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Thymic Epithelial Tumors: Prognostic Significance and Relationship between Histology and the New TNM Staging System.
Thoracic and Cardiovascular Surgeon 2019 Februrary 23
BACKGROUND: This study aims to describe the relationship between the new tumor nodes metastasis (TNM) staging and World Health Organization (WHO) classification and to identify how these two variables relate to each other and whether they possess a prognostic value in predicting survival and recurrence of disease.
METHODS: Medical records of 54 patients who underwent surgery for thymic epithelial tumors between 1996 and 2015 were reviewed.The histologic type of neoplasm was classified according to the criteria of WHO and staging was evaluated using the new TNM classification system.
RESULTS: A significant correlation between the TNM stages and the histological classification was found ( p < 0.001). Complete resection is related to both TNM stage and histological grading ( p < 0.001). Evaluation of the 5- and 10-year survival curves shows how these are significantly correlated only at the stage ( p = 0.03 and = 0.04, respectively). The risk of death at 5 and 10 years for stages III to IV is six and three times higher than in stages I to II, respectively. Regarding the disease-free survival, there is significant correlation with both staging and histology ( p = 0.001 and = 0.02, respectively).
CONCLUSIONS: There is a significant correlation between the new TNM staging and the histological grade WHO. The ability to implement a complete resection, the overall and disease-free survival is closely related to the thymoma stage. Furthermore, both histotype and stage correlate with disease-free survival. In fact, the least aggressive stages, both WHO and TNM, have a free time out of disease superior to advanced stages.
METHODS: Medical records of 54 patients who underwent surgery for thymic epithelial tumors between 1996 and 2015 were reviewed.The histologic type of neoplasm was classified according to the criteria of WHO and staging was evaluated using the new TNM classification system.
RESULTS: A significant correlation between the TNM stages and the histological classification was found ( p < 0.001). Complete resection is related to both TNM stage and histological grading ( p < 0.001). Evaluation of the 5- and 10-year survival curves shows how these are significantly correlated only at the stage ( p = 0.03 and = 0.04, respectively). The risk of death at 5 and 10 years for stages III to IV is six and three times higher than in stages I to II, respectively. Regarding the disease-free survival, there is significant correlation with both staging and histology ( p = 0.001 and = 0.02, respectively).
CONCLUSIONS: There is a significant correlation between the new TNM staging and the histological grade WHO. The ability to implement a complete resection, the overall and disease-free survival is closely related to the thymoma stage. Furthermore, both histotype and stage correlate with disease-free survival. In fact, the least aggressive stages, both WHO and TNM, have a free time out of disease superior to advanced stages.
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