Publication date: Available online 6 April 2018
Source:Radiotherapy and Oncology
Author(s): Nicholas R. Rydzewski, Margaux J. Kanis, Eric D. Donnelly, John R. Lurain, Jonathan B. Strauss
Background and purposeInguinal lymph node involvement is considered the most important prognostic risk factor for survival in vulvar cancer. However, controversy exists concerning the optimal adjuvant therapy for node-positive disease. This study sought to identify the optimal adjuvant therapy for each subset of women with node-positive disease.Material and methodsThe National Cancer Database (NCDB) was queried to identify women with inguinal node positive vulvar cancer. Survival analysis was performed using log-rank test, the Kaplan–Meier estimates, and Cox proportional hazards to both clarify prognosis and identify the benefit of each treatment modality in individual subsets of women.ResultsA total of 2779 women with inguinal node positive vulvar cancer were identified. On multivariate Cox model hazard ratio, radiotherapy yielded a survival advantage for women with one positive node (HR 0.81, p = 0.027) and two or more positive nodes (HR = 0.59, p < 0.001). The addition of chemotherapy to radiotherapy yielded an incremental improvement in survival for women with 2 or more positive nodes (HR = 0.79, p = 0.022) but not women with 1 positive node (HR = 0.93, p = 0.605).ConclusionsAll patients with node positive disease benefited from radiotherapy. By contrast, only those with 2 or more positive nodes benefited from the addition of chemotherapy to radiotherapy.
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