ERBB2 and breast cancer: Results indicated that women with microcalcification clusters in the affected breast were more likely to have a HER‐2 subtype breast cancer OR 1.78 (95% CI 1.24‐2.54) and possibly had a reduced probability of basal subtype OR 0.54 (95% CI 0.30‐0.96) compared to Luminal A subtype (Table 2).