In the tumor group, IGF-1 and IGF-2 levels were strongly correlated with ERα expression (r = 0.6439 for IGF-1, r = 0.5228 for IGF-2), and were weakly correlated with ERβ expression (r = 0.4155 for IGF-1, r = 0.3555 for IGF-2). This evidence concerns the gene ESR2 and neoplasm.