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Experimental validation of 9‐gene prognostic signature in BRCA and paracancerous tissues by RT‐PCR. The result indicated that the protective prognostic factors in BRCA patients were significantly downregulated, whereas the dangerous prognostic factors were upregulated. p value < 0.05 (t test) was considered statistically significant. *p < 0.05; **p < 0.01; ***p < 0.001；****p < 0.0001.
