Consistent with this observation, MAGI1 expression positively correlates with ESR1 (the gene coding for ER) and luminal fate transcription factors GATA3 and FOXA1 expression within ER+/HER2− breast cancers in both data sets (Figure 1b, significant correlations are in blue, anti-correlations are in red). This evidence concerns the gene ERBB2 and breast cancer.