ECE2020 Audio ePoster Presentations Thyroid (144 abstracts)
TNM 8th edition in thyroid cancer staging: Is there an improvement in predicting recurrence?
Miriam Cellini 1,2 , Olimpia Alice Manzardo 1 , Rita Indirli 3 , Alessia Dolci 3 , Paolo Colombo 1 , Flaminia Carrone 1 , Elisabetta Lavezzi 1 , Giovanna Mantovani 3 , Gherardo Mazziotti 1,4 , Maura Arosio 3 & Andrea Lania 1,4
1Humanitas Clinical and Research Center, Endocrinology, Diabetology and Andrology Unit, Rozzano (MI), Italy; 2 ‘Sapienza’ University of Rome, Department of Medical-Surgical Sciences and Biotechnologies, Latina, Italy; 3Department of Clinical Sciences and Community Health, University of Milan; Endocrinology Unit, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milan, Italy; 4Humanitas University, Department of Biomedical Sciences, Milan, Italy
TNM 8th edition introduces changes in the staging of patients with differentiated thyroid carcinoma (DTC). This study aims at assessing the ability of TNM 8th edition in predicting structural recurrence of DTC.480 DTC patients were retrospectively evaluated by 7th and 8th editions of TNM staging systems in relationship with risk stratification, response to therapy and recurrence of disease as defined by 2015 American Thyroid Association (ATA) guidelines. As compared to the 7th edition, TNM 8 led to downstage 136 patients (28.3%), with 97.5% of patients falling into lower stages (I-II) and only 2.5% remaining in higher stages (III-IV) (P < 0.001). Patients who were downstaged in stages I-II by TNM 8 were classified more frequently at intermediate-high risk (P < 0.001), had more frequently structural incomplete response to therapy (P = 0.009) and had higher risk of structural recurrence (P = 0.002) as compared to patients who were in the same TNM stages but were not downstaged. Specifically, the risk of structural recurrence was significantly high in patients in whom the downstaging was induced by changes in tumour classification [Hazard ration (HR) 6.18, C.I. 95% 2.20–17.40; P = 0.001] but not in those who were downstaged for the increase in age cut-off (HR 2.80, C.I. 95% 0.86–9.19; P = 0.09). In conclusion, TNM 8th edition did not show reliability in predicting aggressiveness of DTC. In fact, the downstaging of DTC patients especially when performed due to changes in tumour classification may overlook patients predisposed to structural recurrences, potentially causing uncertainty in the therapeutic decision-making at the time of disease’s diagnosis.
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Endocrine Abstracts
ISSN 1470-3947 (print) | ISSN 1479-6848 (online)
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