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. 2021 Mar 11;11:628807. doi: 10.3389/fonc.2021.628807

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Copyright © 2021 Lee, Lee, Cho, Yoon, Kim, Park, Kim and Ko

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Differences in survival according to the classification of Chapuy et al. (9). Kaplan-Meier curves shows the difference in survival rate according to each class for (A) progression free survival and (B) overall survival. C1 and C4 were reported to have good prognosis and C3 and C5 were reported to have poor prognosis. This trend was also seen in our data on (C) progression free survival and (D) overall survival.