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Expression levels of IL-9 in the plasma and tissue samples. (A) Plasma levels of IL-9 in the colon cancer patients and HDs. (B) Expression levels of IL-9 in the colon cancer tissues (tumor) and normal colon tissues (normal) were determined by reverse transcription-quantitative polymerase chain reaction. Relative expression was normalized against the level of β-actin mRNA for each sample. Each bar represents the mean ± standard error. IL, interleukin; HD, healthy donors.
