In the control group, the induction of mammary cancer by DMBA resulted in about 30% luminal A, 10% luminal B, 60% HER2-enriched and no cases of triple-negative tumors (TNBC), classified solely on the base of the levels of expression of ER, PR, HER2 and PCNA (Figure 6). Here, ERBB2 is linked to breast cancer.