Neoadjuvant immunotherapy for DNA mismatch repair proficient/microsatellite stable non-metastatic rectal cancer: a systematic review and meta-analysis - Zhang, Huan; Huang, Jing; Xu, Huanji; Yin, Nanhao; Zhou, Liyan; Xue, Jianxin; Ren, Min (Frontiers in Immunology, 2025)