Basal-like phenotype is not associated with patient survival in estrogen-receptor-negative breast cancers.

Although the signal for the basal phenotype among ER-negative tumors was weaker than in the whole data set, in which the classification may have been highly influenced by the strong ER-related signal, it was statistically highly significant (1,713 genes were identified with p < 0.05; see Additional file 2 for the top 200 genes).

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