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Evaluation of AJCC staging system and proposal of a novel stage grouping system in retroperitoneal liposarcoma: the
Peidang Fan1,2, Ping Tao3, Zhenyu Wang4
1Department of General Surgery, Zhongshan Hospital, Fudan University, Shanghai, China.
A new TNM (nTNM) staging system improves risk stratification for retroperitoneal liposarcoma (RPLS) patients, outperforming current AJCC systems. This enhanced staging aids in personalized treatment and better prediction of overall survival (OS).
Area of Science:
- Oncology
- Surgical Pathology
- Cancer Staging
Background:
- Overall survival (OS) in retroperitoneal liposarcoma (RPLS) shows significant individual variation, even within the same clinical stage.
- Current staging systems, including the 8th edition of the American Joint Committee on Cancer (AJCC) TNM, have shown disappointing external validation results.
- There is a critical unmet need for improved staging of RPLS to better predict patient outcomes.
Purpose of the Study:
- To evaluate and compare the prognostic accuracy of existing TNM staging systems (7th and 8th AJCC editions) with a newly developed TNM (nTNM) staging system for RPLS.
- To assess the performance of the FNCLCC stage and develop a nomogram for individualized prognostic analysis in RPLS patients.
Main Methods:
- A retrospective cohort study included 220 patients with primary RPLS from a Chinese sarcoma center and 277 from the SEER database.
- Patients were restaged using the 7th AJCC TNM, 8th AJCC TNM, and the new TNM (nTNM) systems.
- Overall survival (OS) was the primary endpoint, analyzed using Kaplan-Meier and log-rank tests. Nomogram performance was evaluated using C-index, AUC, and calibration curves.
Main Results:
- The nTNM staging system demonstrated improved risk stratification compared to both the 7th and 8th AJCC TNM systems.
- The FNCLCC stage showed high prognostic value, highlighting histological grade as a crucial factor for predicting RPLS patient survival.
- A constructed nomogram model showed a high degree of agreement between predicted and actual OS rates.
Conclusions:
- The revised T-stage and nTNM systems offer superior risk stratification for RPLS compared to current AJCC TNM staging.
- The FNCLCC stage is highly prognostic, underscoring the importance of histological grade in predicting RPLS patient survival.
- The developed nomogram facilitates individualized prognostic analysis and supports the development of risk-adapted therapies for RPLS.
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