Proton stereotactic centralized ablative radiation therapy for treating bulky tumor: a treatment plan study - Li, Tengxiang; Yao, Xinsen; He, Ruimin; Xue, Xian; Wang, Shuai; Chen, Jinhu; Qiu, Qingtao; Yin, Yong; Tang, Quan (Frontiers in Oncology, 2025)