MKI67 and nasopharyngeal carcinoma: Previous researches have reported elevated Treg levels in the peripheral blood of NPC patients compared to healthy individuals, and an increase in tumor-infiltrating Tregs, suggesting a connection between these two compartments.35,36 In this study, we revealed a positive correlation between the frequency of peripheral Ki67+ Tregs and the frequency of intratumoral Ki67+ Treg population.