Epithelial Ovarian Cancer Staging and Surgery
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Direct answer
Epithelial ovarian cancer is staged surgically using the FIGO system, which runs from disease confined to the ovaries in stage I, through pelvic and abdominal spread in stage III, to distant metastasis in stage IV. Staging requires a comprehensive laparotomy with hysterectomy, bilateral salpingo-oophorectomy, omentectomy, peritoneal washings and nodal assessment. Treatment combines optimal cytoreduction, leaving no residual nodule over 1 cm, with platinum and taxane chemotherapy.
What you must remember
- Stage I: confined to the ovaries, with IC denoting surgical spill, capsule rupture before surgery, surface tumour or malignant ascites or washings.
- Stage II: pelvic extension to the uterus, tubes or other pelvic tissues.
- Stage III: peritoneal spread beyond the pelvis or retroperitoneal nodes; IIIA1 is nodes alone, IIIB deposits up to 2 cm, and IIIC deposits over 2 cm, with or without nodes (FIGO 2014).
- Stage IV: distant metastasis, including liver or spleen parenchyma, or pleural effusion with positive cytology.
- Optimal cytoreduction: residual disease of no more than 1 cm, which is the strongest surgical prognostic factor.
- Standard chemotherapy: carboplatin with paclitaxel, usually six cycles for most advanced disease.
- Neoadjuvant chemotherapy: given before interval surgery when primary cytoreduction is not feasible, usually three cycles followed by surgery and further cycles.
- Maintenance: PARP inhibitors are considered in BRCA-mutated or homologous recombination deficient disease after response to chemotherapy.
Staging, cytoreduction and chemotherapy sequence
Management follows a sequence in which surgery defines the stage and chemotherapy treats the residual risk.
- Staging laparotomy: Perform total abdominal hysterectomy, bilateral salpingo-oophorectomy, omentectomy, peritoneal biopsies, washings and pelvic and para-aortic node assessment. Each component is recorded separately, because the stage depends on every finding.
- Cytoreduction: Aim for no macroscopic residual disease, with residual nodules of 1 cm or less defined as optimal. Complete removal is ideal, but optimal debulking is the practical standard.
- Primary chemotherapy: Give six cycles of carboplatin with paclitaxel after surgery when the disease has been resected to an optimal state. Response to this first course shapes later treatment choices.
- Neoadjuvant route: When primary surgery cannot achieve optimal cytoreduction, give three cycles first, then interval debulking followed by further cycles. Interval surgery is then judged on the same optimal standard.
- Early-stage decision: Low-grade stage IA or IB disease may need observation, while stage IC or high-grade disease usually receives adjuvant chemotherapy.
- Maintenance and surveillance: Consider PARP inhibitor maintenance in appropriate biomarker groups, with follow-up of symptoms and CA-125 for response.
Where surgery and chemotherapy get confused
Staging questions usually test the order of surgery and chemotherapy and the meaning of optimal.
- Trap: Treating stage IC as stage I with observation only Correct: IC denotes capsule rupture or malignant washings, and it usually receives adjuvant chemotherapy.
- Trap: Calling a resection complete because the visible tumour was removed Correct: optimal cytoreduction means residual disease of 1 cm or less, while complete means no macroscopic disease.
- Trap: Omitting omentectomy and washings during staging Correct: these are part of the staging laparotomy and affect both stage and treatment.
- Trap: Choosing neoadjuvant chemotherapy by default Correct: primary surgery is preferred when optimal cytoreduction is feasible, and neoadjuvant therapy suits unresectable or unfit patients.
Frequently asked questions
What is the difference between FIGO stage IC and IIIC ovarian cancer?
Stage IC is disease confined to the ovaries but with capsule rupture, surface involvement or malignant ascites or washings. Stage IIIC involves peritoneal metastases larger than 2 cm beyond the pelvis, with or without nodes, which carries a worse prognosis. Retroperitoneal nodal disease alone is IIIA1 in FIGO 2014.
What does optimal cytoreduction mean in epithelial ovarian cancer?
Optimal cytoreduction means that no residual tumour nodule larger than 1 cm remains after surgery. Residual disease size is one of the strongest surgical prognostic factors, so surgeons aim to leave none.
When is neoadjuvant chemotherapy used in advanced ovarian cancer?
Neoadjuvant chemotherapy is used when primary surgery cannot achieve optimal cytoreduction, or when the patient is unfit for extensive surgery. Typically three cycles are given, followed by interval debulking surgery and further cycles.
What is the standard first-line chemotherapy for epithelial ovarian cancer?
Carboplatin with paclitaxel, given for six cycles, is the standard first-line chemotherapy for most epithelial ovarian cancers. Maintenance with a PARP inhibitor may follow in women with BRCA mutations or homologous recombination deficiency.