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  • Title: Prognostic value of lymph node-to-primary tumor standardized uptake value ratio in endometrioid endometrial carcinoma.
    Author: Chung HH, Cheon GJ, Kim JW, Park NH, Song YS.
    Journal: Eur J Nucl Med Mol Imaging; 2018 Jan; 45(1):47-55. PubMed ID: 28828510.
    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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