Metastases from a lobular carcinoma of the breast were based on negativity for Estrogen and Progesteron receptors (ER, PgR) and also negativity for mammaglobin, endothelial transcription factor 3 (GATA 3), and gross cystic disease fluid protein 15 (GCDFP-15). This evidence concerns the gene PIP and breast lobular carcinoma.