Statistical analysis
All statistical methods were analyzed by R software 4.1.0 and SPSS 26.0. Continuous variables were described by mean and standard deviation, and a nonparametric U test was used to compare differences between groups. Categorical variables were described by frequency, and chi-square tests were used to compare group differences. The proportional sub-distribution hazard model analyzed the risk factors of CSM and OCM. The Log-rank test and Kaplan–Meier curve analyzed the survival difference between groups. A 