Prognostic risk factors for lymph node involvement in patients with endometrial cancer.

OBJECTIVE: We aimed to analyze variables affecting lymph node (LN) involvement and to assess the need for systematic lymphadenectomy in patients with endometrial cancer (EC).

MATERIALS AND METHODS: A single centre retrospective analysis was conducted in a total of 128 consecutive patients with EC who underwent systematic pelvic or combined pelvic and paraaortic lymphadenectomy between 2009 and 2012. Mann-Whitney U, chi-square, and Fisher's exact test were used for univariate analyses when appropriate. Variables with a p value <0.05 in the univariate analysis were included into a multivariate logistic regression analysis. The effects of variables on LN involvement are reported using adjusted odds ratios (ORs) and 95% confidence intervals (CI).

RESULTS: In univariate analysis, grade 2-3, tumor size ≥3 cm, deep (≥50%) myometrial invasion, presence of cervical, adnexal or omental involvement, positive peritoneal cytology, open surgical approach (laparotomy), combined pelvic and paraaortic lymphadenectomy and number of total LNs removed (>30) were found associated with LN involvement. However, the number of total LNs removed (>30) was the only independent variable that predict LN involvement in multivariate analysis [OR: 15.08; 95% CI: (1.28-177.59); p=0.03].

CONCLUSION: This study demonstrates that the more LNs removed during staging of EC, the greater the probability of finding LN metastasis.