Final histopathology revealed a 9-mm, grade 2, oestrogen receptor-positive, progesterone receptor-negative (ER8, PR0), Her2-negative invasive ductal carcinoma in the right upper outer quadrant, and 4/6 positive lymph nodes (CK7+/CK20−, AE1/AE3+; T1b N2 M0). This evidence concerns the gene PGR and invasive ductal breast carcinoma.