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. 2022 May 13;12:865404. doi: 10.3389/fonc.2022.865404

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Copyright © 2022 Shi, Han, Yan, Lv, Yuan, Li, Guan, Wang, Huang and Dai

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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Progression-free survival (left) and overall survival (right) in the patients without progression within 4 months during NPS chemotherapy who received or not received S-1 maintenance therapy, estimated using the Kaplan-Meier method.