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Plasma levels of 5-FU in the patients with different severities of adverse events at 40 h after the start of infusion. Plasma levels of 5-FU in patients with the severity of adverse events (grade <2 and ≥2) were compared at 40 h after the start of infusion. The plasma levels of 5-FU of grade <2 (n=2) and ≥2 (n=13) are expressed in box-and-whisker plots. 5-FU, 5-fluorouracil.
