To determine whether a correlation exists between clinical parameters of the BCa patients and LOHs detected at the different microsatellite markers, we compared tumor size (T1, T2, T3/4), nuclear grade (G1, G2, G3), axillary lymph node status (positive/negative), estrogen receptor (positive/negative), progesterone receptor (positive/negative), the proliferation antigen Ki-67 (low ≤30%/high > 30%) and HER2 expression (positive/negative) with the occurrence of LOH in the different clinical samples. This evidence concerns the gene ERBB2 and neoplasm.