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. 2020 May 14;5(3):e000646. doi: 10.1136/esmoopen-2019-000646

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© Author (s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. Published by BMJ on behalf of the European Society for Medical Oncology.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, any changes made are indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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IDO1 expression levels after treatment. Shown are the Kaplan-Meier (A) PFS curve (p=0.76) and the (B) OS curve (p=0.007) for IDO1 expression levels after treatment. IDO1, indoleamine 2,3-dioxygenase 1; OS, overall survival; PFS, progression-free survival.