Histology revealed a G2 invasive lobular carcinoma with lymph node metastasis, stage pT1cN3 (21/24 nodes), with positive staining for oestrogen receptor (ER 90%) and progesterone receptor (PgR 80%), a very low proliferation index (Ki67 < 10%), and without amplification of HER2-neu, suggesting a luminal A phenotype. The gene discussed is PGR; the disease is invasive lobular breast carcinoma.