Efficacy and safety of low-dose everolimus combined with endocrine drugs for patients with hormone receptor-positive, human epidermal growth factor receptor 2-negative metastatic breast cancer

Hui-Qiang Zhang, Jin-Mei Zhou, Shao-Hua Zhang, Li Bian, Jin-Yi Xiao, Xiao-Peng Hao, Ze-Fei Jiang, Tao Wang