Tumor size, depth of invasion, and histologic grade as prognostic factors of lymph node involvement in endometrial cancer: a SEER analysis.

Objectives: The objective of this investigation was to evaluate the risk of nodal metastasis in patients with endometrial cancer, using the Mayo criteria, in a population-based analysis.
Materials and Methods: Data from the SEER registry was reviewed for endometrial cancer cases diagnosed between 1988 and 2010. Patients were considered at low-risk for nodal metastasis if their tumors were histologic grade 1 or 2, myometrial invasion was less than 50%, and tumor size equal to or less than 2 cm. Patients not meeting these criteria were considered at high-risk for nodal involvement.
Results: The final study group consisted of 19,329 women with surgically staged endometrial cancer. Of these, 1035 (5.3%) had lymph node involvement. Based on Mayo criteria, 4095 (21.1%) patients were found to be at low-risk and 15,234 (78.9%) at high-risk for nodal metastasis. Low-risk features were associated with a 1.4% risk for lymph node metastasis, compared to 6.4% in patients with high-risk features (p<0.001). When myometrial invasion was removed from the analysis, low-risk pathologic features were associated with a 2.4% risk of lymph node metastasis, compared to 10.4% in patients with high-risk features (p<0.001).
Conclusions: In a population-based analysis, women with low-risk endometrial cancer, as defined by the Mayo criteria, have a low rate of lymph node metastasis.
(Copyright © 2014 Elsevier Inc. All rights reserved.)