Student’s t-tests and Fisher’s exact tests were used to analyze the continuous and categorical variables between PBAC and non-PBAC patients, respectively. Five-year DFS and OS were analyzed using the Kaplan–Meier method and compared between PBAC and non-PBAC patients using log-rank tests. The Cox proportional hazard regression model was used for multivariate analysis. A p value <0.05 was considered statistically significant. This study was approved by the Institutional Review Board at Kanagawa Cancer Center and was performed in accordance with the Declaration of Helsinki.
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