Certain therapies that have proven effective in treating some types of breast cancers are ineffective for women diagnosed with triple-negative breast cancer (TNBC). In fact, there is limited targeted drug therapy for this type of breast cancer—the most aggressive type, diagnosed in about 20 percent of breast cancer patients.
source https://www.lifetechnology.com/blogs/life-technology-news-blog/zhang-group-identifies-gene-that-may-make-tnbc-cells-vulnerable-to-existing