of MALAT1 in ectopic and eutopic endometrium of patients with ovary endometriosis (0.41 ±0.18 and 0.61 ± 0.12) were significantly lower than those in non-endometriosis patients (1.05 ±-0.34,t =5.87 and 4.48,P ＜ 0.01).However,the expression level of MALAT1 was not related with menstrual cycle of the patients with ovarian endometriosis and non-endometriosis (t =1.54 and 1.52,P ＞ 0.05).The expression of MALAT1 in ectopic ovarian cysts was significantly lower than that in eutopic endometrium of ovary endometriosis (t =3.77,P ＜ 0.01).The relative expression of serum MALAT1 in ovary endometriosis (0.60 ±0.18) was significantly lower than that in non-endometriosis (1.05 ± 0.32,t =5.18,P ＜ 0.01).The area under the curve (AUCsOc) was 0.88.When the cut-off value of serum MALAT1 level was set as 0.74,the sensitivity and specificity of expression level of MALAT1 were 82.4％ and 92％ respectively,and Youden's index was 74.4％.Conclusion Low expression of MALAT1 in endometriosis may be related with occurrence and development of endometriosis.Serum MALAT1 level may have certain differential diagnostic value for EMS.