breast tumor luminal A or B luminal A breast carcinoma Luminal A MEDGEN:770985 Luminal A subtype of breast carcinoma A biologic subset of breast carcinoma defined by high expression of genes characteristic of luminal epithelial cells, including estrogen receptor (ER), estrogen regulated protein LIV-1, and the transcription factors hepatocyte nuclear factor 3, HNF3A, XBP1, and GATA 3. This subtype of breast cancer is associated with a good prognosis. Luminal A estrogen receptor positive subtype of breast carcinoma Luminal A breast cancer Luminal A oestrogen receptor positive subtype of breast carcinoma MONDO:0021116 Luminal A breast carcinoma UMLS:C3642345 NCIT:C53554