Immunohistochemical examination showed ER (40%+), PR (5%+), HER-2 (3+), Ki67 (40%), AR (70%+), CK5/6 (−), CK7 (++), E-cadherin (++), p63 (−), SOX-10 (−), GATA-3 (+), Mammaglobin (+), and Napsin A (−) of the breast tumor cells, and the carcinoma cells of the left cervical lymph node were ER (70%+), PR (20%+), HER-2 (3+), Ki67 (40%), GATA-3 (+), and CK7 (++). This evidence concerns the gene MKI67 and breast neoplasm.