Figure 4.

Effects of different doses of 5-FU on TI and SI. The thymus and spleen were washed with phosphate-buffered saline and weighed. (A) TI was calculated according to the following formula: $\text{TI}=[\text{thymus\hspace{0.17em}weight\hspace{0.17em}}(\text{mg})/\text{body}\hspace{0.17em}\text{weight\hspace{0.17em}}(\text{g})]\times 100$. (B) SI was calculated according to the following formula: $\text{SI}=[\text{spleen\hspace{0.17em}weight\hspace{0.17em}}(\text{mg})/\text{body\hspace{0.17em}weight\hspace{0.17em}}(\text{g})]\times 100$. The results presented are the mean ± standard deviation (n=6). ^**P<0.01, compared with the NS group. 5-FU, 5-fluorouracil; TI, thymus index; SI, spleen index.