Efficacy and safety of programmed cell death protein 1/programmed death-ligand 1 inhibitors combined with chemotherapy for breast cancer: a systematic review and meta-analysis - Xiao, Geqiong; Bi, Chenchen; Cai, Zhidong; Yan, Junwei; Lv, Tingting; Wang, Xiang; Ding, Haigang; Ding, Zhinan; Xuan, Yuying; Chen, Junxia; Liu, Zheng (Translational Cancer Research, 2026)