Lymphadenectomy in early-stage ovarian cancer: is there still a role?
The role of systematic pelvic and para-aortic lymphadenectomy in presumed early-stage ovarian cancer remains controversial due to the lack of high-quality prospective evidence. No therapeutic benefit has been confirmed for systematic lymphadenectomy during surgical staging for apparent early-stage ovarian cancer. Lymphadenectomy may improve progression-free survival but has demonstrated no impact on overall survival, except for clear cell ovarian cancer, where a potential survival benefit has been suggested in retrospective studies. Systematic lymphadenectomy retains a diagnostic role in identifying occult nodal metastases (9% to 30% across series) undetected on pre-operative imaging or intra-operative assessment. The decision to perform lymphadenectomy should be individualized based on several factors, including histological sub-type, tumor grade, stage, and biomarker profile. Key considerations include the anticipated risk of lymph node metastasis, the opportunity to tailor adjuvant treatment by either omitting chemotherapy or offering maintenance targeted therapy, peri-operative morbidity, long-term sequelae impacting quality of life (eg, lower limb lymphedema), and cost-effectiveness. Systematic lymphadenectomy is guideline-recommended for high-grade tumors, including high-grade serous, high-grade endometrioid, and clear cell histologies, whereas it can be omitted in low-grade endometrioid and expansile mucinous sub-types. Its significance in low-grade serous and infiltrative mucinous ovarian cancers remains unclear, although guidelines frequently advocate for lymphadenectomy in these cases. To optimize patient selection, large-scale prospective studies with proper stratification by histotype and molecular profile are required. Emerging approaches to lymph node assessment, such as sentinel lymph node biopsy, artificial intelligence-assisted pre-operative imaging, and liquid biopsy, hold promise for improving staging accuracy.