The present invention relates to a composition for determining subtypes of triple-negative
breast cancer and a composition for preventing or treating triple-negative
breast cancer. By measuring the expression level of DNp63α, which is a biomarker identified in the present invention, the molecular subtypes of triple-negative
breast cancer can be accurately classified. Based on the classified molecular subtypes, the therapeutic responsiveness to specific therapeutic agents is predicted with high reliability, thereby significantly contributing to early establishment of treatment strategies and improved
patient survival. In addition, the composition of the present invention significantly induces
apoptosis of
cancer cells by inhibiting the expression of DNp63α in triple-negative breast
cancer expressing DNp63α, and thus can be effectively used as an efficient therapeutic composition for triple-negative breast
cancer, which is
refractory solid cancer.