2.1 Patients
The Ethics Committee of Children’s Hospital Affiliated with Chongqing Medical University approved this retrospective study and waived the need for informed patient consent. 29 patients with CCSK diagnosed from January 2013 through February 2021 were enrolled. Considering the imbalance ratio between CCSK and Wilms’ tumor, 66 patients with Wilms’ tumor diagnosed consecutively were selected as control group, and then 51 patients were finally enrolled according to the including and excluding criterions. Workflow of patient enrollment for this retrospective case-control study was demonstrated inSupplementary Fig. 1 . The patients’ cohort (n=80) was randomly separated into the training set (n=63) and validation set (n=17) at the ratio of 8:2, and the random seeds is 138.