Dickkopf-related protein 1, a new biomarker for local immune status and poor prognosis among patients with colorectal liver Oligometastases: a retrospective study. - Sui, Qiaoqi; Zheng, Jian; Liu, Dingxin; Peng, Jianhong; Ou, Qingjian; Tang, Jinghua; Li, Yuan; Kong, Lingheng; Jiang, Wu; Xiao, Binyi; Chao, Xue; Pan, Zhizhong; et al. (BMC Cancer, 2019)