**5. Conclusion**

Breast cancer is the most leading cause of cancer death in females worldwide. Although its name is based on a single tissue of origin, this cancer is heterogeneous making it a complex disease. Compared to other subtypes of breast cancer, TNBC is more biologically aggressive and has higher recurrence rate, higher frequency of metastasis and worse survival. Challenges into identifying targets and treatments have led to advances in laboratory technology and research resulting into the expansion of our knowledge of tumor biology. Though no specific therapies currently exist for TNBC except for cytotoxic chemotherapy, there is ongoing research to identify potential targets for therapy. Therefore, the understanding of breast cancer subtypes and targeted drug therapies is a key to address resistance to current targeted drugs in order to pave the way for providing personalized breast cancer care.
