Statistical analysis
death
REGRESSION, RECURRENT DISEASE
DFS was defined as the length of time from the date of vaccination to any recurrent disease or death, whichever occurred first. OS was defined as the length of time from the date of vaccination to death from any cause. Survival curves were estimated using the Kaplan–Meier method and compared using log-rank tests. Univariate and multivariate analyses were performed using the Cox proportional hazards regression model. The Wilcoxon rank-sum test, Fisher’s exact test, and chi-square test were used to investigate the relationships among various clinical and biological parameters. 