Histology revealed a 0.8 cm invasive ductal carcinoma of the right breast (T1bN0), estrogen positive, progesterone positive, and HER2 negative, and a 1.5 cm invasive ductal carcinoma of the left breast (T1cN0), estrogen positive, progesterone positive, and HER2 negative. This evidence concerns the gene ERBB2 and invasive ductal breast carcinoma.