Prognostic factors and a value of 2009 FIGO staging system in vulvar cancer

In 2009, International Federation of Gynecology and Obstetrics (FIGO) modified staging of vulvar cancer-the prognostic significance of the new classification relative to the prior system as well as to the commonly recognized prognostic factors has not been assessed. The aim of this study was to test prognostic ability of 2009 staging in a cohort of uniformly treated and staged cases with long-term follow-up.

Pathologic characteristics were obtained by blind review of the original tissue samples. 76 patients who qualified for surgery on the basis of the same criteria, with full clinical history, were included in the study. The histological analyses were performed on 76 and 35 paraffin-embedded tissue samples from primary tumors and lymph nodes, respectively. Survival analyses included the Kaplan-Meier method, log-rank test and Cox proportional hazards model.

Univariate analysis has demonstrated that age (p = 0.0170), lymph node metastasis (p = 0.0393), tumor grade (p = 0.0086) and FIGO1994 stage (p = 0.001) were the significant prognostic factors for overall survival. Multivariate analysis has demonstrated that growing age (HR 2.25, 95 % CI 0.79-3.71, p = 0.0321), tumor grade (G1 vs. G2 and G3) (HR 1-3.11, 95 % CI 1.6-4.62, p = 0.0057) and FIGO1994 stage (HR 1.78, 95 % CI 0.55-3.01, p = 0.0061) are independent prognostic factors with respect to overall survival.

The results indicate the prognostic advantage of the 1994 FIGO staging as it has become an independent prognostic factor in contrast to the new FIGO system. This should be tested in future larger cohort studies. Differentiation grade turned out to be a very valuable independent prognostic factor and should be incorporated as a routine component of the histopathologic reports in vulvar cancer.