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Published in: Virchows Archiv 4/2018

01-10-2018 | Original Article

Small oral tongue cancers (≤ 4 cm in diameter) with clinically negative neck: from the 7th to the 8th edition of the American Joint Committee on Cancer

Authors: Alhadi Almangush, Antti A. Mäkitie, Laura K. Mäkinen, Joonas H. Kauppila, Matti Pukkila, Jaana Hagström, Jussi Laranne, Ylermi Soini, Luiz Paulo Kowalski, Reidar Grénman, Caj Haglund, Ricardo D. Coletta, Tuula Salo, Ilmo Leivo

Published in: Virchows Archiv | Issue 4/2018

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Abstract

One of the main changes in the 8th edition of the American Joint Committee on Cancer (AJCC) for staging of oral cancer is the inclusion of depth of invasion (DOI) in the T category. However, cancers in different oral subsites have variable behavior, with oral tongue squamous cell carcinoma (OTSCC) being the most aggressive one even at early stage. Thus, it is necessary to evaluate the performance of this new T category in homogenous cohort of early OTSCC. Therefore, we analyzed a large cohort of patients with a small (≤ 4 cm) OTSCC to demonstrate the differences in T stage between the AJCC 7th and 8th editions. A total of 311 early-stage cases (AJCC 7th) of OTSCC were analyzed. We used 5 mm and 10 mm DOI for upstaging from T1 to T2 and from T2 to T3 respectively, as in the AJCC 8th. We further reclassified the cases according to our own proposal suggesting 2 mm to upstage to T2 and 4 mm to upstage to T3. According to AJCC 7th, there were no significant differences in the survival analysis. When we applied the 8th edition, many cases were upstaged to T3 and thus associated with worse disease-specific survival (HR 2.37, 95% CI 1.12–4.99) and disease-free survival (HR 2.12, 95% CI 1.09–4.08). Based on our proposal, T3 cases were associated with even worse disease-specific survival (HR 4.19, 95% CI 2.27–7.74). The 8th edition provides better survival prediction for OTSCC than the 7th and can be further optimized by lowering the DOI cutoffs.
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Metadata
Title
Small oral tongue cancers (≤ 4 cm in diameter) with clinically negative neck: from the 7th to the 8th edition of the American Joint Committee on Cancer
Authors
Alhadi Almangush
Antti A. Mäkitie
Laura K. Mäkinen
Joonas H. Kauppila
Matti Pukkila
Jaana Hagström
Jussi Laranne
Ylermi Soini
Luiz Paulo Kowalski
Reidar Grénman
Caj Haglund
Ricardo D. Coletta
Tuula Salo
Ilmo Leivo
Publication date
01-10-2018
Publisher
Springer Berlin Heidelberg
Published in
Virchows Archiv / Issue 4/2018
Print ISSN: 0945-6317
Electronic ISSN: 1432-2307
DOI
https://doi.org/10.1007/s00428-018-2417-y

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