Fig. 3.

Relationship between CD4⁺ forkhead box P3 (FoxP3)⁺/CD4⁺, FoxP3⁺/CD8⁺ or FoxP3⁺/CD25⁺FoxP3⁻ and histological type. Comparisons of the means of (a) CD4⁺FoxP3⁺/CD4⁺ proportion, (b) FoxP3⁺/CD8⁺ and (c) FoxP3⁺/CD25⁺FoxP3⁻ ratios among the histological types and non-malignant nasopharyngeal (NP) tissues were performed by Mann–Whitney U-test. The differences without statistical significance are not indicated.