DLEU1 and cervical squamous intraepithelial neoplasia: Further examination of DLEU1 expression in the serum exosomes of patients with CC, CIN and HCs showed that its expression was significantly upregulated in patients with CC and correlated with tumour size, tumour invasion depth, pathological grade, FIGO stage, lymph node metastasis, and SCC and CA-125 concentrations.