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Correlation between immunological variables at baseline and progression-free survival (PFS). The percentage of circulating total lymphocytes (A), CD8+ cytotoxic T cells (B), and CD19+ B cells (C) significantly positively correlated with PFS. The serum concentration of interleukin (IL)-2 (D) showed a significant negative correlation with PFS. Correlation studies were performed using the Spearman’s rho rank correlation test.
