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. 2021 Jul 24;28(6):1225–1234. doi: 10.1007/s12282-021-01250-z

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© The Author(s) 2021

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Fig. 1 — The details of the cohorts. The Tohoku University cohort comprises 40 patients, 34 of whom were included in the analysis. The validation cohort comprised 220 patients who underwent surgery. Out of the 220 patients, 31 were excluded based on the exclusion criteria (stage and histological type) or due to inadequate specimens. The remaining189 patients were included in the analysis. FF fresh frozen, FFPE formalin-fixed paraffin-embedded