All statistical analyses were performed using R (version 4.0), and relevant packages were applied for processing and visualization. The Wilcoxon test was used to compare differences in continuous variables. The overall survival was evaluated using the Kaplan–Meier analysis, and the survival curve was plotted using the R package “survminer” (http://cran.r-project.org/). The log-rank test was used to examine the differences between subtypes or groups. If not specifically stated, bilateral p < 0.05 was considered statistically significant.
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