ERBB2 and cancer: When a specific population with low expression levels of MYC and STAT3 appears to be the counterpart of cancer subtypes, such as, ERBB2+, we observed that PDGFRB_STP co-expressed with aberrantly expressed MYC and STAT3 in two tumor subtypes, luminal A and luminal B (p-values ≤ 0.001 in Figure 7A left panel).