The Reproducibility of a Binary Tumor Grading System for Uterine Endometrial Endometrioid Carcinoma, Compared with FIGO System and Nuclear GradingSagae S.a · Saito T.a · Satoh M.b · Ikeda T.b · Kimura S.b · Mori M.c · Sato N.b · Kudo R.a
Departments of aObstetrics and Gynecology, bPathology and cPublic Health, Sapporo Medical University, School of Medicine, Sapporo, Japan
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Objective: A binary grading system has been proposed to assess the amount of solid growth, the pattern of invasion, and the presence of necrosis, and thereby divide endometrial endometrioid carcinomas into low- and high-grade tumors. We analyzed this system for predicting the prognosis, with respect to inter- and intraobserver reproducibility and treatment modalities. Methods: A total of 200 endometrial carcinomas, based on hysterectomy specimens, were graded according to the binary grading system, for comparison against The International Federation of Gynecology and Obstetrics (FIGO) system and nuclear grading. Results: Both inter- and intraobserver agreement using the binary grading system (ĸ = 0.57; percent agreement: 82% and ĸ = 0.62; 84%) were superior compared with the FIGO system (0.50; 60% and 0.62; 73%) and the nuclear grading (0.23; 49% and 0.43; 65%). Patients with early-stage low-grade tumors had a 98% rate for 5-year survival (5YS). Patients with early-stage high-grade tumors, and those with advanced-stage low-grade tumors, had respectively 86% to 87% rates for 5YS. But patients with advanced-stage high-grade tumors had a 49% rate for 5YS. In binary low-grade early-stage tumors, the patient outcome was better with no adjuvant therapy and chemotherapy, compared with other therapies. Conclusion: A binary grading system was superior to others in permitting greater reproducibility and predicting the prognosis of endometrial cancer patients.
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