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Expression levels of miR-452 in breast cancer tissues assessed by reverse transcription-quantitative polymerase chain reaction. (A) miR-452 was downregulated in breast cancer tissue, compared with paired adjacent normal tissue. *P<0.05 vs. normal tissues. (B) miR-452 levels in breast cancer with metastasis were significantly lower than in those without metastasis. Data are presented as the mean ± standard deviation. *P<0.05 vs. no metastasis. miR-452, microRNA-452.
