DOI: 10.1007/s00259-017-3805-2Pages: 1-9

Prognostic value of lymph node-to-primary tumor standardized uptake value ratio in endometrioid endometrial carcinoma

1. Seoul National University College of Medicine, Department of Obstetrics and Gynecology, Cancer Research Institute

2. Seoul National University College of Medicine, Department of Nuclear Medicine, Cancer Research Institute

Correspondence to:
Hyun Hoon Chung
Email: chhkmj@gmail.com

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Abstract

Purpose

To determine whether the relative metabolic activity of pelvic or para-aortic LN compared with that of primary tumor measured by preoperative [18F]FDG PET/CT scan has prognostic value in patients with endometrioid endometrial carcinoma.

Methods

We retrospectively reviewed patients with endometrioid endometrial carcinoma who underwent preoperative [18F]FDG PET/CT scans. Prognostic values of PET/CT-derived metabolic variables such as maximum standardized uptake value (SUV) of the primary endometrial carcinoma (SUVTumor) and LN (SUVLN), and the LN-to-endometrial carcinoma SUV ratio (SUVLN / SUVTumor) were assessed.

Results

Clinico-pathological data, imaging data, and treatment results were reviewed for 107 eligible patients. Median post-surgical follow-up was 23 months (range, 6–60), and 7 (6.5%) patients experienced recurrence. Regression analysis showed that SUVLN / SUVTumor (P < 0.001), SUVLN (P = 0.003), International Federation of Gynecology and Obstetrics (FIGO) stage (P = 0.006), and tumor grade (P = 0.011) were risk factors of recurrence. Multivariate regression analysis revealed that FIGO stage (P = 0.034) was the independent risk factor of recurrence. SUVLN / SUVTumor showed significant correlation with FIGO stage (P < 0.001), LN metastasis (P < 0.001), lymphovascular space invasion (P < 0.001), recurrence (P = 0.001), tumor grade (P < 0.001), and deep myometrial invasion of tumor (P = 0.022). Patient groups categorized by SUVLN / SUVTumor showed significant difference in progression-free survival (Log-rank test, P = 0.001).

Conclusions

Preoperative SUVLN / SUVTumor measured by [18F]FDG PET/CT was significantly associated with recurrence, and may become a novel prognostic factor in patients with endometrioid endometrial carcinoma.

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  • Accepted: Aug 7, 2017
  • Online: Aug 21, 2017

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