Luminal tumor cells look the most like cells of breast cancers that start in the inner (luminal) cells lining the mammary ducts. Luminal A tumors tend to be: Estrogen receptor-positive (ER-positive). Tumor grade 1 or 2. Luminal A breast cancer is hormone-receptor positive (estrogen-receptor and/or progesterone-receptor positive), HER2 negative, and has low levels of the protein Ki-67, which helps control how fast cancer cells grow. Luminal A cancers are low-grade, tend to grow slowly and have the best prognosis. Human Mammary Cells. The majority of breast cancers originate in the lobular or ductal cells of the milk-producing glands. In these structures, there are two main cell types: the inner luminal cells surrounded by basal myoepithelium.
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Journal of Cancer Biology and Clinical Oncology 