Supplementary Material for: Lymph Node Ratio Can Better Predict Prognosis than Absolute Number of Positive Lymph Nodes in Operable Cervical Carcinoma

Background: Nodal status is the most important prognostic factor in cervical cancer. However, further risk stratification in node positive cervical cancer patients is warranted for optimal therapeutic decisions. Material and Methods: Nodal positive patients (n = 86) were retrospectively stratified into two groups according to either number of positive nodes (>3 vs. 1–3) or lymph node ratio (LNR) (≥10 vs. <10% and >6.6 vs. ≤6.6%). Univariable log-rank tests and both univariable and adjusted multivariable Cox regression models were used to evaluate the association between number of positive nodes or LNR and disease-free survival (DFS) and overall survival (OS). Results: LNR was significantly associated with worse DFS in adjusted multivariable analysis, both when categorized as ≥10 versus <10% (HR 2.25, 95% CI 1.06–4.76, p = 0.034) and when categorized as >6.6 versus ≤6.6% (HR 2.79, 95% CI 1.23–6.37, p = 0.015). However, we found no significant association between number of positive nodes or LNR and OS. Discussion:In operable node-positive cervical cancer, both number of positive lymph nodes and LNR can be used for further risk stratification with regard to DFS but not OS.