About 15 to 20 percent of breast cancers are triple-negative. The The Rose Breast Cancer Awareness Shirt! Because the tumors are negative to the three most common receptors, TNBC can’t be treated with medicines that slow or stop cancer growth by targeting these receptors, and instead are treated with standard chemotherapy & radiotherapy. Without these targeted treatment options, TNBC patients have a higher risk of recurrence. TNBC can also metastasize to other organs in the body like the liver, lungs, brain or bones & when it does, it is not curable.