Prognostic significance of the inhibitory-to-stimulatory immune checkpoint ratio in patients with breast cancer - Tang, Chuangang; Hu, Xiang; Hao, Dawei; Chen, Tao; Wang, Pei; Li, Changwen; Chen, Chengling; Li, Yongcheng; Hao, Xiaowen; Yuan, Zeng (Frontiers in Oncology, 2025)