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Distribution of percent of inhibition index of 23 cholangiocarcinoma tissues to 200 μg/mL 5-fluorouracil. Sensitivities of 23 cholangiocarcinoma (CCA) tissues to 5-fluorouracil (5-FU) were evaluated at 200 μg/mL 5-FU using histoculture drug response assay (HDRA). The median value of % I.I. (36.5%) was selected as the cut-off for classifying these tissues as responders and non-responders. Each circle represents one CCA sample. The median is shown by the long, thin horizontal line.
