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. 2019 May 9;8(5):428. doi: 10.3390/cells8050428

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© 2019 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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Kaplan-Meier plots for 5-year overall survival (OS) and relapse-free survival (RFS) stratified by statistically significant factors in the multivariate regression analysis: Serum concentration of methionine and overall survival (OS) (a), palliative treatment and OS (b), serum concentration of methionine and relapse-free survival (RFS) (c), oral cavity location and RFS (d), oropharyngeal location and RFS (e) and primary radio(chemo)therapy treatment and RFS (f). Data for statistically insignificant factors in the multivariable model are not shown.