Fig. 1
From: Novel models by machine learning to predict prognosis of breast cancer brain metastases
The flowchart described the process of conducting the study and statistical analysis. SEER the surveillance, epidemiology, and end results database; BCBM breast cancer brain metastases, PSM propensity score matching, COX concordance index; ROC curve receiver operating characteristic curve, AUC area under the curve, K–M Kaplan–Meier, XGBoost extreme gradient boosting