Immunohistochemical testing confirmed a mix of squamous cell carcinoma, invasive ductal carcinoma, and sarcoma, showing Ki-67(+30%), ER (-), PR (-), HER2 (invasive ductal carcinoma 2+), E-cadherin(invasive ductal carcinoma+), cytokeratin (CK) 5/6(squamous carcinoma+), P40(squamous carcinoma+), cytokeratin (CK) 7(invasive ductal carcinoma+), pan-cytokeratin (CK-pan) (carcinoma+), vimentin(sarcoma+), smooth muscle actin (SMA) (sarcoma focal+). The gene discussed is ERBB2; the disease is invasive ductal breast carcinoma.