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Effects of PPD on (A) spleen index and (B) splenocyte proliferation in CTX-treated tumor-bearing mice. Data are expressed as the mean ± SD (n=10). Statistical significances were determined using ANOVA, followed by Student-Newman-Keuls tests. **P<0.01 compared with the control group; #P<0.05 compared with the CTX group. PPD, 20(S)-protopanaxadiol; CTX, cyclophosphamide; ANOVA, analysis of variance.
