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Maspin mRNA expression in sentinel lymph nodes predicts non‐SLN metastasis in breast cancer patients with SLN metastasis

Maspin is known to be a tumour suppressor protein, but its prognostic significance in breast cancer patients is controversial. There is no report focusing on maspin expression in metastatic carcinoma of sentinel lymph nodes (SLNs); we thus investigated maspin mRNA expression in SLNs using the remaining specimens after the one‐step nucleic acid amplification (OSNA) assay.