Rad21 expression was analyzed in paraffin sections using rabbit anti‐Rad21 antibodies (1:200 dilution, Abcam) and an immunohistochemistry assay kit (Origene). Positive immunostaining of Rad21 appeared as a brown or tan color in the nucleus or cytoplasm of cancer cells. According to the proportion of positive cells and staining intensity, the expression level was scored. Expression was considered negative when the total score was 0‐2 and positive when the total score was more than 2.
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