Significant correlations were found between levels of ERα and FOXA1 (ρ = 0.268; P = 0.018; Spearman's rho), ERα and GATA3 (ρ = 0.549; P < 0.001; Spearman's rho), and GATA3 and FOXA1 (ρ = 0.707; P < 0.001; Spearman's rho) in the primary breast tumors and in the metastatic setting (ρ = 0.349, P < 0.001; ρ = 0.459, P < 0.001; ρ = 0.535, P < 0.001, respectively; Spearman's rho). Here, ESR1 is linked to breast neoplasm.