To Explore the Feasibility of Dynamic Changes of TCR Diversity in Peripheral Blood in Monitoring Recurrence and Evaluating Prognosis of Epithelial Ovarian Cancer

Inclusion Criteria: * Newly diagnosed patients with advanced EOC, 18-75 years of age: including patients with preoperative assessment of stage III-IV EOC, who underwent initial tumour cytoreduction and 6-8 courses of postoperative chemotherapy with paclitaxel + carboplatin/docetaxel + carboplatin; * Eastern Cooperative Oncology Group (ECOG) physical strength status (PS) score of 0 or 1; * Cooperation in the treatment process by providing clinicopathological data and imaging data required for the study process; * Cooperate with follow-up visits and collection of node blood for clinical efficacy assessment, and agree to use the test data for subsequent research and product development. * The initial and follow-up treatment processes are in accordance with NCCN guidelines; Exclusion Criteria: * Neoadjuvant chemotherapy patients; * Splenectomy patients; * Patients with contraindications to radiotherapy; * Any other patients who, in the judgement of the investigator, may have poor compliance with the procedures and requirements of the study; * Unacceptable or unavailable means of assessing specified efficacy such as imaging; * Vaccination within 2 months; antibiotics for infection within 2 weeks; history of blood transfusion within 2 weeks; * Long-term use of recombinant human erythropoietin, recombinant human interleukin, Ricodin tablets and other drugs affecting the composition of blood cells; * Severe organ dysfunction; * Infectious diseases such as immunodeficiency syndrome, active tuberculosis, HIV infection, and other infectious diseases not suitable for participation; * Pre-cancerous diseases of the blood, such as myelodysplastic syndromes; * Have received immunosuppressive therapy within 2 weeks; * Suffering from blood clotting disorders.