Mar 13, 2019 · Triple-Negative Breast Cancer. Testing negative for all three means the cancer is triple-negative. These negative results mean that the growth of the cancer is not supported by the hormones estrogen and progesterone, nor by the presence of too many HER2 receptors. Therefore, triple-negative breast cancer does not respond to hormonal therapy. A diagnosis of triple negative breast cancer means that the three most common types of receptors known to fuel most breast cancer growth–estrogen, progesterone, and the HER-2/neu gene– are not present in the cancer tumor. This means that the breast cancer cells have tested negative for hormone epidermal growth.
Triple-negative breast cancer is a kind of breast cancer that does not have any of the receptors that are commonly found in breast cancer. Think of cancer cells as a house. One is for the female hormone estrogen. One is for the female hormone progesterone. One is a .