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. 2021 Oct 29;25(2):401–410. doi: 10.1007/s10120-021-01258-6

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© The Author(s) 2021

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — Overview of CRITICS study design including time-points of blood samples. ctDNA circulating tumor DNA, ECC epirubicin/cisplatin/capecitabine, EOC epirubicin/oxaliplatin/capecitabine, lab laboratory parameters (neutrophil count, hemoglobin, alkaline phosphatase and lactate dehydrogenase), TM tumor markers (CEA and CA 19-9). *Every month until 3 months after surgery, every 3 months until 1 year after surgery, 6 months until 5 years after surgery