A proposal to revise the histopathologic grading system of early oral tongue cancer incorporating tumor budding
Elseragy, Amr; Salo, Tuula; Coletta, Ricardo D.; Kowalski, Luiz Paulo; Haglund, Caj; Nieminen, Pentti; Mäkitie, Antti A.; Leivo, Ilmo; Almangush, Alhadi (2019-05-01)
Elseragy, A., Salo, T., Coletta, R., Kowalski, L., Haglund, C., Nieminen, P., Mäkitie, A., Leivo, I., Almangush, A. (2019) A Proposal to Revise the Histopathologic Grading System of Early Oral Tongue Cancer Incorporating Tumor Budding. 43 (5), 703-709. doi:10.1097/PAS.0000000000001241
© 2019 Wolters Kluwer Health, Inc. All rights reserved. This is the peer reviewed version of the following article: Elseragy, A., Salo, T., Coletta, R., Kowalski, L., Haglund, C., Nieminen, P., Mäkitie, A., Leivo, I., Almangush, A. (2019) A Proposal to Revise the Histopathologic Grading System of Early Oral Tongue Cancer Incorporating Tumor Budding. 43 (5), 703-709, which has been published in final form at http://dx.doi.org/10.1097/PAS.0000000000001241.
The World Health Organization (WHO) grading system has a low prognostic value for early-stage oral tongue squamous cell carcinoma (OTSCC); greater prognostic power has been shown with tumor budding analysis. In this study, we combined tumor budding analysis with histopathologic grading according to WHO 2017. In our proposal, a revised Grade I tumor is defined as a “well differentiated cohesive tumor”; revised Grade II as a “moderately differentiated and/or slightly dissociated tumor”; and revised Grade III as a “poorly differentiated and/or dissociated tumor”. We evaluated the prognostic value of this proposed grading system in a multicenter cohort of 311 cases of early OTSCC. The proposed grading system showed significant prognostic value in multivariable analysis for disease-specific survival (DSS) with a hazard ratio (HR) of 3.86 and a 95% confidence interval (CI) of 1.36 to 10.9 (P = 0.001). For disease-free survival (DFS), the proposed grading system showed good predictive power in multivariable analysis (HR 2.07, 95% CI 1.00–4.27; P = 0.009). The conventional WHO grading system showed a low prognostic value for DSS and DFS (P > 0.05). In conclusion, the prognostic power of the WHO histopathologic grading improved significantly with incorporation of tumor budding. Our proposed grading system can be easily included in pathology reports.
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