Statistical analysis
The chi-square test was used to compare the counting data of the two groups, the Kaplan‒Meier method was used to generate a survival curve, and the log-rank test was used to compare the difference in PFS and OS between the two groups. We used SPSS software (version 25.0) to perform all the statistical analyses. All statistical tests were bilateral tests, and p < 0.05 was statistically significant. This study was registered at the Chinese Clinical Trial Registry (chictr.org.cn), registration number: ChiCTR1900022129.