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<正>Objective To investigate the role of mast cells and interleukin-9 (IL-9) in B-cell non-Hodgkin lymphoma (B-NHL) development and its clinical significance.Methods The expression level of CD117 in tumor tissues of 32 B-NHL patients was determined by Western blot.The infiltration of CD117+mast cells (MCs) in human B-NHL tumor tissues was observed by immunohistochemistry staining.To evaluate the correlations between the data from CD117+MCs and biological markers of human B-NHL,a Spearman correlation coefficient (rs) was cal-