The efficacy and safety of apatinib in patients with heavily pretreated end-stage cancer: a retrospective study - Li, Zhenyu; Zhou, Xiaoshu; Wang, Shuai; Shi, Liangliang; Meng, Rui; Dai, Xiaofang; Liu, Yi; Lin, Xueke; Xiao, Yong; Peng, Gang (Translational Cancer Research, 2023)