Comparison of expression of CD107a, IFN-γ and TNF-α and CFSE dilution degree between patients and healthy group. Expression of CD107a, IFN-γ and TNF-α, and CFSE dilution degree after CD8+ T lymphocytes stimulated and not stimulated by CEF peptide in vitro at different time points (CD107a: 3 h; IFN-γ and TNF-α: 24 h; CFSE dilution degree: 5d). Data is presented as mean ± SD. One-tailed t-test is used for analysis; ** p < 0.01; *p < 0.05. CD107a: cluster of differentiation 107a; CFSE: carboxyl fluorescein diacetate succinimidyl ester; IFN: Interferon; TNF: tumor necrosis factor.