GPX3 and cervical carcinoma: Glutathione peroxidase 3 (GPX3) was the member of the glutathione peroxidase family of selenoproteins, GPX3 promoter methylation was one of the main causes of downregulated GPX gene expression in cervical cancer and acted as a predictive biomarker for lymph node metastasis and prognosis in cervical cancer [45].