Low-dose radiotherapy combined with chemoimmunotherapy yields superior survival outcomes compared with chemoimmunotherapy alone for patients with small cell lung cancer with liver metastasis: a retrospective study. - Zhang, Yu; Li, Wenpeng; Zhang, Wenwen; Xing, Shiyun; Zhou, Lei; Zhang, Mingxing; Shen, Fangqian; Ni, Qi; Li, Lie; Bai, Yuju; Zhou, Jianguo; Ma, Hu (BMC Cancer, 2025)