CD4 and chronic rhinosinusitis with nasal polyps: In patients with CRSwNP, no significant differences in the expression of Ki-67 were observed between tissue CD4+ (14.01 ± 8.32% vs. 9.75 ± 10.08%) or CD8+ T cells (23.63 ± 16.02% vs. 15.77 ± 11.57%) and peripheral blood CD4+ and CD8+ T cells, respectively (Figure 1c,d).