ERRFI1 expression was significantly associated (p < 0.05) with T follicular helper cells, natural killer T cells, Memory B cells, macrophages, immature B cells, eosinophils, CD56dim natural killer cell, CD56brght natural killer cells, activated dendritic cells, and Activated CD8 T cells in OSA samples. The gene discussed is CD8A; the disease is obstructive sleep apnea syndrome.