This observation is consistent with the TCGA proteomic breast cancer data in which, despite the difference in total EGFR mRNA levels between basal and luminal cases, levels of phosphorylated EGFR between basal and luminal subtypes were similar (26% of basal and 24% of luminal case with p-EGFR protein z-scores > 1) [37]. Here, EGFR is linked to breast cancer.