Pathological complete response to immune checkpoint inhibitor in patients with colorectal cancer liver metastases harboring POLE exonuclease domain mutation ============================================================================================================================================================ * Lei Wen * Zhigang Chen * Xiaomeng Ji * William Pat Fong * Qiong Shao * Chao Ren * Yanyu Cai * Binkui Li * Yunfei Yuan * Deshen Wang * Yuhong Li